JP2001202229A - Display data transfer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display data transfer system for reducing a load at a host side in serially transferring display data from a host side to a display side. SOLUTION: In equipment 1 with a display mechanism, display data for one or several lines to be serially transferred from a system 1b side to a control panel 1a side are stored in a line buffer 13, and whether or not displayed data matched with the display data of the line buffer 13 are stored in preliminary display RAM 6-10 is compared by a comparator circuit 14, and when the matched display data are stored, a timing controller 12 reads the matched displayed data from the preliminary RAM 6-10, and writes the display data in a display RAM 5. A display controller 4 allows an LCD panel 2 to display the display data based on display bit map data stored in the display RAM 5. Therefore, it is possible to display the display data without serially transferring all the display data from the system 1b side to the control panel la side, and to reduce a load at the system 1b side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a display data transfer system, and more particularly, to a display data transfer system for reducing load on a host when serially transferring display data to a display side.

[0002]

2. Description of the Related Art Conventionally, in a display device, as a technique for reducing the load on the host side (system side) and reducing the interface between the host side and the display side, for example, writing to a page memory is performed by DMA ( Dire
ct Memory Access) controller and CPU (Ce
There is one that reduces the load on the central processing unit (see Japanese Patent Application Laid-Open No. 2-93590).

Conventionally, in a display control system having a plurality of display units, a display information memory and a display unit control circuit are connected to each display unit via an internal bus, and data reading during display is separated from the CPU. In some cases, the load on the CPU may be reduced (see Japanese Patent Application Laid-Open No. 2-77958).

However, in the technique described in Japanese Patent Application Laid-Open No. 2-93590, writing to a page memory is performed by using a DMA controller to reduce the load on the CPU. bus)
When reading data in the page memory for transfer to the display device, there is a problem that the system bus is occupied.

In the technique described in Japanese Patent Application Laid-Open No. 2-77958, a display information memory and a display control circuit are provided for each display unit, and each display information memory and the display control circuit are internally provided. When connected by a bus and reading out the data in the display information memory for transfer to the display device, the operation of the CPU is not affected, but the number of interfaces between the CPU and the memory increases, There has been a problem that the circuit configuration is complicated and expensive.

In view of this, the present applicant has first developed a display data transfer method between a host and an operating unit having a display means using bitmap data by using a display device in a bitmap manner. , With the lower address corresponding to the segment and the higher address corresponding to the common
AM and an address register for common selection and a RAM for storing display data on the host side.
By direct memory access (DMA), a common selection address is first output from the address register to the operation unit, and subsequently, segment data corresponding to the common is sequentially transferred. On the operation unit side, each time the segment data is received, the lower address is incremented, and based on this, the display data transfer method of transferring the display data in the RAM on the host side to the display RAM of the operation unit is proposed. (See Japanese Patent Application Laid-Open No. 5-225320).

[0007]

However, in such a display data transfer system, in order to further reduce the load on the host side and to reduce the cause of malfunction due to unnecessary radio waves and noise. , There was a need for improvement.

That is, in the conventional display data transfer method, it is necessary to transfer the display data from the host to the display unit every time the content of the display data to be displayed on the display unit changes. In order to reduce the load on the device, and to reduce the cause of malfunction due to unnecessary radio waves and noise, there is a need for improvement.

Therefore, according to the first aspect of the present invention, the display data which has been bit-mapped is serially transferred from the host to the display side, and the display data is stored in the display data storage means and then displayed on the display means. In this case, different display data are stored in advance in a predetermined number of preliminary display data storage means as preliminary display data, and one line or several lines of display data are serially transferred from the host to the display side. Is stored in the transfer data storage means as comparison display data, and the comparison means compares whether or not preliminary display data matching the comparison display data stored in the transfer data storage means is stored in the preliminary display data storage means. If the matching preliminary display data is stored in the preliminary display data storage means, the control means displays the display data from the host. And transferring the corresponding preliminary display data of the corresponding preliminary display data storage means as display data to the display data storage means, so that the same preliminary display data as the display data is stored in the preliminary display data storage means. In some cases, all display data is not transferred from the host side to the display side, but is displayed using the preliminary display data in the preliminary display data storage means, so that the load on the host side can be reduced. It is an object of the present invention to provide a display data transfer method that can suppress the cause of malfunction due to noise.

According to a second aspect of the present invention, when specific command data is transferred from the host side after display data for one line or several lines is transferred from the host side to the display side, the comparing means is sent to the comparing means. By comparing whether or not the preliminary display data that matches the comparative display data stored in the transfer data storage means is stored in the preliminary display data storage means, it is possible to instruct the host to omit the transfer of the display data. In addition, it is possible to prevent erroneous determination of display data that is confusing with display data among the preliminary display data stored in the preliminary display data storage unit, to reduce the load on the host side, to optimize data transfer, and to eliminate unnecessary data. It is an object of the present invention to provide a display data transfer method capable of suppressing a malfunction caused by radio waves or noise.

According to a third aspect of the present invention, the latest display data serially transferred from the host is sequentially stored in a predetermined number of preliminary display data storage means, and the preliminary display data stored in the preliminary display data storage means is stored. Is managed by the history management means, without having to separately transfer the preliminary display data from the host to the preliminary display data storage means.
In addition to providing appropriate display, frequently used display data can be automatically stored as preliminary display data,
It is an object of the present invention to provide a display data transfer method that can further reduce the load on the host.

According to a fourth aspect of the present invention, the address management for each character string of the preliminary display data stored in the preliminary display data storage means is performed by the character string address management means, and the comparison means is configured to perform the character string address management. By comparing the comparison display data with the preliminary display data for each character string based on the address of each character string managed by the management means, the first line or several lines are compared for each character string. It is referred to as display data and compared with the preliminary display data to increase the probability that preliminary display data of a character string matching one or several lines of serially transferred display data is stored in the preliminary display data storage means. It is another object of the present invention to provide a display data transfer method capable of further reducing the load on the host.

