JP2008139740A - Method and device for controlling display for dot matrix type liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for controlling display for a dot matrix LCD having no interference of display data and high visibility. <P>SOLUTION: The method includes: dividing the screen of a dot matrix LCD comprising a plurality of COM (common) signal lines and a plurality of SEG (segment) signal lines into a plurality of display areas; and performing control to display a display pattern such as characters and numbers in each display area. The screen is divided into display areas not to share the same COM signal line and is controlled to display a pattern such as characters and numbers by the COM signal lines and the SEG signal lines in each divided display area. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a display control method and a display control apparatus for a dot matrix type LCD (liquid crystal display).

  As shown in FIG. 11, the dot matrix type LCD is arranged so that COM (common) signal lines COM0 to COMn and SEG (segment) signal lines SEG1 to SEGn are orthogonal to each other, and the intersections are turned on or off as dots. Thus, display patterns such as letters and numbers can be expressed.

  In such a vehicle display device using a dot matrix type LCD, as shown in FIG. 12 as an example, display control is performed so that different vehicle information displays are switched by the switch operation in the same display area of the dot matrix type LCD screen. There is something to do. For example, as shown in FIG. 12, the outside air temperature (information for arbitrary display) is displayed (FIG. 12 (A)), or the odometer / trip meter (information for essential display) is displayed (FIG. 12 (B)). To do.

  Further, in a vehicle display device using a dot matrix type LCD, as shown in FIG. 13, a plurality of vehicle information such as outside temperature (arbitrary display information), A / T position (constant display) is displayed on the display screen. Information) and odometer / trip meter (mandatory display information) are divided into areas and are controlled to be displayed simultaneously.

  However, the display controlled as shown in FIG. 12 has a problem that visibility is poor because different vehicle information is switched and displayed in the same display area.

  In addition, the display controlled as shown in FIG. 13 cannot perform display data processing in a single display area because a plurality of display areas for displaying different vehicle information spans the same COM signal line. That is, the minimum unit of data transmission to the LCD controller that controls the display of the LCD is one line of the COM signal line. Therefore, if a plurality of areas extend over the same COM signal line, mutual interference between display areas occurs. This causes a problem that display data processing becomes difficult. For example, when displaying (updating) the A / T shift position screen, it is also necessary to generate an outside air temperature screen and an od / trip meter screen across the same COM signal line. Therefore, even if the A / T shift position screen data is generated, it cannot be displayed on the LCD screen unless the outside air temperature screen data and the od / trip meter screen data are generated.

  In view of the above problems, an object of the present invention is to provide a display control method and a display control device for a dot matrix type LCD with good visibility without mutual interference of display data.

  According to a first aspect of the present invention, there is provided a display control method for a dot matrix LCD according to claim 1, wherein the dot matrix LCD screen formed by a plurality of COM signal lines and a plurality of SEG signal lines has a plurality of screens. A display control method of a dot matrix type LCD which divides into display areas and controls each display area to display a display pattern such as characters and numbers, so that the screen does not share the same COM signal line The display area is divided into the respective display areas, and the display patterns such as the characters and numbers are controlled by the COM signal lines and the SEG signal lines of the divided display areas, respectively.

  In the first aspect of the invention, the screen of the dot matrix type LCD formed by a plurality of COM signal lines and a plurality of SEG signal lines is divided into a plurality of display areas, and characters, numbers, etc. A display control method for a dot matrix type LCD for controlling to display a display pattern, wherein the screen is divided into display areas so as not to share the same COM signal line, and the COM signal of each divided display area is displayed. Control is performed so that display patterns such as characters and numbers are displayed by the line and the SEG signal line, respectively. Accordingly, the plurality of display areas are divided along the COM signal line so as not to share the same COM signal line, and thus visibility is improved. Further, it becomes easy to generate and update display data in a single display area, and simple display control without mutual interference with other areas becomes possible. Further, since there is no mutual interference, it is possible to flexibly cope with specification changes such as addition or deletion of new areas.

