JPH01319788A - Display device with display direction inverting function - Google Patents

Abstract

PURPOSE:To enable an operator to confirm the contents on a display screen mutually with an opposite person without any troublesome operation by providing a display-direction inverting means which inverts the contents of a display screen memory. CONSTITUTION:A CPU and the output terminal of a memory part 11 are normally; connected to a drive 12, a dot pattern from the memory part 11 is written on the display screen memory 12 in the direction that the operator can reads the dot pattern normally, and the contents of the memory 13 are displayed on a liquid crystal display element 18 through a control part 17. Then when a changeover switch 16 is switched from a contact (a) to a contact (b) through the operation of a display-direction inversion key 19, the output terminal of the memory part 11 is connected to a driver 14. Consequently, the driver 14 converts the dot pattern from the memory part 11 so that the display direction is inverted and writes the dot pattern on a display screen memory 15, whose contents are displayed on the element 18 through the control part 17. Then the dot pattern is displayed on the element 18 through the memory 15 and control part 17 in the direction where the opposite person can read it normally.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a display device with a display direction reversing function, which is used in a battery-powered portable data terminal or the like, and has a function of reversing the display direction by 180 degrees.

Conventional technology In the past, display devices used in battery-powered portable data terminals used communication functions to capture data entered from the keyboard and from an external data processing device, etc., and store it in memory. It was common practice to format data, such as data processed by an internal microcomputer, into a format that was easy for the operator to view, and to display it on a dot matrix using a liquid crystal display element.

FIG. 1 is a block diagram of a display device using this liquid crystal display element. As shown in FIG.
A PU and memory unit 1, a character generator 2 that develops data processed by the computer into a dot pattern for display, and a display screen in which the dot pattern for display outputted from the CPU and memory unit 1 is stored. The configuration includes a memory 3 and a control section 4 that drives a liquid crystal display element 5 having a dot matrix configuration via drivers 6a and sb while referring to the display screen memory 3, The dots are blinking to display predetermined data.

Problems to be Solved by the Invention However, in the above-mentioned conventional display device, the dot pattern developed from the character generator is developed in advance on the assumption that the dot pattern is viewed in the correct direction from the operator, and the dot pattern is developed in advance on the premise that the dot pattern is viewed in the correct direction from the operator. It was inevitable that the displayed characters would be seen in reverse from the person facing the user.

Furthermore, this type of display device used in conventional portable data terminals is generally small, with alphanumeric and kana characters of 2 lines x 10 characters, and the displayed characters are reversed. Even if it seems like it is, it doesn't feel like much of an inconvenience, or it was not necessarily necessary to begin with.

However, as this type of display device becomes larger and requires displaying kanji characters of about 8 lines x 30 characters, and moreover, as it becomes more common to view from both sides while operating, it becomes easier to see data terminals. The process is often interrupted and inefficient, as the other side often has to rotate the
There is also a problem that processing operations are complicated.

The present invention solves these conventional problems,
It is an object of the present invention to provide a display device with an excellent display direction reversing function that allows the display direction to be reversed only by an operation from a keyboard.

Means for Solving the Problems In order to achieve the above object, the present invention reverses the reading direction of character data displayed on a liquid crystal display element by 180 degrees based on the operation of a display direction reversal key provided on a keyboard section. The apparatus is equipped with a display direction reversing means for reversing the contents of the display screen memory by 180 degrees so as to cause the display screen to change.

Therefore, according to the present invention, by pressing the display direction inversion key, the display that normally appears correctly to the operator is reversed 180 degrees to the direction that can be read correctly by the person facing the person, and the results of subsequent operations are The display is displayed in a direction that can be read correctly by the person facing the person, and when the display direction inversion key is pressed again, the display is reversed 180 degrees in a direction that can be read correctly by the operator, and the results of subsequent operations are displayed in a direction that can be read correctly by the operator. This has the effect of greatly improving usability.