According to a fifth aspect of the present invention, the font size of the preliminary display data stored in the preliminary display data storage means is managed by the font size management means, and the font size managed by the font size management means is managed by the font size management means. By comparing the comparison display data with the preliminary display data for each character string based on the character string, the display data and the preliminary display data can be properly compared even when the font size of the display data is changed. It is an object of the present invention to provide a display data transfer method capable of coping with the above and reducing the load on the host.

[0014] According to a sixth aspect of the present invention, there is provided an auxiliary display data storage unit, a transfer data storage unit, a comparison unit, and a control unit.
Alternatively, history management means, address management means for each character string,
The font size management means is provided on the display side in a bus system different from the data bus system on the display side, and the display data is transferred to the display side as serial data. It is possible to apply a display data transfer method with good usability, by using the configuration of the display device as it is and applying a plurality of display data transfer destinations and using the display data as scroll data. It is intended to provide.

According to a seventh aspect of the present invention, there is provided a display data storage means, a transfer data storage means, a comparison means and a control means,
Alternatively, history management means, address management means for each character string,
By providing the font size management means on the host side and transferring the display data as serial data to the display side, it is applied to a conventional display device such as an LCD with a built-in display RAM using the configuration of the display device as it is. It is possible to provide a display data transfer method with good usability, in which a plurality of display data transfer destinations can be provided and the display data can be used as scroll data.

[0018] The invention according to claim 8 is characterized in that: preliminary display data storage means, transfer data storage means, comparison means and control means,
Alternatively, history management means, address management means for each character string,
The font size management means is provided on the display side in a bus system different from the data bus system on the display side, and the display data is transferred as parallel data to the data bus system on the display side. Display device,
It is an object of the present invention to provide a display data transfer method which can be applied using the structure of the display device as it is, can transfer display data in parallel, and has good usability.

According to a ninth aspect of the present invention, there is provided a display data storage unit, a transfer data storage unit, a comparison unit, a control unit,
Alternatively, history management means, address management means for each character string,
By providing the font size management means on the host side and transferring the display data as parallel data to the display side, it is applied to a conventional display device such as an LCD with a built-in display RAM by utilizing the configuration of the display device as it is. It is another object of the present invention to provide a display data transfer method which can transfer display data in parallel and has good usability.

[0018]

According to a first aspect of the present invention, there is provided a display data transfer system for serially transferring display data obtained by bitmap development from a host to a display, and storing the display data on the display. Then, in a display data transfer method for displaying on the display means, different display data are stored in advance in a predetermined number of preliminary display data storage means as preliminary display data, and are serially transferred from the host side to the display side. Among the display data, 1
Display data for one or several lines is stored in the transfer data storage means as comparison display data, and the preliminary display data that matches the comparison display data stored in the transfer data storage means is stored in the preliminary display data storage means. If the preliminary display data that matches the comparison display data is stored in the preliminary display data storage unit, the control unit transmits a serial number of the display data from the host. The above object is attained by stopping the transfer and transferring the corresponding preliminary display data of the preliminary display data storage means to the display data storage means as display data.

According to the above arrangement, the display data that has been bit-mapped is serially transferred from the host to the display side, and the display side stores the display data in the display data storage unit and then displays the display data on the display unit. Different display data is stored in advance in a predetermined number of preliminary display data storage means as preliminary display data, and display data for one line or several lines of display data serially transferred from the host to the display side is compared with comparison display data. The comparison data is stored in the transfer data storage means, and the comparison means compares whether or not the preliminary display data matching the comparison display data stored in the transfer data storage means is stored in the preliminary display data storage means. When the display data is stored in the preliminary display data storage unit, the control unit transmits the display data serially from the host. Since the transmission is stopped and the corresponding preliminary display data of the preliminary display data storage unit is transferred as display data to the display data storage unit, the preliminary display data storage unit has the same preliminary display data as the display data. Sometimes, the display can be performed using the preliminary display data in the preliminary display data storage unit without transferring all the display data from the host to the display side, so that the load on the host side can be reduced and unnecessary. The cause of malfunction due to radio waves or noise can be suppressed.

In this case, for example, as set forth in claim 2, after the display data for one line or several lines is transferred from the host side to the display side, a specific command data is transmitted. Is transferred from the host side, the comparing means is caused to compare whether or not the preliminary display data that matches the comparative display data stored in the transfer data storage means is stored in the preliminary display data storage means. You may.

According to the above configuration, when specific command data is transferred from the host after display data for one line or several lines is transferred from the host to the display, the transfer data is sent to the comparing means. Since it is compared whether or not the preliminary display data that matches the comparative display data stored in the storage means is stored in the preliminary display data storage means, it is possible to instruct the host to omit the transfer of the display data. In addition, it is possible to prevent erroneous determination of display data that is confusing with display data among the preliminary display data stored in the preliminary display data storage unit, and to optimize the data transfer while reducing the load on the host side. In addition, the cause of malfunction due to unnecessary radio waves and noise can be suppressed.

Further, for example, the predetermined number of preliminary display data storage means sequentially stores the latest display data serially transferred from the host, and stores the preliminary display data. The preliminary display data stored by the means may be history-managed by the history management means.

According to the above arrangement, the latest display data serially transferred from the host is sequentially stored in the predetermined number of auxiliary display data storage means, and the auxiliary display data stored in the auxiliary display data storage means is stored in the history. Since the history is managed by the management means, appropriate display can be performed without transferring the preliminary display data from the host side to the preliminary display data storage means, and frequently used display data is used as the preliminary display data. The data can be automatically stored, and the load on the host can be further reduced.

