JPS645313B2 - - Google Patents

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a display method for controlling image display.

(b) Prior Art and Problems A bitmap display that displays an image in a dot pattern configuration requires a display memory capacity (number of bits) equal to the number of dots forming the screen. In small electronic devices (e.g. facsimile devices), the liquid crystal display for operation guidance
If a display memory with the same amount of screen capacity (number of dots) is provided for storing image patterns of dot configuration,
The disadvantage was that the equipment was expensive.

(c) Object of the Invention The present invention has been made to solve the above-mentioned drawbacks, and aims to provide a display control method that can reduce display memory capacity.

(d) Structure of the Invention The present invention provides a device that has a display section and a control device and displays a rectangular image having M dots vertically and N dots horizontally on the display section as a unit image, in which the unit image is configured. vertical or horizontal dot pattern
an image pattern composed of hexadecimal data and in which the number of identical dot patterns is composed of a multiple symbol and multiple data; means for converting the data of the image pattern into the unit image; and a search means; When searching for the specified image pattern and extracting the data of the image pattern, if the multiple symbol is detected, sending pattern data corresponding to the multiple symbol to the display unit in the number indicated by the multiple data. This is a display control method characterized by: As described above, the present invention aims to reduce the display memory capacity by providing an image pattern in which a dot pattern is encoded in a bit map display.

(e) Examples of the invention The present invention will be explained below with reference to the drawings. FIG. 1 is a block diagram illustrating the present invention. Figure 1a
As shown in the figure, by sending the image data G (dot data) from the display memory 1 to the display unit 2,
An image of a dot configuration is displayed on the screen. The screen is
Although n unit images G ₁ to _{G o} are displayed, each unit image is composed of 80 dots in total, 8 dots vertically and 10 dots horizontally. Figure 1b is a unit image
FIG. ₁ is a data block diagram of G1. The hatched positions in FIG. 1b indicate the displayed portions.
In the conventional method, even when performing such a display, 8×10 bits were required as an image (dot) pattern memory. The present invention aims to reduce the capacity of the display memory 1 by structuring the image data of the unit image _G1 shown in FIG. 1b into a coded image pattern _P1 as shown in FIG. 1c. It is. The pattern is encoded in the following manner. In Fig. 1b, the area B ₁ (b ₀ to b ₃ ) and the area B ₂ (b ₄
~ _b7 ) and coded separately. Area B ₁ in column D ₁
In , the hatched parts are rows b ₁ , b ₂ and b ₃ , so these are stored as hexadecimal code "E" in the term L of address An of image pattern P ₁ in Figure 1 c. do. Note that the shaded area is "1", the blank area is "0", the bit b0 side is the lower digit, and the bit b7 side is the upper digit. Also, in area B ₂ of column D ₁ , only row b ₄ is shaded, so this is 16
The image pattern P ₁ in Figure 1 c is set as the hexadecimal code "1".
is stored in the term U of address An. In addition, in column D ₂ , only rows b ₃ and b ₄ are shaded, so the terms L and U of address A _o+1 of image pattern P ₁ in FIG. and "1" are stored. In columns D ₃ to _{D 6} in FIG. 1b, only rows b ₃ and b ₄ are shaded like column D ₂ , so
In this case, a multiplication sign (x) is stored in the term U of the address A _o+1 of the image pattern P ₁ in FIG. 1c, and numerical data "4" is stored in the term L. However, the multiplication symbol is defined as a code that does not appear as data.
Through this encoding process, the unit image G ₁ (10 bytes) shown in FIG. 1b is encoded into the image pattern P ₁ (6 bytes) shown in FIG. Stored. Therefore, the capacity of display memory 1 can be reduced.

