KR19990028804U - Color conversion circuit for on-screen display characters - Google Patents

Abstract

A color conversion circuit for on-screen display characters is disclosed in a video signal processor. The color conversion circuit of the on-screen display character generates R, G, and B image signals for the OSD characters from the OSD data based on the horizontal and vertical synchronization signals for the OSD, and sets the color of the OSD characters set by the user. According to the control signal output from the microcomputer, to adjust the voltage level of the R, G, B video signal for the OSD character to generate the color of the OSD character set by the user. And a video signal processor for mixing the R, G, and B video signals of the OSD characters whose voltage levels are adjusted in the voltage controller and the video signals for the main screen and outputting them to the CRT. Therefore, even if the brightness change of the main screen is severe, there is an advantage that can distinguish the OSD characters clearly from the main screen.

Description

Circuit for changing color in OSD character

The present invention relates to an image signal processor that displays a mixture of characters on a screen of an image device, and more particularly, a circuit for converting a color of an On Screen Display (hereinafter referred to as OSD) character into a color designated by a user. It is about.

In general, the OSD function in television is a function that displays characters or figures such as time and channel number on the screen during the screen processing of TV and video tape recorder (VTR). The corresponding character is displayed on the screen to indicate the status of the current key operation. For example, if the screen adjustment key is pressed while watching a broadcast, the text indicating the screen adjustment menu such as "CONTRAST", "BRIGHT", "COLOR", "TINT", etc. as well as the main screen being broadcasted will be changed to BAR. , The user can press the up or down key to adjust the picture quality.

In order to implement the OSD function, the microcomputer in the TV decodes the input key signal and executes a predetermined program, and outputs control signals such as data and clock for OSD character generation to the OSD processor, and the OSD processor is output from the microcomputer. Control signals such as data and clock generate "RGB" signals and blanking signals for character display. The OSD processing unit has a different configuration depending on its function, but basically, it consists of text generation ROM, video RAM, column counter, row counter, output control unit, etc. Save it to display the character you want.

When the user wants to display the desired information as OSD characters on the main screen, as shown in FIG. 1, the OSD characters displayed on the CRT 17 through the microcomputer 11 and the image signal processor 13 are displayed as the OSD characters. In accordance with the resistance values of the resistors R11, R12, and R13 of the resistor terminals 15 connected to the R, G, and B video signals, the black and white signals or the constant color signals are displayed on the main screen.

When the OSD characters displayed as a constant color signal or a black and white signal are mixed where the brightness of the screen changes each time an object is taken, such as a camcorder, the following problems occur.

In other words, when the OSD characters formed only by the monochrome signal are mixed with the video signals of the main screen and displayed on the monitor, the OSD characters are distinguished from the main screen when the video signal of the main screen is very bright or similar to the brightness of the OSD text signal. This becomes difficult. For example, when the signal level of the OSD text is 100 IRE, when a bright signal (100 IRE) is captured as the main screen, the two signals, that is, the brightness of the main screen and the OSD text are similar, it is difficult to distinguish them from each other.

In addition, when the OSD text having a certain color signal level is mixed with the video signal of the main screen and displayed on the monitor, it is difficult to distinguish the OSD text from the main screen similarly even if it matches or is similar to the color signal level of the main screen. This follows.

Therefore, an object of the present invention is to solve the above problems, the color of the on-screen display characters in the image signal processor to distinguish the OSD characters from the main screen by always different colors of the main screen and the color of the OSD characters. To provide a conversion circuit.

In order to achieve the above object, the on-screen display character conversion circuit of the present invention

MICOM which generates R, G, B video signal for OSD text from OSD data based on horizontal sync signal and vertical sync signal for OSD, and generates predetermined control signal according to color of OSD text set by user. ;

A voltage adjusting unit for adjusting voltage levels of R, G, and B image signals for the OSD characters according to a control signal output from the microcomputer 21 to generate a color of an OSD character set by a user; And

And a video signal processor for mixing the R, G, and B video signals for the OSD character whose voltage level is adjusted with the video signal for the main screen, and outputting them to the CRT.

In addition, the color conversion circuit of the on-screen display character according to the present invention is characterized in that it further comprises a key input unit consisting of a plurality of keys that the user can specify the color of the OSD character.

1 is a schematic diagram showing a color conversion circuit of the OSD character according to the prior art, and

2 is a schematic diagram showing a color conversion circuit of the OSD character in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

21 ... micom 23 ... video signal processor

25 ... Voltage regulator 27 ... CRT

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

Figure 2 is a schematic diagram showing a color conversion circuit of the OSD character according to the present invention, the microcomputer 21, the OSD character to input the horizontal synchronization signal (H-SYNC), vertical synchronization signal (V-SYNC) and the user command signal The image signal processing unit 23 for processing the R, G, B image signals for the main screen and the image signals for the main screen and displaying them on the CRT 27, and displays the voltage levels of the R, G, B image signals for the OSD characters. It consists of a voltage adjusting unit 25 to adjust. The apparatus may further include a key input unit (not shown) including a plurality of keys for allowing a user to designate a color of an OSD character.

Referring to FIG. 2, first, a horizontal synchronous signal H-SYNC and a vertical synchronous signal V-SYNC separated from an image signal displayed on a main screen are input to the microcomputer 21. In addition, the OSD data is input to the microcomputer 21 from the OSD data input unit (not shown). The microcomputer 21 generates OSD characters from the OSD data on the basis of the horizontal synchronization signal H-SYNC and the vertical synchronization signal V-SYNC, and supplies them to the image signal processor 23 as R, G, and B image signals. do.

The image signal processor 23 mixes the image signal displayed on the main screen with the R, G, and B image signals corresponding to the OSD characters and displays the same on the CRT 27.

In the voltage controller 25, when a user command for a color of an OSD character is input to the microcomputer 21 through a key input unit (not shown), the microcomputer 21 displays the corresponding color under the control of the microcomputer 21. The voltage levels of the R, G, and B video signals for the displayed OSD characters are changed in a pull-down manner. That is, the color of the OSD text can be selected by the user according to the video signal currently displayed on the main screen.

On the other hand, the above detailed description is intended to describe the specific embodiments presented herein and is not intended to limit the present invention. Those skilled in the art may make various changes and modifications within the technical idea of the present invention with reference to the above detailed description and drawings.

As described above, according to the color conversion circuit of the on-screen display character according to the present invention, even if the OSD character is mixed on the main screen where the brightness of the screen changes frequently every time the object is taken, such as a camcorder, the color of the main screen, that is, Since the color of the OSD characters can be arbitrarily changed by the user according to the brightness, there is an advantage that the OSD characters can be clearly distinguished from the main screen.

Claims (2)

MICOM which generates R, G, B video signal for OSD text from OSD data based on horizontal sync signal and vertical sync signal for OSD, and generates predetermined control signal according to color of OSD text set by user. (21); In order to generate the color of the OSD character set by the user, the voltage adjusting unit 25 for adjusting the voltage level of the R, G, B image signal for the OSD character according to the control signal output from the microcomputer 21 ; And And a video signal processor 23 for mixing the R, G, and B video signals for the OSD character whose voltage level is adjusted in the voltage controller with the video signal for the main screen, and outputting them to the CRT 27. Color conversion circuit for on-screen display characters. The color converting circuit of claim 1, wherein the circuit further comprises a key input unit including a plurality of keys for allowing a user to designate a color of an OSD character.