Furthermore, for example, as described in claim 4, address management for each character string of the preliminary display data stored in the preliminary display data storage means is performed by a character string address management means, and the comparison is performed. Means for determining whether the comparison display data matches the preliminary display data stored in the preliminary display data storage means for each character string based on an address for each character string managed by the character string address management means. May be compared to

According to the above configuration, the address management for each character string of the preliminary display data stored in the preliminary display data storage means is performed by the character string address management means, and the comparison means is configured to execute the character string address management means. The comparison display data and the preliminary display data are compared for each character string based on the address of each character string managed by each character string, so the first line or several lines at the beginning of each character string are compared and displayed. It can be compared with the preliminary display data by referring to the data, and the probability that the preliminary display data of the character string corresponding to one line or several lines of the serially transferred display data is stored in the preliminary display data storage means is calculated. Raise it,
The load on the host can be further reduced.

Further, for example, the font size of the preliminary display data stored in the preliminary display data storage unit is managed by a font size management unit, and the font size of the font size is stored in the preliminary display data storage unit. The comparison display data may be compared with the preliminary display data stored in the preliminary display data storage unit for each character string based on a font size managed by a management unit.

According to the above configuration, the font size of the preliminary display data stored in the preliminary display data storage means is managed by the font size management means, and the comparison means is configured to execute the comparison based on the font size managed by the font size management means. The comparison display data and the preliminary display data are compared for each character string, so even if the font size of the display data is changed, the display data and the preliminary display data are properly compared. It is possible to cope with this, and the load on the host can be reduced.

Further, for example, as described in claim 6, the preliminary display data storage means, the transfer data storage means, the comparison means and the control means, or the history management means, the character string address management. The means and the font size management means may be provided on the display side in a bus system different from the data bus system on the display side, and may transfer the display data as serial data to the display side.

According to the above arrangement, the preliminary display data storage means, the transfer data storage means, the comparison means and the control means, or the history management means, the address management means for each character string, and the font size management means are provided on the display side. Since the display data is provided to the display side as serial data by being provided in a bus system different from the data bus system of the
In addition to being able to apply the configuration of the display device as it is to a display device such as an LCD with a built-in M, it is also possible to provide a plurality of display data transfer destinations and to use the display data as scroll data. Performance can be improved.

Further, for example, as described in claim 7, the preliminary display data storage means, the transfer data storage means, the comparison means and the control means, or the history management means, the character string address management. The means and the font size management means may be provided on the host side, and may transfer the display data to the display side as serial data.

According to the above arrangement, the host is provided with the preliminary display data storage means, the transfer data storage means, the comparison means and the control means, or the history management means, the address management means for each character string, and the font size management means. Since the display data is transferred to the display side as serial data, it can be applied to a conventional display device such as an LCD with a built-in display RAM by utilizing the configuration of the display device as it is, and the display data transfer destination Can be provided, and display data can be used as scroll data, so that usability can be improved.

Further, for example, as described in claim 8, the preliminary display data storage means, the transfer data storage means, the comparison means and the control means, or the history management means, the character string address management. Means, the font size management means is provided on the display side in a bus system different from the data bus system on the display side, and may transfer the display data as parallel data to the data bus system on the display side. Good.

According to the above arrangement, the preliminary display data storage means, the transfer data storage means, the comparison means and the control means, or the history management means, the address management means for each character string, and the font size management means are displayed on the display side. Since it is provided on a bus system different from the data bus system on the display side and the display data is transferred as parallel data to the data bus system on the display side,
The configuration of the display device can be directly applied to a display device such as an LCD with a built-in display RAM, and the display data can be transferred in parallel, so that the usability can be improved.

Further, for example, as described in claim 9, the preliminary display data storage means, the transfer data storage means, the comparison means and the control means, or the history management means, the character string address management. The means and the font size management means may be provided on the host side, and transfer the display data to the display side as parallel data.

According to the above arrangement, the host is provided with the preliminary display data storage means, the transfer data storage means, the comparison means and the control means, or the history management means, the address management means for each character string, and the font size management means, Since the display data is transferred to the display side as parallel data, it can be applied to a conventional display device such as an LCD with a built-in display RAM by using the configuration of the display device as it is, and the display data can be transferred in parallel. It can be transferred and the usability can be improved.

[0036]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. It should be noted that the embodiments described below are preferred embodiments of the present invention, and therefore, various technically preferable limitations are added. However, the scope of the present invention is not limited to the following description. The embodiments are not limited to these embodiments unless otherwise specified.

1 to 6 show a first embodiment of the display data transfer system of the present invention. FIG. 1 shows the first embodiment of the display data transfer system of the present invention. FIG. 2 is a main circuit block diagram of the device 1 with a display mechanism shown in FIG.

In FIG. 1, a device 1 with a display mechanism is generally applied to various devices having a display mechanism, such as a personal computer, a facsimile machine, and a printer. 1), the right side divided by the dashed line in FIG.
The b side (host side).

The device 1 with a display mechanism includes an LCD (Liquid Crystal Display) panel 2, an LC
D driver 3, display controller 4, display RAM (Ra
ndomAccess Memory) 5, 5 spare display RAMs 6 ~
10, S / P register 11, timing controller 1
2, line buffer 13, compare circuit 14, command control unit 15, display history management unit 16, display RAM address management unit 17, character string display RAM address management unit 1
8 and a character string setting unit 19 and the like, and the main parts are connected by an operation data bus 20.

The device 1 with a display mechanism includes a P / S register 21 and an MPU (Micro Processing Unit) on the system 1b side.
nit) 22 and a RAM 23, etc., and the main components are connected by a system data bus 24. In the present embodiment, a liquid crystal display unit using the LCD panel 2 and the LCD driver 3 is adopted as a display unit (display means). However, the display unit is not limited to these, and other display units may be used. In other words, any display method may be used as long as display is performed using bit data.

