JPS61160797A - Video signal processor - 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 the Invention The present invention relates to a video signal processing device for displaying a 21-value color video signal on a binary seven-frame display device such as a liquid crystal display device.

2. Description of the Related Art In recent years, video signal processing devices have been viewed as advanced due to the appearance of various display devices. Among these, video signal processing devices for liquid crystal display devices play an important role in industries pursuing compactness.

An example of the above-mentioned conventional video signal processing device will be described below with reference to the drawings.

FIG. 2 shows a block diagram of a conventional video signal processing device.

11 is a color video signal generating device such as a personal computer, and IA, IB, and IC are binary color video signals of red, green, and blue outputted from this color video signal generating device 11, and are used to determine the background color period and character color. There is a period. Reference numeral 12 denotes an OR unit which ORs the color video signals of 211 color video signals @IA, IB, and IC and outputs a binary monochrome video signal @1D of logic "0'' or logic "1''.

The operation of the video signal processing device configured as described above will be described below.

FIG. 3 shows the relationship between color video signals and monochrome video signals. In FIG. 3, numeral 31 indicates a combination of binary color video signals (red, green, stomach) output from the color video signal generator 11 of FIG. 32 indicates the color corresponding to each combination. 33 is a brightness signal indicating the brightness corresponding to each combination of 31,
34 indicates its brightness. 33 and 34 show how things change in an analog manner. 35 indicates a binary monochrome video signal corresponding to each combination of 31. The binary red, green, and stomach color video signals 1A, 1B, and IC output from the color video signal generator 11 in FIG.
2, the logical sum is taken. That is, as shown in FIG. 3, if the logic of any one of the red, green, and blue color signals (binary) is 1, the monochrome video signal becomes logic "1".

Problems to be Solved by the Invention With such a conventional configuration, as shown in FIG. 3, signals other than black cannot be distinguished. In the case of analog monochrome video signals, 33.
However, in the case of a binary monochrome video signal, for example, it is possible to distinguish between red and black, but it is not possible to distinguish between red and blue. A binary color video signal consists of a background color and a text color, but depending on the combination of these two colors, it is possible to distinguish between them in color, but it is difficult to distinguish between them in monochrome, which is a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a video signal processing device that can create a binary monochrome video signal that distinguishes different background colors and text colors in all color combinations from a binary color video signal. .

Means for Solving the Problems The video signal processing device of the present invention includes an OR unit that inputs binary color projection signals of a plurality of colors to generate a binary monochrome video signal, and a logical sum unit that is included in the color video signal. a color setting switch section that sets the background color or text color with a switch and outputs a color designation signal; a comparison section that compares the color video signal and the color designation signal; and a binary output from the logical sum section. The monochrome video signal is ANDed with the output of the comparison section, and when the color video signal and the color designation signal do not match, the monochrome video signal is output, and when the two match, the monochrome video signal is forcibly output. The present invention is characterized in that it is provided with a logical product section that is not output.

Effect With this configuration, for example, when the background color set by the color setting switch section and the background color output from the color video signal generation section match, the output of the 21[7-chrome video signal of the background color is stopped, thereby generating characters. By setting the color to a strong logic different from that of a binary monochrome video signal, the background color and text color can be completely distinguished.

Example An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows a block diagram of a video signal processing device of the present invention. In FIG. 1, 11 is a color video signal generator;
2 is a logical sum unit, IA, 1B, and IC are binary color signals of multiple colors (red, green, and blue signals in order) output from the color video signal generator 11, and 1D is output from the logical sum unit 12. The above is a conventional binary monochrome video signal.
The configuration is the same as the one shown in the figure. Reference numeral 13 denotes a background color setting switch section, which sets the background color included in the color video signal by turning the switch on or off, and outputs red IE, green IF, and blue 1G color signals, which are binary background color designation color signals. do.

