JPH0387920A - Computer display device - 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 [Field of Industrial Application] The present invention relates to a display device for a computer whose display mode can be selected between a normal display mode and an inverted display mode, and particularly relates to a display device for a computer in which the display mode can be selected between a normal display mode and a reverse display mode. The present invention relates to a display device suitable for computers (microcomputers), etc.

[Conventional technology]

In personal computers and microcomputers, the display mode of the display device has traditionally been, for example, for black and white display, the brightness is set to a predetermined value in response to display data "1", and the brightness is set to O in response to display data "0". In addition to the so-called normal display mode, which displays
There is also known a model in which a so-called reverse display mode can be selected, in which brightness O is given in response to display data "1". At this time, if the color display device is used, in the inverted display mode, the display is performed in a complementary color to the color of the given display data.

By the way, in conventional devices of this type, selection of the display mode is performed by hardware settings such as keyboard operations. -44693 and Japanese Patent Laid-Open No. 55-57943.

[Problem to be solved by the invention]

In the above conventional technology, no particular consideration is given to the display mode selection process from the computer software side, and therefore, from a software perspective, the display is always displayed in the display mode that is easier to see. The problem was that this was not always the case.

In other words, in the prior art, the selection of the display mode by the display device is limited to hardware processing based on the operation of switches and keyboards by the operator, and it is not possible to select and switch the display mode based on a request from the computer software. During program processing, even if it is determined that it would be easier for the operator to see the display mode at that time based on the displayed content at that time, the operator may need to perform the specified keyboard operation to do so. , it is necessary to perform a display mode selection operation, which poses a problem in that the display mode selection function cannot be fully utilized.

An object of the present invention is to automatically select the optimal display mode from the viewpoint of computer software, to make full use of the display mode selection function, and to easily select the display mode that is easier for the operator to view. An object of the present invention is to provide a display device for a computer.

[Means to solve the problem]

The above object is to provide a signal processing means that generates a predetermined control signal based on accesses generated by computer program processing, and to use either the control signal from the means or the signal generated by the hardware display mode selection input operation. This is also accomplished by executing display mode selection.

[Effect]

The above-mentioned signal processing means outputs a predetermined signal, that is, a software side selection signal, when accessed by a computer program, so just by writing a predetermined command in the program, the optimum signal is always automatically selected. A display mode is selected, and a display operation in an easy-to-see display mode can be easily obtained.

〔Example〕

Hereinafter, 1 regarding the computer display device according to the present invention.
This will be explained in detail with reference to the illustrated embodiment.

The figure shows an embodiment of the present invention, in which the present invention is applied to a flat display device such as a liquid crystal display device. In the figure, 1 is a data inversion circuit, and the display data from the display data bus 2 is A predetermined display operation is performed by taking out the data from the data inverting circuit 1 as a display data output 3 and supplying it to a flat display device (not shown).

As shown in the figure, this data inversion circuit 1 consists of a predetermined number of EXOR gates, so that the inversion signal R is "O".
When , the data from the display data bus 2 appears as is at the display data output 3, while the inverted signal R is "
1" is input, the data "1" and "0" from the display data bus 2 are inverted and appear on the display data output 3, and this causes display operation in normal display mode and reverse display mode. You can select the display operation according to the following.

Reference numeral 4 denotes an inverting register, which is composed of flip-flops as shown in the figure, and serves to set and hold the Q output as an inverted signal R.

The setting of this inversion register 4 is determined by the inversion switch 5.
The inverted switch signal (hardware side selection signal) R8 generated from the chattering removal circuit 6 and the AND circuit 7
This is done using the inverted clock signal RCK which is the output of the OR circuit 8 which receives the output signal (soft side selection signal) as input, and the data input at this time is taken in. In addition, the system reset signal R3 is supplied to the clear manual CAL, and as a result,
When the device is started up, the normal display mode is set as an initial setting.

Here, the reversing switch 5 is composed of a predetermined key specified in advance on the computer keyboard, or an appropriate switch provided separately, and is operated when the operator intends to select the display mode. This is how it is.

Reference numeral 9 denotes an address decoder, which receives address bus data A given from computer software and outputs a decoded signal Dec, which is input to the AND circuit 7 together with a write signal W also given from the software.

Reference numeral 10 denotes a selector, which, as shown in the figure, consists of two AND gates, one inverter each, and an OR gate, and serves to switch the data input to the inverting register 4 in response to a decode signal Dec.

When the decode signal Dec is O”, the inversion register 4
Input the Q par output of
When ec is "O", it operates to input the lower signal DA6 of the data bus supplied from the computer software to the data output of the inverting register 4.

11 is a buffer gate, which receives the read signal R○ and the decode signal Dec supplied from the software;
Controlled by the output signal of the ND gate 12, the inverted signal R
is input to the software side as a display state read signal D11.