In the RAM 23 of the system 1b, display data (display data) is bit-mapped and stored, and more specifically, a character code string corresponding to a display character string is stored according to font data. The MPU 22 uses R
The display data in the AM 23 is sequentially read out, written into the P / S register 21 via the system data bus 24, and the P / S register 21 converts the parallel display data into serial data. / P register 11 is serially transferred line by line. The transfer of the display data from the system 1b side to the operation panel 1a side may be performed by a DMA (Direct Memory Access) controller.

The display-equipped device 1 converts the serial display data transferred from the P / S register 21 of the system 1b to the S / P register 11 of the operation panel 1a into an S / P register 11.
/ P register 11 converts the data into parallel, then the display RA
It is stored in M5 (display data storage means). At this time, the timing controller (control means) 12 controls the operation timing and outputs necessary control signals.

In the preliminary display RAMs (preliminary display data storage means) 6 to 10, display bitmap data corresponding to a character string different from that of the display RAM 5, for example, the latest history data, or preset data is stored. The frequently used display data and the like are transferred from the system 1b side and stored as preliminary display data, and the addresses are managed by a display RAM address management unit 17 and a character string display RAM address management unit 18 described later. To be displayed on the LCD panel 2.

Line buffer (transfer data storage means) 1
Reference numeral 3 denotes one or several lines of display data from the top of the display data transferred from the P / S register 21 on the system 1b side to the S / P register 11 on the operation panel 1a temporarily as comparison display data. Store, for example, FIG.
Assuming that the display data on the LCD panel 2 has the contents shown in the upper part of FIG.
The display data on the lower side of FIG. 2 is temporarily stored. In FIG. 2, a to h on the right side indicate display rows, and “0” on the lower side of FIG. 2 indicates lighting and “1” indicates off.

The compare circuit (comparing means) 14 compares the display data (comparison display data) stored in the line buffer 13 and the display data (preliminary display data) stored in the preliminary display RAMs 6 to 10. If the two data are the same, the preliminary display RAM in which the display data is the same
It is determined that all display data 6 to 10 are to be written to the display RAM 5. That is, the compare circuit 14 compares the display data stored in the line buffer 13 with the display data stored in the auxiliary display RAMs 6 to 10, and compares the display data stored in the auxiliary display RAMs 6 to 10 with the auxiliary display RAM storing the same data.
When detecting signals 6 to 10, a signal is output to the timing controller 12, and the timing controller 12 receives the signal and sends a signal to the MPU 22 on the system 1b side indicating that the subsequent transfer of display data is unnecessary. Then, the display data (display bitmap data) is read out from the auxiliary display RAMs 6 to 10 storing the corresponding display data and written into the display RAM 5. M
When the PU 22 receives the signal indicating that the transfer of the display data is unnecessary, the PU 22 stops the transfer of the display data in the RAM 23, and the display controller 4 sets the display data written in the display RAM 5. And read L
The image is displayed on the LCD parallel 2 via the CD driver 3.

The command control unit (control means) 15 recognizes a specific command set in advance sent from the system 1b and, when recognizing the specific command, as described above, stores the display RAM 5 in the compare circuit 14. And the display data of the preliminary display RAMs 6 to 10 are compared, and the matched display data of the preliminary display RAMs 6 to 10 are displayed.
M5 is written and displayed on the LCD panel 2. That is, the specific command referred to here is the same display data as the display data previously or the preliminary display RAMs 6-1.
A command that has been transferred as display data for 0 (preliminary display data), has been stored in the preliminary display RAMs 6 to 10, and specifies that the transfer of display data from the system side should be omitted. It is.

Therefore, by using this specific command, it is possible to prevent erroneous determination of confusing 1-line data (display characters may be different even for the same 1-line data).

The display history management unit (history management means) 16
Using the latest display data stored in the display RAM 5 as history data, five types, each of the preliminary display RAMs 6-1
Store to 0. Therefore, the preliminary display RAMs 6 to 10
It is not necessary to transfer the display bitmap data stored in the display side from the system side.
The latest display bitmap data of the display bitmap data transferred to M5 is stored in the preliminary display RAM 6 respectively.
To 10 can be stored.

The display RAM address management unit 17 assigns addresses of the preliminary display RAMs 6 to 10, manages the address of the first line, and the like.

The character string display RAM address management unit (character string address management means) 18
Address management is performed for each character string of 10 to 10. That is, the display RAM address management unit 18 for each character string stores the preliminary display RAMs 6 to 1 as display bitmap data for one screen.
As shown in FIG. 3, address management for each character string is performed by referring to one or several lines at the head of the first character string and the second character string without managing 0.

As described above, when the address management for each character string of the preliminary display RAMs 6 to 10 is performed by the character string display RAM address management unit 18, for example, as shown in FIG. As one character string,
"WAIT!" As the second character string is stored in the preliminary display RAM 7 as "Mattekdasai" as the first character string.
Is stored as a second character string, and the display data of the preliminary display RAM 6 is transferred and stored in the display RAM 5, and the first character string is stored in the LCD panel 2.
As a character string, “in the middle”
When "WAIT!" Is displayed, the preliminary display R
Display the second character string of "AM7""Denwanaka" RAM5
Can be displayed on the LCD panel 2 as the first character string, and "WAIT!" As the second character string.

Character string setting unit (font size management means)
19 manages the font size and, when the font size is changed, matches the first photo according to the photo size after the change.
RAM for spare display, which manages lines or several lines
The display bitmap data 6 to 10 are stored in the display RAM 5 for each display character string.