  In order to solve the above problems, a display control device for a dot matrix LCD according to claim 2 of the present invention comprises a dot matrix LCD having a screen formed by a plurality of COM signal lines and a plurality of SEG signal lines; A screen data generating means for dividing the screen of the dot matrix type LCD into a plurality of display areas so as not to share the same COM signal line, and generating screen data to be displayed in each of the divided display areas; LCD driving means for supplying and driving the COM signal and SEG signal corresponding to the screen data generated by the data generating means to the COM signal line and the SEG signal line of the dot matrix type LCD. Features.

  According to the second aspect of the present invention, the dot matrix LCD having a screen formed by a plurality of COM signal lines and a plurality of SEG signal lines and the screen of the dot matrix LCD do not share the same COM signal line. Screen data generating means for generating screen data to be displayed in each of the divided display areas, and a COM signal and SEG signal corresponding to the screen data generated by the screen data generating means LCD driving means for supplying and driving the COM signal line and SEG signal line of the matrix type LCD. Accordingly, the plurality of display areas are divided along the COM signal line so as not to share the same COM signal line, and thus visibility is improved. Further, it becomes easy to generate and update display data in a single display area, and simple display control without mutual interference with other areas becomes possible. Further, since there is no mutual interference, it is possible to flexibly cope with specification changes such as addition or deletion of new areas.

  According to a third aspect of the present invention, there is provided the dot matrix type LCD display control device according to the second aspect, wherein the screen data generating means generates screen data to be displayed in each display area. Asynchronously generated, the generated screen data are combined, and the combined screen data is supplied to the LCD driving means.

  According to a third aspect of the present invention, the screen data generating means asynchronously generates screen data to be displayed in each display area, synthesizes the generated screen data, and supplies the combined screen data to the LCD driving means. As a result, even if the signal input timing and display update time differ for each display content, display data is generated separately (asynchronously) for each area, allowing simple display control without mutual interference with other areas. become.

  In order to solve the above-mentioned problem, the invention according to claim 4 is the dot matrix type LCD display control device according to claim 2, wherein the screen data generation means outputs the screen data to be displayed in each display area. Asynchronously generated, each generated screen data is asynchronously supplied to the LCD driving means.

  According to a fourth aspect of the present invention, the screen data generating means asynchronously generates screen data to be displayed in each display area, and supplies the generated screen data to the LCD driving means asynchronously. As a result, even if the signal input timing and display update time differ for each display content, display data is generated separately (asynchronously) for each area, allowing simple display control without mutual interference with other areas. become.

  In order to solve the above-mentioned problems, the invention according to claim 5 is the dot matrix type LCD display control device according to any one of claims 2 to 4, wherein the dot matrix type LCD is the first A first display area formed by the COM signal line group and the first SEG signal line group, and a second display area formed by the second COM signal line group and the second SEG signal line group. The screen data generation means divides the first and / or second display area into a plurality of display areas so as not to share the same COM signal line, and the first and / or second display area is divided. 2 and the screen data to be displayed in each of the divided display areas, and the LCD driving means generates the first display area generated by the screen data generating means. LCD drive for driving by supplying a COM signal and SEG signal corresponding to the screen data to be displayed on the first matrix to the first COM signal line group and the first SEG signal line group of the dot matrix type LCD And a COM signal and a SEG signal corresponding to the screen data to be displayed in the second display area generated by the screen data generating unit, and the second COM signal line group of the dot matrix type LCD and the And second LCD driving means for supplying and driving the second SEG signal line group.

