JPS61130984A - Display controller - 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 [Technical Field of the Invention] The present invention relates to a display control device suitable for use in a display system in which software is standardized for frame-shaped display and monochrome display.

[Technical overview of the invention and its problems]

Recently, the number of office automation devices/equipments that have graphical functions has increased, and along with this, the importance of color CRTs, which play an important role in man-machine ink, is increasing. On the other hand, it is also important to reduce the price of office automation equipment, and for this reason, not only relatively expensive color CRTs but also monochrome CR'l' are available.

1. Monochrome CRTs are different from the conventional two-tone CRTs, and are increasingly becoming multi-tone CRTs. Usually, the number of gradations is 8, and each gradation corresponds to a fixed display color of 8 colors.
The software for T and monochrome CiT has been standardized.

However, since there are 8 gradations for brightness, in practice,
This brightness difference is too much for human vision to clearly perceive. It is practically impossible to display a screen unless eight gradations are used at once and the difference in luminance between each gradation display is determined.

On the other hand, even though software that is designed with CRT in mind may be called wear, the reality is that in business use there are few cases in which all eight colors are used at once5, and most cases use four or fewer colors. . However, even if a small number of colors are displayed, if the brightness of the monochrome CRT corresponding to the color is adjacent to each other, the monochrome CRT with gradation will be displayed.
Display at RT is not preferable for the reasons mentioned above.

As a solution to the above case, when creating software, you should be conscious of using color types whose gradations do not match. However, placing restrictions on the colors that can be used also half-kills the advantages of color CRTs. The present invention is a color CRT software and a monochrome CRT with gradation.
The present invention relates to a practical method for making the display on a monochrome CRT with gradation easier to see when the same software is used.

[Purpose of the invention]

, The non-explosion was done in view of the circumstances mentioned above.
Ah, ゛Display content designed primarily for display on color monitors is displayed on a monochrome CRT with gradation, V! - It is an object of the present invention to provide a surface control device that facilitates changing the displayed contents when displayed. - [Summary of the Invention] In order to achieve the above-mentioned object, the present invention provides a display device of this type that uses color information and luminance information between a conventional memory circuit and a gradation monochrome lambda display signal generation circuit. A data conversion circuit was added to store the correspondence relationship between the two. The contents stored in this data conversion circuit can be arbitrarily rewritten by the CPM, and the converted contents are supplied to the gradation monochrome display signal 1 generation circuit.

In this way, by making the correspondence between the color types of the single color display and the brightness of the gradation monochrome display variable, it is possible to improve the visibility of the display.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described in detail using the drawings. FIG. 1 is a block diagram showing an embodiment of the non-explosion rj+, and only the parts related to the present invention are extracted and shown.

In the figure, reference numeral 11 denotes a control unit (CPU) consisting of a microphone processor, main memory, etc., which controls the entire apparatus. 12 is a CRT control circuit (CRTC), which is commercially available L8I>! used. 13 to 5 are video RAMs. Video RAM 13 to f5 correspond to the three primary colors of display: Red, Green, and Blue K.
Each display data is held, and arbitrary display data is written by the control section 11. 16 is a gradation video signal generation circuit. Video signal generation circuit with gradation 16
is used to supply a gradation video signal to a monochrome CRT (not shown) via a connection 18. Reference numeral 17 indicates a connection portion with a color CRT (not shown).

19 is a data conversion circuit added according to the present invention.

The data conversion circuit 19 is provided for the purpose of arbitrarily changing the correspondence between the types of colors in the color display and the gradations in the monochrome display with gradation. You can change relationships. Internally, it is composed of a table memory that allows R@ad/Write of correspondence relationships.

Hereinafter, the operation of the embodiment of the present invention will be explained in detail.

First, the control circuit 11 instructs the CRT control circuit 12 to
After setting the parameters necessary for T control 1, write the display data to Bi f"2 FRAM13.14.15.CR
If T is a color monitor, video RAM 13, 14 .
15 output is supplied to a color monitor (not shown) via a color 〇R'l' connection 17. Usually, the three primary colors of color are R (Red), G (Gr@en), B (B
1) is sent as an output to a CRT monitor to display the desired color.

If the CRT monitor is a monochrome CRT with gradation, the outputs of the peer-o-RAMs 13, 1-4, and 1.5 are converted into a video signal with gradation by the video signal generation circuit 16 with gradation, and the monochrome CRT connection section, The signal is sent to a monochrome CRT (not shown) via 18, and a monochrome display with a desired gradation is performed.

Colors normally displayed on color CRT and monochrome CR
The relationship with the brightness when TK is displayed is fixed, and -
An example is shown in Table 1 below.

(Table 1) Note that the brightness is set to a high brightness of 7 to 00 JlIK.

As mentioned above, the present invention is characterized by the addition of the data conversion circuit 19.

That is, the control circuit 1 can arbitrarily change the input/output relationship by accessing this circuit. Here, since the outputs of the video RAMs 13 to 15 are converted and input to the gradation video signal generation circuit 16, the relationship between color and brightness can be arbitrarily varied.

For example, if a conventional color display using only four colors, black, red, green, and yellow, is displayed on a monochrome CRT,
In the above correspondence example (Table 1), since the luminances are all the same (0.1, 2.3), the display is not easy to understand. However, in the present invention, the correspondence between color and brightness can be changed, for example, as shown in Table 2 below, so that visibility is improved even in monochrome display. In this example, the difference in luminance corresponding to the four colors is 2 or more.

(Table 2) In the embodiments of the present invention, only an example using the display device K CRT was shown, but it can also be applied to other devices capable of color display, and display devices in general that can add gradation although monochrome display. It is possible.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to make the correspondence between the types of colors in the color display and the brightness of the gradation monochrome display variable, thereby improving the legibility of the K-Yoshi display. and easy to identify.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention. 11... Control circuit (CPU), 12 CRT control circuit (CRTC'), 13, 14.15... Video shift M116... Video signal generation circuit with gradation, 19...
Data conversion circuit. Applicant's agent Patent attorney Takehiko Suzue 1st decoy

Claims (1)

[Claims] a memory circuit that holds display information to be supplied to the display device;
A color display signal generation circuit that converts the memory information held by this memory circuit into a signal for color display, and a gradation video signal generation circuit that converts the memory information held by the memory circuit into a signal for monochrome display with gradation. a signal generation circuit; a data conversion circuit that is located between the storage circuit and the gradation video signal generation circuit and arbitrarily associates the color information and gradation information generated and outputted by these circuits; A display control device comprising: a control circuit that performs desired display control by updating and referencing the contents of the data conversion circuit.