Next, the operation of the present embodiment will be described. As shown in FIG. 1, the device 1 with a display mechanism includes an operation panel 1.
The S / P register 11 converts display data serially transferred from the system 1b side into parallel data by the S / P register 11 and then stores the data in the display RAM 5. The display device 1 usually transfers display data in the display RAM 5 to the display controller 4, and the display controller 4 causes the LCD panel 2 to display the data on the LCD panel 2.

However, the device with display mechanism 1 stores one or several lines of display data to be transferred from the system 1b to the operation panel 1a in the line buffer 13, and the compare circuit 14 stores the data in the line buffer 13. The stored display data is compared with the display data stored in the preliminary display RAMs 6 to 10. The display data transferred from the system 1b in advance or display data obtained by acquiring the latest display data as history data is stored in the preliminary display RAMs 6 to 10.

When the compare circuit 14 determines that display data matching the display data stored in the line buffer 13 is stored in the preliminary display RAMs 6 to 10, it outputs a signal to the timing controller 12. , The timing controller 12 receives this signal,
A preliminary display R storing the corresponding display data.
The corresponding display data is read out from the AMs 6 to 10 and written into the display RAM 5.

The display controller 4 controls the preliminary display R
The LCD panel 2 performs display based on the display bitmap data read from the AMs 6 to 10 and stored in the display RAM 5.

Therefore, display data can be displayed without serially transferring all display data from the system 1b to the operation panel 1a, and the load on the system 1b, that is, the load on the MPU 22 can be reduced. And the cause of malfunction due to unnecessary radio waves and noise can be reduced.

The device 1 with a display mechanism includes a command control unit 15. The command control unit 15 transfers the display data from the system 1b after transferring the display data for one line or several lines. When the specific command indicating that the transfer is omitted is transmitted, and when the specific command is recognized, the comparison circuit 14 compares the display data of the display RAM 5 with the display data of the preliminary display RAMs 6 to 10. The display data of the preliminary display RAMs 6 to 10 which match the controller 12 are displayed on the display RAM 5.
And display it on the LCD panel 2.

Therefore, it is possible to prevent erroneous determination of confusing 1-line data (the display characters may be different even for the same 1-line data), and to determine whether the display data is transferred on the operation parallel 1b side. Can be instructed, and the load on the system 1b side can be further reduced.

The display-equipped device 1 further includes a display history management unit 16 for storing, for example, five types of the latest history data stored in the display RAM 5 in the preliminary display RAMs 6 to 10, respectively. .

Therefore, the display data stored in the auxiliary display RAMs 6 to 10 need not be transferred from the system 1b, and the latest display data among the display data transferred to the display RAM 5 for display is not required. Data can be stored in the preliminary display RAMs 6 to 10, respectively.

As a result, the display data frequently used for display is frequently stored in the preliminary display RAMs 6 to 10, and the character string to be displayed is stored in the preliminary display RAM.
The probability of being stored in 6 to 10 is increased, so that the load on the system 1b side, that is, the MPU 22 can be further reduced, and the cause of malfunction due to unnecessary radio waves and noise can be reduced.

The device with display mechanism 1 includes a character string display RAM address management unit 18. The character string display RAM address management unit 18 includes a spare display RAM.
Address management is performed for each of 6 to 10 character strings. That is,
The character string display RAM address management unit 18 stores the preliminary display RAMs 6 to as bitmap data for one screen display.
As shown in FIG. 3, address management for each character string is performed by referring to the first line or several lines of the first character string and the second character string without managing the number 10.

Therefore, the display data of the auxiliary display RAMs 6 to 10 is managed in units of character strings, and the character strings of the display RAM 5 and the auxiliary display RAMs 6 to 10 are appropriately replaced, thereby displaying the data on the LCD panel 2. The character string to be displayed can be appropriately changed and displayed in character string units.

Further, the device 1 with a display mechanism includes a character string setting section 19, which manages the font size and adjusts the font size to match the changed photo size when the font size is changed. Then, the first line or several lines are managed, and the display data of the preliminary display RAMs 6 to 10 is stored in the display RAM 5 for each display character string.

Therefore, for example, as shown in FIG.
As the first character string, "Two Shin", as the second character string, "WAIT", and as the third character string, "A MO
When "M" is displayed in one-byte characters, the font size is managed by the character string setting unit 19, so that, for example, as shown in FIG.
As a second character string, "Wait!" Can be displayed in full-width. As a result, even when the font size of the display characters is changed, the load on the system 1b side,
That is, it is possible to appropriately change the font size while reducing the load on the MPU 22.

FIG. 7 is a diagram showing a second embodiment of the display data transfer system according to the present invention. The device 30 with a display mechanism to which the second embodiment of the display data transfer system of the present invention is applied is shown. It is a principal part circuit block diagram.

This embodiment is applied to a device with a display mechanism similar to the device 1 with a display mechanism of the first embodiment, and is a device with a display mechanism of the first embodiment. The same components as those in 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 7, a device 30 with a display mechanism is
The operation panel 30a includes an LCD panel 2, an LD driver 3, a display controller 4, a display RAM 5, and an S / P register 11 similar to those of the first embodiment, and also includes a timing controller 12. , P / S register 21 and MPU on system 30b side
22 and a RAM 23.

The device 30 with a display mechanism includes a transfer data controller 31 between the P / S register 21 and the S / P register 11.
Are the five preliminary display Rs similar to the first embodiment.
AM6-10, line buffer 13, compare circuit 1
4, a command control unit 15, a display history management unit 16, a display RAM address management unit 17, a character string display RAM address management unit 18, and a character string setting unit 19, and an S / P register 32, P / S A register 33 and a transfer data timing controller 34 are provided.

The S / P register 32 contains the system 30b
Serial display data is transferred from the side P / S register 21, and the S / P register 32 converts the display data into parallel under the control of the transfer data timing controller 34. The P / S register 33 converts display data transferred from the transfer data controller 31 to the operation panel 30a side from parallel to serial under the control of the transfer data timing controller 34, and converts the display data into the S / P register 11 on the operation panel 30a side. Forward.