  According to the fifth aspect of the present invention, the dot matrix type LCD includes a first display area formed by the first COM signal line group and the first SEG signal line group, the second COM signal line group, and the first COM signal line group. And the screen data generating means does not share the same COM signal line with the first and / or second display area. Are divided into a plurality of display areas, and the first and / or second display areas and the screen data to be displayed in each of the divided display areas are generated. The LCD driving means is a screen data generating means. The COM signal and SEG signal corresponding to the generated screen data to be displayed in the first display area are converted into the first COM signal line group and the first SEG signal label of the dot matrix type LCD. The first LCD driving means for supplying and driving to the screen group, and the COM signal and the SEG signal corresponding to the screen data to be displayed in the second display area generated by the screen data generating means are sent to the first of the dot matrix type LCD. And a second LCD driving means for supplying and driving the second COM signal line group and the second SEG signal line group. Thereby, even when different display areas are arranged in the COM signal line direction of the LCD, display control without mutual interference with other areas becomes possible.

  According to the first aspect of the present invention, the plurality of display areas are divided along the COM signal line so as not to share the same COM signal line, so that the visibility is improved. Further, it becomes easy to generate and update display data in a single display area, and simple display control without mutual interference with other areas becomes possible. Further, since there is no mutual interference, it is possible to flexibly cope with specification changes such as addition or deletion of new areas.

  According to the second aspect of the present invention, the plurality of display areas are divided so as not to share the same COM signal line along the COM signal line, so that the visibility is improved. Further, it becomes easy to generate and update display data in a single display area, and simple display control without mutual interference with other areas becomes possible. Further, since there is no mutual interference, it is possible to flexibly cope with specification changes such as addition or deletion of new areas.

  According to the third aspect of the present invention, even if the signal input timing and the display update time are different for each display content, the display data is generated separately (asynchronously) for each area. No simple display control is possible.

  According to the fourth aspect of the invention, even if the signal input timing and the display update time are different for each display content, the display data is generated separately (asynchronously) for each area. No simple display control is possible.

  According to the fifth aspect of the present invention, even when different display areas are arranged in the COM signal line direction of the LCD, display control without mutual interference with other areas becomes possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In the dot matrix type LCD display control method of the present invention, for example, in a dot matrix type LCD used in a vehicle display device for displaying vehicle information representing a vehicle state, a plurality of COM signal lines and a plurality of SEG signals are displayed. The LCD screen formed by lines is clearly divided into multiple display areas so as not to share the same COM signal line along the COM signal line, thereby improving the visibility of the user. It can be made to.

  In the present invention, for example, as shown in FIG. 1, the screen of a dot matrix LCD is divided into three display areas A, B, and C so as not to share the same COM signal line along the COM signal line. In area A, information of optional display such as fuel consumption, outside temperature, warning, etc. is displayed (here, outside temperature of 25.0 ° C is displayed). In area B, A / T position, vehicle height, etc. are always displayed. The display information is displayed (here, the A / T position of P (parking) is displayed), and the required display information such as an od / trip meter is displayed in the C area (here, 88888.88.8 km) The display is controlled so that the odd / trip meter is displayed.

  According to such a display control method, since a plurality of display areas for displaying different vehicle information do not extend on the same COM signal line, there is no mutual interference between the display areas, and display data in a single display area. Can be easily generated and updated.

  Specifically, display data for each divided area is generated separately (asynchronously) by the CPU based on the display content of the input vehicle information, and data is transmitted from the CPU to the LCD controller. As a transmission method, a method of combining display data of A, B, and C and transmitting them as one screen (CPU processing flow 1), and a method of transmitting only areas in A, B, and C that require display update. (CPU processing flow 2).

(CPU processing flow 1)
In the CPU processing flow 1 shown in FIG. 2, first, the CPU performs input processing and calculation of vehicle information to be displayed on the LCD, and then screen data for display on the A, B, and C area screens of the LCD. Are respectively generated asynchronously and separately, then the generated screen data are combined, and then the combined screen data is periodically transmitted to the LCD controller. The LCD controller supplies the COM signal and the SEG signal to the LCD based on the composite screen data transmitted from the CPU, and as shown in FIG. 1, the areas A and B are divided along the COM signal line of the LCD. And separate vehicle information is displayed in the C area.