Embodiment FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In FIG. 1, 11 is a CPU and memory section, 12
14 is a driver composed of software that writes the dot pattern from the CPU and memory section 11 into the display screen memory 13 in a direction that allows the operator to read it correctly, and 14 allows the dot pattern from the CPU and memory section 11 to be read correctly by the person facing the device. A driver consisting of software that writes to the display screen memory 15 in the direction possible; 16 is a CPU and memory unit 11;
17 is a control section that drives a liquid crystal display element 18 having a dot matrix configuration; 19 is provided on a keyboard section 20; This is a display direction inversion key.

The liquid crystal display element 18 may be configured to have a double-sided display so that it can be viewed by the operator and the person facing the person, or may be provided separately for the operator and the person facing the person facing the person.

Next, the operation of the above embodiment will be explained. In the above embodiment, the output end of the CPU and memory section 11 is usually connected to the driver 12, and the dot pattern from the CPU and memory section 11 is written in the display screen memory ratio in a direction that the operator can read correctly, and the dot pattern is displayed. The contents of the screen memo January 3 are displayed on the liquid crystal display element 18 via the control unit 17 as shown in FIG. 2(a).
Display as shown. In this case, the driver 12
Every time there is a command to operate the screen from U and the memory unit 11, it is activated by a software interrupt command and operates the display screen memo 3.

When the changeover switch 16 is switched from contact a to contact a based on the operation of the display direction inversion key 19, the output terminals of the CPU and memory section 11 are connected to the driver 14. For this reason, the driver 14 converts the dot pattern from the CPU and memory section 11 so that the display direction is reversed and writes it into the display screen memory 15.
The contents are displayed on the liquid crystal display element 18 via the control section 17. Thereafter, through the display screen memo 1J15 and the control unit 17, it is displayed on the liquid crystal display element 18 in the direction shown in FIG. 2(b) so that the person facing the meeting can read it correctly.

When the display direction reversing key 19 is operated again and the changeover switch 16 is switched from contact to a, the display returns to the display that can be read correctly by the operator as shown in FIG. 2(a).

As described above, according to the above embodiment, the display direction reversing key 19
Each time you operate the , the display can be switched between the direction that the operator can read correctly and the direction that the person facing you can read correctly, and the display direction can be switched between normal, reversed, normal, reversed, etc. have

FIG. 3 is a block diagram of main parts showing another embodiment of the present invention, in which two drivers 22 and 23 are provided for one display screen memory 21.

To invert the contents of the display screen memory 21 according to the display direction, for example, prepare a small-capacity buffer memory integrated with the driver 22, 23, and invert the contents of the display screen memory 21 via the backup memory. I do. therefore,
This embodiment has the advantage that it can be realized with about half the capacity of the display screen memory compared to the previous embodiment which requires a huge capacity of display screen memory.

Effects of the Invention As is clear from the above embodiments, the present invention enables the display direction on the display screen to be rotated 180 degrees by simply operating the display direction reversal key provided on the keyboard, which eliminates the need for complicated operations. This has the effect that the operator can mutually check the contents of the display screen with the person he/she is meeting without handling the screen.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram showing a display device with a display direction reversal function according to an embodiment of the present invention, FIG. 2 is a display state diagram when the display direction is reversed in the display device of the present invention, and FIG. A schematic block diagram showing a display device with a display direction reversal function in another embodiment, and FIG. 4 is a schematic block diagram of a conventional display device. 11...CPU/memory unit, 12...Character generator, 13. 15...Display screen memory, 1
6...Display direction reversal means (switch switch), 17.
...Control unit, 18...Liquid crystal display element, 19...Display direction reversal key. Name of agent Patent attorney Satoshi Nakao and one other person Figure 1 Figure 2 <a) 〆b) 3 Figure Figure 4 Otsu θ-S /,・' 2 /

Claims (1)

[Claims] A CPU and a memory unit connected to a character generator that develops data into a display dot pattern, a display screen memory that stores the display dot pattern output from the CPU and memory unit, and this display screen. a control unit that drives a liquid crystal display element having a dot matrix configuration while referring to a memory for reading character data displayed on the liquid crystal display element based on the operation of a display direction inversion key provided on a keyboard unit; 1
A display device with a display direction reversing function, comprising display direction reversing means for reversing the contents of the display screen memory so as to reverse the contents by 80 degrees.