Reference numeral 14 denotes a comparison section that compares color video signals 1A, IB, and IC, which are the outputs of the color video signal generator values, and background color designation color signals 1E, IF, which are the outputs of the background color setting switch section 13.
, 1G and outputs the result as a comparison signal 1H. Reference numeral 15 denotes a logical product section, which performs a logical product of the monochrome video signal 1D and the comparison signal 1 day, and outputs a binary monochrome video signal 1J in this embodiment.

The operation of the video signal processing device configured as above will be described below.

In FIG. 1, the color video signals of IA, 1B, and IC output from the color video signal generator 11 include a background color and a character color. If a binary monochrome video signal was created by simply ORing color video signals using the conventional method, it would not be possible to distinguish between the two depending on the combination of the background color and text color (conventionally, (see example).

Therefore, in this example, the background color is set by a switch,
Set background color specification color signal IE.

IF, 1G and color video signals @IA, IB, 1C are compared by the comparison unit 14, and when the rain sound matches, that is, when the color video signal generator 111 is outputting the background color, the comparison signal 1H is generated. The logical product unit 15 logically ANDs the conventional binary monochrome video signal 1D output from the logical sum unit 12 and the comparison signal 1st, and the comparison signal 1day becomes low. '' level, the conventional monochrome video signal @ID is passed through as is, and this is used as the monochrome video signal @1J in this embodiment. When the comparison signal 1H is at a high level, this comparison signal inhibits the output of the conventional monochrome video signal 1D and forcibly fixes it to the opposite logic to the binary monochrome video signal 1D representing the character color. In other words, the color video signal IA, 18. IC
When outputting a font color, or when the background color and font color are a combination that can be distinguished by the conventional method, the comparison signal 1st is set to the "0-" level and a binary value is output using the conventional method. A monochrome video signal is created, and the background color when there is a combination that cannot be identified using conventional methods (for example, the text color is red and the background color is blue) is converted to color video signals IA and 1B.
, when the IC is outputting, it creates a binary monochrome video signal forcibly fixed to the opposite logic to the monochrome video signal (binary) of the character color.

As described above, according to this embodiment, the background color setting switch section 13, the comparison section 14, and the logical product section 15 are provided, and the background color set by the background color setting switch section 13 and the color video signal generation section 11 are By strongly fixing the binary monochrome video signal of the background color to a different logic from the monochrome video signal of the text color when the output background color matches, the background color and text color can be completely differentiated. can be distinguished.

In addition, in the above embodiment, the background color setting switch section 13
In this example, we set the background color, but you can also set the font color.

Effects of the Invention As described above, in the video signal processing device of the present invention, when a background color is set in the color setting switch section, for example, the comparison section detects that the background color outputted from the color video signal generation section matches. Since the output of the binary monochrome video signal of the background color is stopped through detection and logical product, it is possible to completely distinguish between the background color and the character color.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the video signal processing device of the present invention, FIG. 2 is a block diagram of a conventional video signal processing device,
FIG. 3 is a diagram showing the relationship between a color video signal and a monochrome video signal. DESCRIPTION OF SYMBOLS 11... Color video signal generation device, 12... OR section, 13... Background color setting switch section, 14... Comparison section, 15... AND section, 1A... Color video signal Red signal output from the generator, 1B... Green signal output from the color video signal generator, 1C... Blue signal output from the color video signal generator, 1D...
・Conventional monochrome video signal, 1E...Red designation signal output from the background setting switch section, 1F...Green designation signal output from the back discoloration setting switch section, 1G.
...Blue designation signal output from the background color setting switch section, 1 day...Comparison signal, 1J...Monochrome video signal after correction

Claims (1)

[Claims] 1. An OR unit that inputs binary color video signals of multiple colors and creates a binary monochrome video signal, and sets the background color or text color included in the color video signal with a switch and outputs a color designation signal. a color setting switch section, a comparison section that compares the color video signal and the color designation signal, and a logical product of the binary monochrome video signal output from the OR section and the output of the comparison section; The video signal processing device is provided with an AND unit that outputs the monochrome video signal when the color video signal and the color designation signal do not match, and forcibly does not output the monochrome video signal when the two match.