(CPU processing flow 2)
In the CPU processing flow 2 shown in FIG. 3, first, the CPU performs input processing and calculation of vehicle information to be displayed on the LCD, and then screen data for display on the A, B, and C area screens of the LCD. Are separately generated asynchronously, and then the generated A area screen data, B area screen data and C area screen display data are each periodically transmitted to the LCD controller asynchronously. The LCD controller supplies a COM signal and an SEG signal corresponding to each screen data transmitted from the CPU to the LCD, and as shown in FIG. 1, area A and area B are divided along the COM signal line of the LCD. And separate vehicle information is displayed in the C area.

  Next, a description will be given of an embodiment in which a display control apparatus for implementing a display control method for a dot matrix LCD according to the present invention is applied to a vehicle meter.

  (First Embodiment) FIG. 4 is a block diagram showing an example of an electrical configuration of a vehicle meter to which a display control apparatus for carrying out a display control method for a dot matrix LCD according to the present invention is applied. In the first embodiment, the display control method based on the CPU processing flow 1 described above is employed.

  As shown in FIG. 4, the vehicle meter includes a microcomputer (hereinafter referred to as a CPU) 21, a power supply circuit 22 that supplies an appropriate power supply voltage Vcc to the CPU 21, and an on / off signal of an ignition switch (not shown) to the CPU 21. An interface (I / F) circuit 23 for inputting, an I / F circuit 24 for inputting an illumination control signal to the CPU 21, vehicle speed detection signals (vehicle speed pulse signals) from various sensors (not shown), engine rotation An I / F circuit 25 for inputting a number detection signal, a water temperature detection signal, a fuel detection signal, an outside air temperature detection signal, an A / T shift position signal, and various warning detection signals to the CPU 21 in a CAN data system via the in-vehicle LAN. Driven by trip knob switch 26, EEPROM 27 as external memory, and CPU 21 A speedometer movement 28 for instructing the running speed, a tachometer movement 29 for instructing the engine speed driven by the CPU 21, a water temperature movement 30 for instructing the water temperature driven by the CPU 21, and a fuel remaining amount driven by the CPU 21. The fuel gauge movement 31 to instruct, the I / F circuit 33 for supplying the lighting control signal output from the CPU 21 to the LEDs 36a to 36n for illumination, and the warning control signal output from the CPU 21 for warning that displays various warning states An I / F circuit 34 to be supplied to the LEDs 37a to 37n, an LCD controller 38 to which screen data generated by the CPU 21 is supplied, and an LCD 39 to which the COM signal and SEG signal are supplied from the LCD controller 38 and display vehicle information. I have. The CPU 21 corresponds to screen data generation means in the claims, and the LCD controller 38 corresponds to LCD drive means in the claims.

  The CPU 21 incorporates ROM and RAM as memories. The ROM stores software for generating A, B, and C area screens. The RAM stores A area screen data, B area screen data, and Storage areas for temporarily storing the C area screen data are secured. In each storage area, 0 and 1 data of each COM signal line and SEG signal line are stored.

  The EEPROM 27 stores data of a unit of 1 km or more for displaying the total travel distance of the odometer / trip meter. Data less than 1 km is temporarily stored in the RAM in the CPU 21.

  The LCD 39 is a dot matrix type LCD, and is arranged so that the COM signal line and the SEG signal line are orthogonal to each other, and can display a display pattern such as characters and numbers by turning on or off the intersection as a dot.

  Next, screen data generation processing executed by the CPU 21 of the vehicle meter having the above-described configuration will be described with reference to the flowchart of FIG.

  First, CAN data is fetched through the I / F circuit 25 (step S1), and then screen data (outside temperature data) to be displayed in the A area on the screen of the LCD 39 is generated (step S2).

  The processing in step S2 is performed by executing a subroutine shown in FIG. That is, as shown in FIG. 6, first, the outside air temperature data in the CAN data fetched in step S1 is read (step S21), and then the currently displayed outside air temperature data is read from the RAM (step S22).