The transfer data timing controller (control means) 34 controls the operation timing of each part of the transfer data controller 31 and outputs necessary control signals to control the operation of each part of the transfer data controller 31.

Preliminary display RAMs 6 to 10, line buffer 13, compare circuit 14, command control unit 15, display history management unit 16, display RAM address management unit 17, display RAM address management unit for each character string, and character string setting The part 19 is the same as in the first embodiment.

The transfer data controller 31 transmits data from the P / S register 21 on the system 30b side to the S / P register 32.
One or several lines of display data serially transferred to the line buffer 13 are fetched into the line buffer 13, and the same display data as the fetched display data is stored in the preliminary display R.
The comparison circuit 14 compares whether the data is stored in the AM 6 to 10 or not, and if the same display data is stored, the transfer timing controller 34 sets the MPU 2 in the system 30b.
2, a signal indicating that subsequent display data transfer is unnecessary is sent out, and a signal indicating that the transfer is the same is output to the transfer data timing controller 34. Upon receiving this signal, the transfer data timing controller 34 sets the spare display RAM storing the matching display data.
The display data (display bitmap data) is read from 6 to 10 and serially converted by the P / S register 33, and then transferred to the operation panel 30a. Under the control of the timing controller 12, the display-equipped device 30 transmits the display data serially transferred to the operation panel 40a under the control of the timing controller 12.
After the parallel conversion by the / P register 11, the display RAM
5 and the display controller 4 makes this display RA
The display data written in M5 is read out, and the
The data is displayed on the LCD parallel 2 via the driver 3.

On the other hand, when the MPU 22 receives a signal indicating that the transfer of the display data thereafter is not necessary, the MPU 22
The transfer of the display data in 3 is stopped.

Then, the transfer data controller 31
It may be provided on the system 30b side, or may be provided on the operation panel 30a side as a bus system different from the bus system of the operation data bus 20.

Next, the operation of the present embodiment will be described. The device 30 with a display mechanism according to the present embodiment includes a system 30b.
A transfer data controller 31 is provided in the middle of serially transferring display data from the side to the operation panel 30a side.
A compare circuit 14 for comparing whether the display data to be transferred is the same as the display data of the M6 to 10 or the preliminary display RAMs 6 to 10, a line buffer 13 for storing one or several lines of display data, a command control unit 15, etc. It has.

Therefore, the transfer data controller 31
Is provided on the operation panel 30a side, the transfer data controller 31 is provided separately from the data bus of the operation panel 30a.
The device 30 with a display mechanism can be manufactured using the D display unit or the like as it is, and the cost can be reduced. Further, the transfer of the display data from the system 30b is performed via the transfer data controller 31, and a plurality of display data transfer destinations can be set. As a result, the present invention can be applied to the scrolling LED data, and the usability can be improved.

When the transfer data controller 31 is provided on the system 30b side, the space of the operation panel 30a can be saved.

FIG. 8 is a diagram showing a third embodiment of the display data transfer system according to the present invention. The device 40 with a display mechanism to which the second embodiment of the display data transfer system of the present invention is applied is shown. It is a principal part circuit block diagram.

This embodiment is applied to a device with a display mechanism similar to the device 1 with a display mechanism of the first embodiment, and the device with a display mechanism of the first embodiment is applied. The same components as those in 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 8, a device 40 with a display mechanism is
On the operation panel 40a side, the same LCD panel 2, LD driver 3, and display controller 4 as in the first embodiment are provided.
And a display RAM 5, and a timing controller 12.
A P / S register 21, an MPU 22, a RAM 23 and the like are provided. The device 40 with a display mechanism has an operation panel 4
The S / P register 11 is not provided on the 0a side.

The device with display mechanism 40 has a transfer data controller 41 between the P / S register 21 and the operation data bus.
Five spare display RAMs similar to the first embodiment
6 to 10, line buffer 13, compare circuit 14, command control unit 15, display history management unit 16, display RAM
An address management unit 17, a character string display RAM address management unit 18, and a character string setting unit 19 are provided.
A P register 42, a parallel write control unit 43, a transfer data timing controller 44, and the like are provided.

The S / P register 42 contains the system 40b
Serial display data is transferred from the side P / S register 21, and the S / P register 42 converts the display data into parallel under the control of the transfer data timing controller 44. The parallel writing control unit 43 transfers display data to be transferred in parallel from the transfer data controller 41 to the operation panel 40a side by the transfer data timing controller 4.
Under the control of 4, the data is directly transferred to the display RAM 5 via the operation data bus 20 on the operation panel 40a side.

Transfer data timing controller 44
Controls the operation timing of each unit of the transfer data controller 41 and outputs necessary control signals to control the operation of each unit of the transfer data controller 41.

Preliminary display RAMs 6 to 10, line buffer 13, compare circuit 14, command control unit 15, display history management unit 16, display RAM address management unit 17, display RAM address management unit 18 for each character string, and character string setting The part 19 is the same as in the first embodiment.

The transfer data controller 41 changes the P / S register 21 on the system 40b side to the S / P register 42
One line or several lines of the display data transferred to the auxiliary display RAMs 6 to 1 are fetched into the line buffer 13 and the same display data as the fetched display data is stored.
0 is compared by the compare circuit 14, and if the same display data is stored, the transfer timing controller 34 sends a signal to the MPU 22 on the system 40b side indicating that subsequent display data transfer is unnecessary. At the same time, it sends a signal to the transfer data timing controller 44 to the effect that it matches. Upon receiving this signal, the transfer data timing controller 44 reads display data (display bitmap data) from the preliminary display RAMs 6 to 10 storing the corresponding display data, and transfers the read data to the parallel write controller. From 43, parallel transfer is performed to the operation panel 40a side. The display mechanism-equipped device 40 writes the display data transferred in parallel to the operation panel 40a to the display RAM 5 under the control of the timing controller 12, and the display controller 4 reads the display data written to the display RAM 5. Then, the image is displayed on the LCD parallel 2 via the LCD driver 3.

