JPS59129895A - Display for portable small electronic equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] It is something that

2. Description of the Related Art Conventionally, display devices for small portable electronic devices have been used with a display device of about one to four lines because of their small size or thin profile. Therefore, it is not possible to display much information for editing or comparing, which may lead to incorrect operations or judgments. In addition, displays other than character displays, that is, graph ink displays, cannot be realized in displays for small portable electronic devices because the number of lines and digits are extremely small.

In order to eliminate the above-mentioned drawbacks, the present invention uses two character generators in a display device for portable small electronic devices, and normally only one of them is used (large display and only one line). If you want to display the human-generated data more clearly, and then know the preceding, following, or all of the human-generated data, send a command from the computer to the drive device and send it to the other character generator. By switching, about 10 to 25 lines are displayed on the same display.

In this case, although the characters on the display are smaller, the entire information can be seen and the information can be easily compared and edited.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the display device for portable small electronic equipment according to the present invention.
1, a driving device 20, and a display device 10.

A refresh memory 2 stores data to be displayed from the CPU 1 through a data bus 11.

This data is transferred from the fresh memory 2 to the first character generator 4 which displays uppercase letters in one line as character data at a certain timing by the timing controller 2, or to the second character generator 5 which displays the previous, previous, or all characters. is input. Dot data, that is, pixel data is output from the first or second character generator 4 or 5, and the data is passed through the parallel/serial conversion circuit 8 to the video signal generation circuit. is input to. In the video signal generation circuit 9, the pixel data is synchronized with the horizontal signal and the vertical signal through the synchronization signal generation circuit 6. Further, the display range is controlled by a screen control circuit 7.

Figure 2 shows an example of the display when using the first character generator, and Figure 3 shows an example of the display when using the second character generator. In this case, the switch 12 is activated by a command from Cpul to the driving device 20, and the first character generator 4 is selected.

Among the contents of the refresh memory 2, the newest input data is displayed within the range that can be displayed horizontally on the display 10. Further, when displaying data before and after data or a large amount of data as shown in FIG. 3, the switch 12 is actuated by a command from the CPU to select the second character generator 5.

In this case, although the pixels become finer, the entire contents of the fresh memory 2 are displayed.

As is clear from the above explanation, according to the device of the present invention, there are two cases: when the characters are displayed thickly (clearly), and when the pixels are fine but the data is displayed before and after or all of the data, or when it is displayed graphically. Two IU hydraulic methods can be performed on the same display device according to computer instructions, which has the effect of being widely used as a display device for small portable electronic devices.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the display device for portable small electronic devices of the present invention, and FIGS. 2 and 3 show display examples when using the first and second character generators, respectively. It is an explanatory diagram. 1-cpu, 2 refresh memory, 6 timing controller, 4 first character generator, 5... second character generator, 6... synchronization signal generation circuit, 7-... screen control circuit, 8 - parallel/serial i power supply circuit, 9 video signal generation circuit, 10... display, 11... data bus, 12... switch, 20 - drive device. Figure 3

Claims (2)

[Claims] (1) In a display device for a small portable electronic device, the components of the display device for a small portable electronic device include a RAM that stores information to be displayed, a first character generator that converts characters into characters, and a second character generator that converts characters into characters. It consists of a character generator, a switch that prevents the two character generators from being used separately, a parallel/serial conversion circuit, and a synchronization signal generation circuit, and these driving devices are connected to the CPU by a data bus. A display device for a small portable electronic device, characterized in that it gives information to be displayed on a data bus or a command to the drive device. (2) The switch can be switched to one of two character generators by a command from the CPU, and can display uppercase don't data or lowercase don't data. The display device for a small portable electronic device according to item 1.