  Next, it is determined whether or not to change the outside air temperature data (step S23). In this determination, if the outside air temperature data fetched this time is different from the currently displayed outside air temperature data that was previously taken and stored in the RAM, the outside air temperature data is changed (Y in step S23), and then The previous outside air temperature data stored in the RAM is changed (updated) to the outside air temperature data fetched this time (step S24), and then the process returns to the main routine of FIG. On the other hand, if the outside air temperature data captured this time is the same as the previous outside air temperature data, the outside air temperature data is not changed (N in step S23), and then the process returns to the main routine of FIG.

  Returning to FIG. 5, next, the screen data (A / T shift position data) to be displayed in the area B is generated (step S3).

  The process of step S3 is performed by executing a subroutine shown in FIG. That is, as shown in FIG. 7, first, the A / T shift position data in the CAN data fetched in step S1 is read (step S31), and then the A / T shift position data currently being displayed is read from the RAM (step S32). ).

  Next, it is determined whether or not the A / T shift position data is to be changed (step S33). In this determination, if the A / T shift position data acquired this time is different from the A / T shift position data currently displayed and stored in the RAM, the A / T shift position data is changed. (Y in step S33), then the previous A / T shift position data stored in the RAM is changed (updated) to the A / T shift position data fetched this time (step S34), and then the main routine of FIG. Return to. On the other hand, if the A / T shift position data fetched this time is the same as the A / T shift position data fetched last time, the A / T shift position data is not changed (N in step S33). Return to the main routine.

  Returning to FIG. 5, next, the screen data (odd / trip meter data) to be displayed in the area C is generated (step S4).

  The process of step S4 is performed by executing a subroutine shown in FIG. That is, as shown in FIG. 8, first, the vehicle speed pulse data in the CAN data acquired in step S1 is acquired (step S41), and then the vehicle speed pulses are integrated (step S42). The integrated value of the vehicle speed pulse is a value indicating the total travel distance.

  Next, it is determined whether or not the total sum is 1 km or more (step S43). If not (N in step S43), then the process returns to step S41 (Y in step S43). 1 km is added to the previous odometer value (step S44). Next, the added odometer value is stored in the EEPROM 27 (step S44), and then the process returns to the main routine of FIG.

  Returning to FIG. 5, next, the screen A, B and C data generated in steps S2, S3 and S4 are combined (step S5), and then the combined screen data is output to the LCD controller 38 (step S6). .

  Next, the display control operation of the LCD in the vehicle meter of the first embodiment will be described.

  First, CAN data is taken in via the I / F circuit 25, input and calculation processing is performed by the CPU 21, and screen data for displaying in the A area of the screen of the LCD 39, that is, screen A data for displaying the outside air temperature. Screen data to be displayed in the B area of the screen of the LCD 39, that is, screen B data to display the A / T shift position, and screen data to be displayed in the C area of the screen of the LCD 39, that is, odd / trip. The screen C data for displaying the meter is generated separately and asynchronously, and then the generated screen data is synthesized.

  Then, the CPU 21 periodically transmits the combined screen data to the LCD controller 38. The LCD controller 38 supplies the COM signal and the SEG signal to the LCD 39 based on the composite screen data transmitted from the CPU 21, displays the outside air temperature in the A area divided along the COM signal line of the LCD, and displays the B area. Display the A / T shift position on, and display the od / trip meter in the C area.

  Thus, according to the first embodiment of the present invention, the plurality of display areas are divided along the COM signal line so as not to share the same COM signal line, and thus visibility is improved. In addition, even if the signal input timing (from the vehicle) and the display update time are different for each display content, the display data is generated separately (asynchronously) for each area, so there is no simple interference with other areas. Display control becomes possible. Further, since there is no mutual interference, it is possible to flexibly cope with specification changes such as addition or deletion of new areas.

  (Second Embodiment) Next, a second embodiment of the present invention will be described. In the second embodiment, in the vehicle meter shown in FIG. 4, the screen data generation process executed by the CPU 21 employs the display control method based on the CPU process flow 2 described above.

