JPS61129689A - Display unit - 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 device for displaying a binary image used, for example, in an image file device.

[Technical background of the invention and its problems] Conventionally, in a display device that displays a binary image used in an image file device, etc., a cursor that indicates a position on the screen, etc. is usually used to invert the content on the screen. It is used as In such a device, the cursor in the white part is black and the cursor in the black part is white, so it can be easily distinguished. On the other hand, there is a drawback in that it is difficult to identify the above-mentioned cursor in images such as newspapers where black and white are frequently inverted.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its object is to provide a display device in which a cursor can be clearly identified regardless of the displayed content on the screen.

[Summary of the Invention] In order to achieve the above object, the present invention specifies a readout address of a refresh memory that sequentially outputs one screen worth of image information by an addressing means, and the readout address and the cursor address by the addressing means are specified. When the comparison results match, a cursor display signal is output, and this cursor display signal causes an inverted signal and a non-inverted signal to be arranged in a matrix in accordance with the read address by the address specifying means. Outputs an inverted signal or a non-inverted signal read out from the matrix table stored in the matrix table corresponding to the read address by the addressing means at this time, and combines this output signal with the image signal read out from the refresh memory. The exclusive OR is calculated and the output signal from this exclusive OR is displayed.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic configuration of a display device of the present invention used in an image file device. That is, reference numeral 1 denotes a refresh memory that stores binary image information for one screen supplied from a main control section (not shown) of the image file device. Reference numerals 2 and 3 denote a vertical counter and a horizontal counter, respectively, which designate the read address of the refresh memory 1. The address signals of the vertical counter 2 and horizontal counter 3 are the refresh memory 1 and comparison circuit 4.
and is supplied to the matrix table 5 (however, the lower 1 bit). The comparison circuit 4 compares the address of the cursor C supplied from the main control section with the addresses of the vertical counter 2 and horizontal counter 3, that is, the read address of the refresh memory 1, and when they match, the cursor display signal is This outputs the following. The cursor C is specified to have a width of a plurality of bits (for example, 4 bits). The cursor display signal from the comparison circuit 4 is supplied to the matrix table 5.

As shown in FIG. 2, this matrix table 5 stores an inversion pattern in which an inversion signal and a non-inversion signal are arranged in a 2×2 pixel matrix, and is made up of, for example, a ROM. There is. The table reading position in the matrix table 5 is determined by the address signal from the vertical counter 2 (lower one of the actual address signal).
(bit) and the address signal from the horizontal counter 3 (lower one bit of the actual address signal). For example, from vertical counter 2 “O
”, “0” is supplied from the horizontal counter 3, “1” is supplied from the vertical counter 2, and “1” is supplied from the horizontal counter 3.
” is supplied, reads “1” as an inverted signal,
"O" from vertical counter 2, "1" from horizontal counter 3
is supplied, and "1" from vertical counter 2,
When "0" is supplied from the horizontal counter 3, rOJ is read out as a non-inverted signal. When the matrix table 5 is supplied with the cursor display signal, it outputs an inverted signal or a non-inverted signal read out corresponding to the address. The inverted signal or non-inverted signal from the matrix table 5 is supplied to an exclusive OR circuit 6.

This exclusive OR circuit 6 performs an exclusive OR operation on the image signal read out from the refresh memory 1 according to the address signal and the inverted signal or non-inverted signal from the matrix table 5, and performs the exclusive OR operation. It outputs the results. The signal from the exclusive OR circuit 6 is supplied to the image display section 7. This image display section 7 displays a binary image in response to the signal from the exclusive OR circuit 6, and is composed of, for example, a CRT display device. Therefore, when the cursor C is in a white area, as shown in FIG. It is now displayed as . Further, when the cursor C is in a black area, as shown in FIG. 4, it is displayed in a houndstooth pattern different from that in a white area.

Next, the operation in the above configuration will be explained. For example, one screen's worth of binary image information is now stored in the refresh memory 1. Then, according to address signals from the vertical counter 2 and the horizontal counter 3, image signals are sequentially output pixel by pixel to the exclusive OR circuit 6. Further, the address signal is compared with a cursor address from a main and sub-phloem (not shown) in a comparator circuit 4. As a result of this comparison, only if they match, a cursor display signal is output. Further, the table reading position in the matrix table 5 is designated by the lower one bit of the address signals from the vertical counter 2 and horizontal counter 3. This results in
When the cursor display signal is supplied from the comparator circuit 4 to the matrix table 5, one of the inversion patterns specified for reading at this time, that is, the inversion signal "1" or the non-inversion signal rOJ, is exclusive from the matrix table 5. It is output to the OR circuit 6. Therefore, the exclusive OR circuit 6 receives the non-inverted signal - from the matrix table 5.
is supplied, the image signal for each pixel from the refresh memory 1 is output as is to the image display section 7, and when an inverted signal is supplied from the matrix table 5, the image signal for each pixel from the refresh memory 1 is output as is. Each image signal is inverted and output to the image display section 7.