Reference numeral 13 denotes an indicator consisting of a light emitting diode or the like, which emits light when the inversion signal R is "1" to indicate that the display is currently in the inversion display mode.

Next, the overall operation of this embodiment will be explained.

First, in terms of hardware, the reversing switch 5 is operated by the operator.
The display mode is selected by the operation. That is, when the reversing switch 5 is operated, as described above,
Inverted switch signal R5 via chattering removal circuit 6
is generated, and as a result, an inverted clock signal RCK is input to the inverted register 4. On the other hand, at this time, since there is no access from the computer software, the decode signal is at level "0", and therefore, the data output of the inverting register 4 is supplied with the Q bar output.

Therefore, at this time, the level of the inverted signal R is switched and set to the opposite level to the level immediately before, and after all, at this time, every time the inverted switch 5 is operated, the level of the inverted signal R is set alternately from "0" to "1" and then from "1' to "0", and as a result, the display mode on the flat display is alternately selected between normal display mode and reverse display mode. will be done.

Next, if a predetermined command is written in the computer program as described above, access from the software is performed by executing this command, and address bus data A and write signal W are is supplied.

As a result, the D output of the inversion register 4 is set by the lower signal DAo of the data bus at this time, and either the normal display mode or the inversion display mode is selected. That is, at this time, unlike the case of selection by the inverting switch 5, the display mode is not switched alternately, but the lower signal DAO of the data bus at that time is
It will be set according to the state of.

Therefore, according to this embodiment, by writing a predetermined command in a computer program, the optimal display mode is automatically selected from the software's perspective, so that the operator can always select the display mode that is easier to view. The display mode can be easily assigned, and the display mode selection function can be fully utilized.

According to this embodiment, an inversion register 4 is provided, which maintains the currently selected and set display mode, so that the last display mode up to the present time is always maintained. Priority is given to the input settings and the display mode is selected.

Next, in this embodiment, it is possible to read which display mode is currently selected from the software side.

As mentioned above, address bus data A and read signal R
By inputting O from the software side, AND
This is made possible by the output of the gate 12 opening the buffer gate 11 and the inverted signal R being output as the display state reading signal Di, and by reading this signal from the software side. At this time, if the decode signal Dec by the address bus data A is made to be the same at the time of selecting the display mode and at the time of reading,
One type of address is sufficient.

Further, in this embodiment, when the inverted display mode is set as the display mode, the indicator 13 emits light, so that the operating state can be easily recognized and confirmed.

In the above embodiments, the case of monochromatic display such as black and white image display was explained, but the present invention may be applied to the case of color display using three colors of RGB, and in this case,
As mentioned above, it goes without saying that complementary colors are displayed in the reverse display mode.

Furthermore, it goes without saying that the present invention is applicable not only to flat display devices such as liquid crystal display devices, but also to display devices such as CRTs, as described above.

〔Effect of the invention〕

According to the present invention, the screen display mode can not only be selected by hardware processing by operating a switch, but also
It can be easily and easily executed by simply setting a specific address from the computer software side.
Viewed from the software, the image display that is easier for the operator to view between the normal display mode and the reverse display mode is arbitrarily and automatically selected, allowing comfortable computer operation.

[Brief explanation of drawings]

The figure is a circuit diagram showing an embodiment of a computer display device according to the present invention. l...Data inversion circuit, 2...Display data bus, 3...Display data output, 4...
...Reversing register, 5...Reversing switch, 6.
...Chattering removal circuit, 9...Address decoder, 10...Selector, 13...
···indicator.

Claims (1)

[Claims] 1. The display operation can be performed by arbitrarily selecting each of the normal display mode and the reverse display mode under the same display data using a hardware-side selection signal generated in response to a display mode selection input operation. In a display device for a computer that is possible to use, a signal processing means is provided for generating a predetermined software selection signal based on an access generated by computer program processing, and the software selection signal and the hardware selection signal can be used to generate the above selection signal. A display device for a computer, characterized in that it is configured to select between a normal display mode and a reverse display mode. 2. In the invention of claim 1, a register is provided to sequentially hold the selection states of the normal display mode and the reverse display mode by both the software side selection signal and the hardware side selection signal, and the current display mode is 1. A display device for a computer, characterized in that the display device is configured to be determined based on a signal input last to the computer. 3. A display device for a computer according to claim 2, further comprising data output means for outputting the selected state of the register based on an access generated by computer program processing. 4. The computer display device according to claim 1, wherein the display mode selection by the display mode selection input operation is a sequential reversal selection of a normal display mode and a reverse display mode. . 5. A computer display device according to claim 2, further comprising an indicator that operates according to data held in the register.