FIG. 2 is a block diagram illustrating an embodiment of display control according to the present invention. In Figure 2, Figure 1b
A command code g ₁ is issued from the control device 3 to instruct output display of the unit image G ₁ shown in FIG. Control unit 4
retrieves the image pattern P ₁ corresponding to the command code g ₁ from the display memory 1. After that, first take out the data ("E" and "1") of the terms L and U of the address A _o of the image pattern P ₁ and store it in the register 5.
Set to . The register 5 is divided into an upper part R _U and a lower part R _L , and data "1" is stored in the upper part R _U.
However, data "E" is also set in the lower part R _L. The determining unit 6 checks whether the data in the upper part R _U of the register 5 is a multiplication symbol (x). If it is not a multiplication sign (x), the data in register 5 (upper part R _U and lower part _RL ) is transferred to register 7. On the other hand, when it is a multiplication sign (x), the discriminator 6 issues the control signal _C2 , sets the data in the lower part R _L of the register 5 to the down counter 8, and activates the transfer unit 9. . The transfer unit 9 issues a transfer signal S to send the data in the register 7 to the conversion unit 10. Register 7 at this time
The data in register 5 (e.g. address
The data at address A _o-1, which is one address before A _o ), is stored. Furthermore, every time the transfer unit 9 issues the transfer signal S, it issues a pulse F to increase the value of the counter 8 by 1.
It decreases by one. When the value of the counter 8 reaches "0", a termination signal H is issued and the transfer section 9 is stopped.
Therefore, the data in register 7 will be sent to converter 10 the number of times equal to the value set in counter 8. The converter 10 converts the data sent from the register 7 into the unit image shown in FIG.
Since the image is converted to _G1 , the specified image is displayed on the display section 2 in a dot configuration. Note that FIG. 3 is a flowchart showing an overview of the above operation.

(f) Effects of the Invention As described above, the present invention has the advantage of significantly reducing the capacity of display memory.

[Brief explanation of the drawing]

FIG. 1 is a block diagram explaining the present invention, FIG. 2 is a block diagram explaining one embodiment of the present invention, and FIG.
The figure is a flowchart for explaining one embodiment of the present invention, and the symbols used in the figure are as follows. 1 is a display memory, 2 is a display section, 3 is a control device,
4 is a control unit, 5 and 7 are registers, 8 is a counter,
9 is a transfer unit, 10 is a conversion unit, A _o , A _o+1 , A _o+2 ,
A _o+3 , A _o+4 , A _o+5 are addresses, B ₁ and B ₂ are areas,
bJ, b ₁ , b ₂ , b ₃ , b ₄ , b ₅ , b ₆ , b ₇ are rows, C ₁ , C ₂ are control signals, D ₁ , D 2 , D ₃ , D ₄ , _{D 5 ,} D ₆ , _D7 , _D8 ,
D ₉ , D ₁₀ are columns, E is hex code, F is pulse, G
is image data, G ₁ , G _o are unit images, g ₁ is command code, H is end signal, L, U are terms, P ₁ , P _o are image patterns, R _L is lower part of register, R _U is Shows the upper part of the register.

Claims (1)

[Scope of Claims] 1. A display unit comprising a display unit, a display memory for storing image data to be displayed on the display unit, and a control device, and a rectangular image with the number of pixels of M dots vertically and N dots horizontally as a unit image. In a device that displays on a display unit, as a storage method for the unit image data in the display memory, when the pattern of M bits in a vertical column is different from the pattern of M bits in the previous column, L-digit hexadecimal data is stored. (However, Lx4 = M and L is an integer of 2 or more) and when the pattern of M dots in the vertical direction is the same as the pattern of M bits in the previous row, the number of times the same pattern continues is A specific symbol indicating the number of consecutive times of the same column pattern is attached and stored as one column of data, and as a reading method for the unit image data in the display memory, one column of data is sequentially read out, and the data is If the data does not include a symbol, it is sent as is to the display section, and if the data includes the above specific symbol, the L-digit hexadecimal data that was read immediately before is sent consecutively as many times as the specific symbol is attached. A display control method characterized by transmitting data to a display unit.