  Hereinafter, screen data generation processing executed by the CPU 21 of the vehicle meter according to the second embodiment will be described with reference to the flowchart of FIG.

  First, the CAN data is taken in via the I / F circuit 25 (step S11), and then the screen data (outside temperature data) to be displayed in the area A on the screen of the LCD 39 is generated (step S12). The processing in step S12 is performed by executing a subroutine shown in FIG. 6 as in the first embodiment. Next, the screen A data generated in step S12 is output to the LCD controller 38 (step S13).

  Next, a process for generating screen data (A / T shift position data) to be displayed in the B area is performed (step S14). The processing in step S14 is performed by executing a subroutine shown in FIG. 7 as in the first embodiment. Next, the screen B data generated in step S14 is output to the LCD controller 38 (step S15).

  Next, a process of generating screen data (odd / trip meter data) to be displayed in the area C is performed (step 16). The processing in step S16 is performed by executing a subroutine shown in FIG. 8 as in the first embodiment. Next, the screen C data generated in step S16 is output to the LCD controller 38 (step S17), and then the process ends.

  Next, the display control operation of the LCD in the vehicle meter of the second embodiment will be described.

  First, CAN data is taken in via the I / F circuit 25, input and calculation processing is performed by the CPU 21, and screen data for displaying in the A area of the screen of the LCD 39, that is, screen A data for displaying the outside air temperature. Screen data to be displayed in the B area of the screen of the LCD 39, that is, screen B data to display the A / T shift position, and screen data to be displayed in the C area of the screen of the LCD 39, that is, odd / trip. The screen C data for displaying the meter is generated separately and asynchronously.

  Then, the CPU 21 asynchronously transmits the generated screen A data, screen B data, and screen C data to the LCD controller 38. The LCD controller 38 supplies a COM signal and a SEG signal corresponding to the screen data to the LCD 39 each time the screen data is asynchronously transmitted from the CPU 21, and the area is divided along the COM signal line of the LCD. The outside air temperature is displayed in the A area, the A / T shift position is displayed in the B area, and the odometer / trip meter is displayed in the C area.

  Thus, according to the second embodiment of the present invention, the plurality of display areas are divided along the COM signal line so as not to share the same COM signal line, and thus visibility is improved. In addition, even if the signal input timing (from the vehicle) and the display update time are different for each display content, the display data is generated separately (asynchronously) for each area, so there is no simple interference with other areas. Display control becomes possible. Further, since there is no mutual interference, it is possible to flexibly cope with specification changes such as addition or deletion of new areas.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various deformation | transformation and application are possible.

  For example, the LCD may include a COM signal line and a SEG signal line that are separately controlled by a plurality of LCD controllers. As an example, as shown in FIG. 10, the area for displaying the outside air temperature and the area for displaying the odrip meter are divided into a COM signal line A group (corresponding to the first COM signal line group in the claims) and an SEG signal line. It is composed of group A (corresponding to the first SEG signal line group in the claims), and the area for displaying the A / T shift position is the COM signal line B group (corresponding to the second COM signal line group in the claims) And SEG signal line B group (corresponding to the second SEG signal line group in the claims). The CPU 21 generates screen data for displaying the outside air temperature, screen data for displaying the odrip meter, and screen data for displaying the A / T shift position by the CPU processing flow 1 or the CPU processing flow 2 described above. The COM signal line A group and the SEG signal are supplied by one LCD controller (corresponding to the first LCD driving means in the claims) to which the screen data for displaying the outside air temperature and the screen data for displaying the odrip meter are supplied from the CPU 21. The COM signal line B group and the SEG are driven by another LCD controller (corresponding to the second LCD driving means in the claims) that drives the line A group and is supplied with screen data for displaying the A / T shift position from the CPU 21. The signal line B group is driven. Even in such a configuration, the visibility can be improved because the display control can be performed without the COM signal line extending over a plurality of display areas.