As a result, when the cursor C is in the white area, as shown in Figure 3, the inverted pixel a and the non-inverted pixel 2 are displayed in a 4-bit width arranged in a houndstooth pattern, that is, visually it is a halftone. is displayed. Also, if cursor C is in the black area,
As shown in FIG. 4, the white area is displayed in a different houndstooth pattern.

As mentioned above, by displaying the cursor in midtones, when the surrounding area is black, the cursor is displayed in a light color, and when the surrounding area is white, the cursor is displayed in a dark color, making it possible to clearly identify the cursor. .

In the embodiment described above, the width of the cursor is 4 bits, but the width is not limited to this and may be a plurality of pits other than 4 bits. Further, although inverted pixels are used, the present invention is not limited to this, and a white and black pattern as shown in FIG. 3 may be displayed regardless of image information.

Also, the inversion pattern was composed of 2x2 pixels,
The matrix is not limited to this, and other matrices such as 2×4 pixels may be used. In this case, the lower two bits of the address signal are used to specify the read position of the table. Further, the reversal pattern may be a reversal pattern that makes use of image information, for example, a reversal pattern with many reversed pixels as shown in FIG. 5, or a reverse pattern with few reversed pixels as shown in FIG. 6. . As a result, when the inversion pattern shown in FIG. 5, which has many inverted pixels, is used, white parts become blackish and black parts become whitish, as shown in FIG. 7. This results in slightly stronger contrast when the surroundings are pure white or black. Also,
When the inversion pattern of FIG. 6, which has fewer inversion pixels, is used, the contrast of the cursor portion is reduced, as shown in FIG. 8. Furthermore, the image display section may be subjected to brightness modulation so that the contrast of the cursor differs from that of other parts.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a display device in which the cursor can be clearly identified regardless of the display content on the screen.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a block diagram showing a schematic configuration, FIG. 2 is a diagram for explaining a reversal pattern, and FIGS. 3 and 4 show examples of cursor display. FIGS. 5 and 6 are diagrams for explaining reversal patterns in other embodiments, and FIGS. 7 and 8 are diagrams for explaining inversion patterns in other embodiments.
The figure is a diagram showing an example of a cursor display in another embodiment. 1...Refresh memory, 2...Vertical counter,
3... Horizontal counter, 4... Comparison circuit, 5... Matrix table, 6... Exclusive OR circuit, 7...
・Image display section, C...cursor, a...inverted pixel,
b...Non-inverted pixel. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 [71 Pages of Purity] (no change in content) Figure 5 Figure 6 6 hearts in the drawing (no change in content) 71st! F may! J Patent Office Commissioner Manabu Shiga 1, Indication of the case Japanese Patent Application No. 59-252308 2, Device for indicating the name of the invention 3, Person making the amendment Relationship with the case Patent applicant (307) Toshiba Corporation 4, Amendment to Agent Proceedings Showa Quantity 001-2゜Manabu Shiga, Director General of the Patent Office 1, Indication of Case 4IN No. 59-252308 Indication Device 3, Person making the amendment Relationship with the case Patent Applicant (307) Toshiba Corporation 4. Agent 6, Amendment pair fQ Specification 7, Statement of contents of amendment, page 9, line 13 K: ``It is structured to specify.'' The phrase ``It is structured to specify.'' ” he corrected.

Claims (2)

[Claims] (1) A refresh memory that sequentially outputs one screen's worth of image information, an address designation device that designates a read address of this refresh memory, and a comparison between the read address by this address designation device and the address value of the cursor. a comparison means for outputting a cursor display signal when the results match; a matrix table in which inverted signals and non-inverted signals are stored in a matrix format corresponding to the read address by the addressing means; and the cursor. means for outputting an inverted signal or a non-inverted signal read out from the matrix table in accordance with a read address by the addressing means at this time according to a display signal; and a signal outputted by this means and read out from the refresh memory. What is claimed is: 1. A display device comprising: exclusive OR means for calculating an exclusive OR with an image signal, and display means for displaying an output signal of the exclusive OR means. (2) The display device according to claim 1, wherein the combination of inverted signals and non-inverted signals in the matrix table is in a houndstooth pattern.