On the other hand, when the MPU 22 receives a signal indicating that the transfer of the display data thereafter is not necessary, the MPU 22
The transfer of the display data in 3 is stopped.

Then, the transfer data controller 41
It may be provided on the system 40b side, or may be provided on the operation panel 40a side as a bus system different from the bus system of the operation data bus 20.

Next, the operation of the present embodiment will be described. The device 40 with a display mechanism according to the present embodiment includes a system 40b.
A transfer data controller 41 is provided in the middle of serially transferring display data from the display panel to the operation panel 40a side.
A compare circuit 14 for comparing whether the display data to be transferred is the same as the display data of the M6 to 10 or the preliminary display RAMs 6 to 10, a line buffer 13 for storing one or several lines of display data, a command control unit 15, etc. It has. Then, the transfer data controller 41
Direct operation panel 40 using display data as parallel data
a to the operation data bus 20.

Therefore, the transfer data controller 41
Is also provided on the operation panel 40a side, the transfer data controller 41 is provided separately from the operation data bus 20 of the operation panel 40a, and the conventional LCD display unit or the like with a built-in display RAM can be used as it is. The device 40 with a display mechanism can be manufactured, and the cost can be reduced. Further, the transfer of the display data from the system 40b is performed via the transfer data controller 41, and a plurality of display data transfer destinations can be set. As a result, the present invention can be applied to the scrolling LED data, and the usability can be improved.

When the transfer data controller 41 is provided on the system 40b side, the space of the operation panel 40a can be saved.

Further, since the display data is sent directly from the transfer data controller 41 to the operation data bus 20 in parallel, it is possible to cope with the case where the LCD unit is writing parallel data.

As described above, the invention made by the inventor has been specifically described based on the preferred embodiments. However, the present invention is not limited to the above, and various modifications can be made without departing from the gist of the invention. It goes without saying that it is possible.

[0095]

According to the display data transfer method of the first aspect of the invention, the display data that has been bit-mapped is serially transferred from the host to the display, and the display data is stored in the display data storage means. After that, when displaying on the display means, different display data are stored in advance in a predetermined number of preliminary display data storage means as preliminary display data, and one line of display data serially transferred from the host side to the display side is stored. Alternatively, display data for several lines is stored as comparison display data in the transfer data storage means, and whether or not preliminary display data matching the comparison display data stored in the transfer data storage means is stored in the preliminary display data storage means The preparatory display data is stored in the preliminary display data storage means. Since the serial transfer of display data from the printer side is stopped and the corresponding preliminary display data of the preliminary display data storage unit is transferred as display data to the display data storage unit, the display data is displayed on the preliminary display data storage unit. When there is the same preliminary display data as the data, the display can be performed by using the preliminary display data of the preliminary display data storage means without transferring all the display data from the host to the display side, thereby reducing the load on the host. It is possible to reduce the amount of noise and to suppress the cause of malfunction due to unnecessary radio waves and noise.

According to the display data transfer method of the present invention, specific command data is transferred from the host after one or several lines of display data are transferred from the host to the display. Then, the comparison unit is made to compare whether or not the preliminary display data that matches the comparison display data stored in the transfer data storage unit is stored in the preliminary display data storage unit. Can be instructed, and among the preliminary display data stored in the preliminary display data storage means, erroneous determination of display data and misleading data can be prevented, and data transfer while reducing the load on the host side can be prevented. And the cause of malfunction due to unnecessary radio waves and noise can be suppressed.

According to the display data transfer method of the present invention, the latest display data serially transferred from the host is sequentially stored in the predetermined number of preliminary display data storage means, and the preliminary display data storage is performed. Since the spare display data stored by the means is history-managed by the history management means, appropriate display can be performed without frequently transferring the spare display data from the host to the spare display data storage means. Display data to be used can be automatically stored as preliminary display data, and the load on the host can be further reduced.

According to the display data transfer method of the present invention, the address management for each character string of the preliminary display data stored in the preliminary display data storage means is performed by the character string address management means, and the comparison means Is based on the address of each character string managed by the character string address management means,
Since the comparison display data is compared with the preliminary display data for each character string, it is necessary to refer to the first line or several lines for each character string as the comparative display data and compare with the preliminary display data. The probability that the preliminary display data of the character string corresponding to one or several lines of the serially transferred display data is stored in the preliminary display data storage means is increased, thereby further reducing the load on the host side. Can be done.

According to the display data transfer method of the present invention, the font size of the preliminary display data stored in the preliminary display data storage means is managed by the font size management means, and the font size is compared with the font size by the font size management means. Since the comparison display data and the preliminary display data are compared for each character string based on the font size managed by the management means, even if the font size of the display data is changed, it is displayed properly. The data and the preliminary display data can be compared and corresponded, and the load on the host can be reduced.

According to the display data transfer method of the present invention, the auxiliary display data storage means, transfer data storage means, comparison means and control means, or history management means,
The character string address management means and the font size management means are provided on the display side in a bus system different from the data bus system on the display side, and display data is transferred to the display side as serial data. The structure of the display device can be directly applied to a display device such as a built-in LCD or the like, and a plurality of display data transfer destinations can be provided, and the display data can be used as scroll data. Can be improved.

According to the display data transfer method of the present invention, the auxiliary display data storage means, the transfer data storage means, the comparison means and the control means, or the history management means,
The character string address management means and the font size management means are provided on the host side, and the display data is transferred to the display side as serial data. The configuration can be used as it is, and a plurality of display data transfer destinations can be provided, and the display data can be used as scroll data, so that usability can be improved.