  As another embodiment, the dot of the COM signal line at the boundary between the display areas divided so as not to share the same COM signal line along the COM signal line is turned on to display the dividing line on the screen. May be. In this way, since each display area can be clearly divided and visually recognized, the visibility is further improved.

It is a figure which shows the screen display example of LCD by the display control method of the dot matrix type LCD of this invention. It is a figure which shows an example of the CPU processing flow by the display control method of the dot matrix type LCD of this invention. It is a figure which shows the other example of CPU processing flow by the display control method of the dot matrix type LCD of this invention. It is a block diagram which shows the electrical structural example of the meter for vehicles to which the display control apparatus which implements the display control method of the dot matrix type LCD which concerns on the 1st Embodiment of this invention is applied. (First embodiment) It is a flowchart which shows the screen data generation process which CPU of the meter for vehicles in the 1st Embodiment of this invention performs. (First embodiment) It is a flowchart which shows the subroutine in the flowchart of FIG. (First embodiment) It is a flowchart which shows the subroutine in the flowchart of FIG. (First embodiment) It is a flowchart which shows the subroutine in the flowchart of FIG. (First embodiment) It is a flowchart which shows the screen data generation process which CPU of the meter for vehicles in the 2nd Embodiment of this invention performs. (Second Embodiment) It is a figure which shows the other structural example of LCD which can apply the display control method of this invention. It is a figure which shows the structure of a general dot matrix type LCD. It is a figure explaining an example of the display control method of the conventional dot matrix type LCD. It is a figure explaining the other example of the display control method of the conventional dot matrix type LCD.

Explanation of symbols

21 CPU (screen data generation means)
38 LCD controller (LCD drive means)
39 Dot matrix type LCD

Claims (5)

A dot matrix type LCD screen formed by a plurality of COM signal lines and a plurality of SEG signal lines is divided into a plurality of display areas, and control is performed so that display patterns such as characters and numbers are displayed in the respective display areas. A display control method for a dot matrix LCD,
The screen is divided into the display areas so as not to share the same COM signal line, and the display pattern of the characters, numbers, and the like is respectively displayed by the COM signal line and the SEG signal line of each divided display area. A display control method for a dot matrix type LCD, characterized by controlling the display. A dot matrix LCD having a screen formed by a plurality of COM signal lines and a plurality of SEG signal lines;
Screen data generating means for dividing the screen of the dot matrix type LCD into a plurality of display areas so as not to share the same COM signal line, and generating screen data to be displayed in each of the divided display areas;
LCD driving means for supplying and driving the COM signal and SEG signal corresponding to the screen data generated by the screen data generating means to the COM signal line and SEG signal line of the dot matrix LCD. A display control device for a dot matrix type LCD. In the display control apparatus of the dot matrix type LCD according to claim 2,
The screen data generating means asynchronously generates screen data to be displayed in each display area, combines the generated screen data, and supplies the composite screen data to the LCD driving means. Type LCD display control device. In the display control apparatus of the dot matrix type LCD according to claim 2,
The screen data generation means asynchronously generates screen data to be displayed in the display areas, and supplies the generated screen data to the LCD driving means asynchronously. apparatus. In the display control apparatus of the dot matrix type LCD according to any one of claims 2 to 4,
The dot matrix type LCD is formed of a first display area formed by a first COM signal line group and a first SEG signal line group, and a second COM signal line group and a second SEG signal line group. Having a screen formed in the second display area,
The screen data generation means divides the first and / or second display area into a plurality of display areas so as not to share the same COM signal line, and the first and / or second display areas; Generate screen data to be displayed in each divided display area,
The LCD driving means outputs a COM signal and an SEG signal corresponding to the screen data to be displayed in the first display area generated by the screen data generating means to the first COM signal line of the dot matrix LCD. First LCD driving means for supplying and driving to the first SEG signal line group, and COM corresponding to the screen data to be displayed in the second display area generated by the screen data generating means And a second LCD driving means for supplying and driving the signal and the SEG signal to the second COM signal line group and the second SEG signal line group of the dot matrix type LCD. Type LCD display control device.

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