Converter and method with hybrid RGB chart and YUV video signal

FIELD OF THE INVENTION The present invention relates to a switching device and related methods, and more particularly to a switching device capable of mixing RGB graphics signals and YUV image signals, and related methods. method.

2. Description of the Related Art In a computer system, the input format of an image signal and a graphic signal are different. The input format of the image signal can be YUV (or YCbCr) or RGB, and the input format of the graphic signal is RGB. If the output display is a computer For compatible LCD, CRT or PDP monitors, the output format of the image signal and graphic signal are both RGB; if the output monitor is a TV, the output format of the image signal and graphic signal must be YUV (or YCbCr) to comply with The format of the TV signal. Therefore, if the input format of the image signal is YUV (or YCbCr) and the output display is a TV, the YUV image signal must be converted into an RGB image signal, and then the RGB image signal and the RGB graphic signal must be mixed and converted into The YUV signal is then output to the TV. During this conversion process, the image signal will be slightly distorted, such as color distortion.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of a conventional image switching device 100. The image switching device 100 includes a first image conversion module 120, a second image conversion module 140, a mixing module 130, a TV output interface 110, a liquid crystal display (LCD) output interface 112, and a CRT display output interface 114 And a PDP display output interface 116. The first image conversion module 120 is used to convert the YUV image signal into an RGB color image signal, and the second image conversion module 140 is used to convert the RGB signal generated after the RGB image signal and the RGB graphic signal are mixed into a YUV signal. The mixing module 130 uses To mix RGB image signals and RGB graphics signals to generate RGB signals.

When the first image conversion module 120 receives the YUV image signal, the first image conversion module 120 converts the YUV image signal into an RGB image signal, and then outputs the RGB image signal to the mixing module 130, and the mixing module 130 is used for The RGB image signal and the RGB graphic signal are received, and the two signals are mixed and output to the output interface together, so that the image and the graphic are simultaneously displayed on a display screen. If the display is a computer compatible LCD, CRT or PDP display, the hybrid module 130

200410082542.4 Directly output the mixed RGB signal to the LCD output interface 112, CRT display output interface 114 or PDP display output interface 116; if the display is a TV, the mixing module 130 first outputs the mixed RGB signal to the second The image conversion module 140 converts the RGB signal into a YUV signal by the second image conversion module 140, and then outputs it to the TV output interface 110.

As mentioned above, in the known image switching device 100, the YUV image signal must be converted into RGB image signal by the first image conversion module 120. If the output display is a TV, the second image must be used. The conversion module 140 then converts the RGB image signal back to the YUV image signal and then outputs it to the TV. Because the original received image signal undergoes two format conversions, the image signal is output to the TV with image distortion, such as color distortion, etc. Wait.

SUMMARY OF THE INVENTION Therefore, the main purpose of the present invention is to provide a switching device that can mix RGB graphics signals and YUV image signals and related methods to solve the above-mentioned known problems.

The present invention discloses a switching device capable of mixing RGB graphic signals and YUV binary image signals and related methods, which include a graphic conversion module for converting RGB graphic signals into YUV graphic signals, and a mixing module. The mixing module is connected to the graphics conversion module, and is used to receive the YUV image signal and the YUV graphics signal output by the graphics conversion module, and after performing a mixing action, output the YUV signal.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a known image switching device.

FIG. 2 is a schematic diagram of the image switching device of the present invention.

Description of reference symbols

110 TV output interface

114 CRT display output interface

120 first image switching module

210 second switching module

230 image conversion module

255 mixing unit

100, 200 shirt image adapter

112 LCD display 7F output interface

116 PDP display output interface

140 second image switching module

220 first switching module

240 graphics conversion module

260 basic I/O system

130, 250 hybrid module

200410082542.4 No.

212, 222, 232, 242, 252, 254, 256, 258 input ports

214, 216, 224, 226, 234, 244, 251, 253 output port specific implementation, please refer to FIG. 2, FIG. 2 is a schematic diagram of the image switching device 200 of the present invention, the image switching device 200 includes an image conversion module 230, A graphics conversion module 240, a hybrid module 250, a TV output interface 110, a liquid crystal display (LCD) output interface 112, a CRT display output interface 114, a PDP display output interface 116, a first switching module 220, A second switching module 210 and a basic output/input system (BIOS) 260. The basic input output system 260 is connected to the control terminal 228 of the first switching module 220 and the control terminal 218 of the second switching module 210, and is used to switch the first switching module 220 so that the second output ports 224, 226 of the first switching module 220 are An output port of the first switching module 220 outputs the RGB graphics signal received by the input port 222, and the second switching module 210 is switched so that one of the two output ports 214, 216 of the second switching module 210 outputs the second switching The YUV image signal received by the input port 212 of the module 210.

For example, when the output display detected by the basic I/O system 26Q is a TV, the basic I/O system 260 outputs a control signal to the control terminal 228 of the first switching module 220 and the control terminal 218 of the second switching module 210 At this time, the RGB graphics signal received by the first switching module 220 is input to the input port 242 of the graphics conversion module 240 through the first output port 224 of the first switching module 220, and the second switching module 210 borrows the YUV image signal The second output port 216 of the second conversion module 210 is input to the second input port 254 of the mixing module 250, and the RGB graphic signal is converted into a YUV graphic signal by the graphic conversion module 240 and then input to the first input port of the mixing module 250 252. The mixing unit 255 of the mixing module 250 mixes the YUV graphic signal received by the first input port 252 and the YUV image signal received by the second input port 254, and finally the first output port 251 of the mixing module 250 mixes the The generated YUV signal is output to the TV output interface 110. When the output display detected by the basic I/O system 260 is a computer-compatible LCD, CRT or PDP display, the basic I/O system 260 outputs a control signal to the control terminal 228 of the first switching module 220 and the second switching module 210's control end 218, at this time The YUV image signal received by the second switching module 210 is input to the input port 232 of the image conversion module 230 through the first output port 214 of the second switching module 210, and the first switching module 220 transfers the RGB graphic signal through the first switching The second output port 226 of the module 220 is input to the third input port 256 of the mixing module 250, and the YUV image signal is converted into RGB image by the color image conversion module 230.

200410082542.4 After the first image signal is input to the fourth input port 258 of the mixing module 250, the mixing unit 255 of the mixing module 250 mixes the RGB graphic signal received by the third input port 256 and the RGB image signal received by the fourth input port 258, Finally, the second output port 253 of the mixing module 250 outputs the mixed RGB signal to the liquid crystal display output interface 112, the CRT display output interface 114, or the PDP display output interface 116.

In the present invention, when the output display is a TV, the YUV image signal does not need to be converted into RGB and then converted back to YUV, which means that it does not need to undergo two format conversions, but directly input the YUV image signal to The mixing unit 255 of the mixing module 250 mixes with the converted YUV graphic signal and then outputs the YUV signal to the TV. Therefore, the image distortion will be minimized when the image signal is output to the TV. In addition, the basic I/O system 260 can output control signals to switch the output ports of the first and second switching modules 220 and 210 according to the type of output display. Therefore, the image conversion device 200 can control the image while maintaining the lowest distortion. The signal and graphic signal are mixed and output.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention shall fall within the scope of the patent of the present invention.

200410082542.4