According to the display data transfer method of the present invention, a spare display data storage means, a transfer data storage means, a comparison means and a control means, or a history management means,
Since the character string address management means and the font size management means are provided on the display side in a bus system different from the data bus system on the display side, and the display data is transferred as parallel data to the data bus system on the display side. The configuration of the display device can be directly applied to a display device such as an LCD with a built-in display RAM, and the display data can be transferred in parallel, so that the usability can be improved.

According to the display data transfer method of the ninth aspect of the present invention, the auxiliary display data storage means, transfer data storage means, comparison means and control means, or history management means,
The character string address management means and the font size management means are provided on the host side, and the display data is transferred to the display side as parallel data. The configuration can be used as it is, and the display data can be transferred in parallel, so that the usability can be improved.

[Brief description of the drawings]

FIG. 1 is a main part circuit block diagram of a device with a display mechanism to which a first embodiment of a display data transfer method according to the present invention is applied.

FIG. 2 is a view showing an example of display on the LCD panel of FIG. 1 and an example of display data (transfer data).

FIG. 3 shows a first character string and a second character string of display bitmap data.
The figure which shows an example of a character string.

FIG. 4 is an explanatory diagram of a character string management state by a character string display RAM address management unit in FIG. 1;

FIG. 5 is a diagram showing an example in which a first character string to a third character string are displayed in half-width on the LCD panel of FIG. 1;

FIG. 6 is a view showing an example in which a first character string to a second character string are displayed in full-width on the LCD panel of FIG. 1;

FIG. 7 is a main part circuit block diagram of a device with a display mechanism to which a second embodiment of the display data transfer system of the present invention is applied.

FIG. 8 is a main part circuit block diagram of a device with a display mechanism to which a third embodiment of the display data transfer system of the present invention is applied.

[Description of Signs] 1 Device with display mechanism 1a Operation panel 1b System 2 LCD panel 3 LCD driver 4 Display controller 5 Display RAM 6-10 Preliminary display RAM 11 S / P register 12 Timing controller 13 Line buffer 14 Compare circuit 15 Command control unit 16 Display history management unit 17 Display RAM address management unit 18 RAM address management unit for each character string 19 Character string setting unit 20 Operation data bus 21 P / S register 22 MPU 23 RAM 30 Device with display mechanism 30a Operation Panel 30b System 31 Transfer data controller 32 S / P register 33 P / S register 34 Transfer data timing controller 40 Device with display mechanism 40a Operation panel 40b System 41 Transfer data controller 2 S / P register 43 parallel write control unit 44 transfers the data timing controller

Claims (9)

[Claims] In a display data transfer method, display data which has been bit-mapped is serially transferred from a host to a display side, and the display side stores the display data in a display data storage means and then displays the display data on the display means. Different display data is stored in advance in a predetermined number of preliminary display data storage means as preliminary display data, and one line or several lines of display data of the display data serially transferred from the host to the display side are stored. The comparison display data is stored in the transfer data storage means, and the comparison means compares whether or not the preliminary display data that matches the comparison display data stored in the transfer data storage means is stored in the preliminary display data storage means. The preliminary display data that matches the comparative display data is stored in the preliminary display data storage unit. Wherein the control means stops the serial transfer of the display data from the host side, and transfers the corresponding preliminary display data of the preliminary display data storage means to the display data storage means as display data. Display data transfer method to be used. 2. The control means according to claim 1, wherein when specific command data is transferred from the host after display data for one line or several lines is transferred from the host to the display, the comparison is performed. 2. The display data according to claim 1, wherein said means is configured to compare whether said preliminary display data that matches said comparative display data stored in said transfer data storage means is stored in said preliminary display data storage means. Transfer method. 3. The predetermined number of preliminary display data storage means,
3. The apparatus according to claim 1, wherein the latest display data serially transferred from the host is sequentially stored, and the history of the preliminary display data stored in the preliminary display data storage unit is managed by a history management unit. Display data transfer method described. 4. An address management unit for each character string of the preliminary display data stored in the preliminary display data storage unit, wherein the address management unit for each character string manages the address. 2. The method according to claim 1, wherein the comparison display data and the preliminary display data stored in the preliminary display data storage unit are compared for each character string based on an address for each character string to be managed. The display data transfer method according to any one of claims 1 to 3. 5. The font size of the preliminary display data stored in the preliminary display data storage unit is managed by a font size management unit, and the comparison unit is configured to store the font size based on the font size managed by the font size management unit. The display data according to any one of claims 1 to 4, wherein whether or not the comparison display data and the preliminary display data stored in the preliminary display data storage unit match is compared for each character string. Transfer method. 6. The pre-display data storage means, the transfer data storage means, the comparison means and the control means, or the history management means, the character string address management means, and the font size management means, 6. The display device according to claim 1, wherein the display device is provided on a bus system different from the data bus system on the display side, and transfers the display data to the display side as serial data. Display data transfer method. 7. The pre-display data storage means, the transfer data storage means, the comparison means and the control means, or the history management means, the character string address management means, and the font size management means, 6. The display data transfer method according to claim 1, wherein the display data is transferred to the display side as serial data. 8. The display data storage means, the transfer data storage means, the comparison means and the control means, or the history management means, the character string address management means, and the font size management means, 6. The display device according to claim 1, wherein the display data bus system is provided in a bus system different from the display-side data bus system, and the display data is transferred to the display-side data bus system as parallel data. Display data transfer method described in any of the above. 9. The apparatus according to claim 1, wherein said preliminary display data storage means, said transfer data storage means, said comparison means and said control means, or said history management means, said character string address management means, and said font size management means 6. The display data transfer method according to claim 1, wherein the display data is provided as parallel data to the display side.