KR20000001755A - Signal process apparatus to perform progressive scan - Google Patents

Abstract

PURPOSE: A signal process apparatus to perform progressive scan is provided to improve display quality thereof. CONSTITUTION: The apparatus comprises a PC(personal computer) signal processor(210), a R(red),G(green),B(blue) driver(220) and a CRT(cathode ray tube, 230). The PC signal processor(210) converts an input PC image signal into a brightness signal(Y) and hue signals(U, V) according to a progressive scan type. The RGB driver(220) amplifies RGB signals from the output signal of the PC signal processor(210), and outputs the amplified RGB signals. The CRT(230) operates according to the output signal from the RGB driver(220).

Description

Signal processing device for implementing sequential scanning

The present invention relates to a signal processing apparatus of a projection type display unit.

More specifically, when the PC image signal is converted and processed by progressive scanning, signal processing is performed using luminance (Y) and chrominance signals (U, V) to reduce image quality deterioration and to simplify signal processing. The present invention relates to a signal processing apparatus for implementing progressive scanning in a projection type image display apparatus capable of realizing a clear image by a progressive scanning method.

Projection type image display devices, which are increasingly being used due to the fact that they can realize large screens of 30-40 inches or more, are a means for displaying color screens on a screen, such as LCD, R, G, and B. A plurality of cathode ray tubes (CRTs) projecting three pixels are used.

Among them, a projection type image display apparatus using a cathode ray tube as a display means adopts an interlaced scanning method to display an image, and uses an encoder to convert a PC image signal input from the PC as an external image signal. Can be input via the display.

1 is a schematic block diagram showing a projection type image display apparatus for displaying a PC image signal using such a conventional encoder.

As shown, a projection type image display apparatus for displaying a PC image signal using a conventional encoder may convert the input PC image signal into primary colors of red (R), green (G), and blue (B). The encoder 110 converts and outputs a luminance (Y) and chroma signal (C) or a composite video signal (CVBS: composite video burst sync), and an external video signal and encoder such as an input television (TV) and a VCR. An input signal selector 120 that selects one of the output signals of 110 and converts it to R, G, and B, and outputs an image signal output from the input signal selector 120 to R, G, and B, respectively. It consists of an RGB driver 130 for amplifying and outputting, and a CRT unit 140 having a cathode ray tube driven according to the output signal of the RGB driver 130.

The operation of the projection type image display apparatus for displaying a PC image signal using the conventional encoder configured as described above is as follows.

First, the encoder 110 is provided on the outside of the projection image display apparatus and inputs the PC image signal inputted with the primary color or luminance (Y) and chromaticity of red (R), green (G), and blue (B) in interlaced scanning. The signal C is converted into a composite video burst sync (CVBS) format and output to the input signal selector 120.

The input signal selector 120, the RGB driver 130, and the CRT unit 140 form a projection image display apparatus. First, the input signal selector 120 is input to the projection image display apparatus. And one of an external video signal such as a VCR and a video signal input from the external encoder 110, and converts it to R, G, B and outputs the converted video signal.

Here, external video signals such as TVs and VCRs are also primary colors of interlaced scanning, R, G, and B, or video signals of Y, C, or CVBS.

The output signal of the input signal selector 120 output as described above is amplified for each of R, G, and B in the RGB driver 130 and has a cathode ray tube driven in accordance with the output signal of the RGB driver 130. It is applied to the CRT unit 140 to cause the cathode ray tube to project each pixel on the screen to implement a color screen supplied from the PC as a whole.

However, since the projection type image display apparatus for displaying a PC image signal using a conventional encoder having the same configuration and operation as described above has to be equipped with an encoder, which is a separate device, it causes inconvenience in its use.

In addition, as the PC image signal is converted into R, G, B, Y, C, or CVBS format and output from the encoder, the projection image display device processes the signal as R, G, B, or the screen shake, brightness, or color. There has been a problem in that a video signal degradation phenomenon occurs.

In addition, the conventional projection type image display device displays the image signal by the interlaced scanning method, so that the roughness of the image is increased when the screen is enlarged or the viewing distance approaches, resulting in deterioration of the image quality.

Accordingly, an object of the present invention is to have a separate image signal processing circuit if the projection type image display device is to display a PC image signal, and does not require a separate external device, and after converting the PC image signal to Y, U, V, It is an object of the present invention to provide a signal processing apparatus for implementing a sequential scan that can be processed in a sequential scan method.

1 is a schematic block diagram showing a projection type image display apparatus for displaying a PC image signal using a conventional encoder;

2 is a block diagram showing a signal processing apparatus for implementing a sequential scan according to the present invention;

3 is a block diagram showing an example of a signal processing apparatus for implementing a PC video signal as sequential scanning by R, G, B, Y, C or CVBS.

* Explanation of symbols for main parts of the drawings

210: PC signal processor 220: RGB driver

230: CRT section

211: YUV conversion section 212: A / D section

213: Sequential scan processing unit 214: D / A unit

A feature of the signal processing device for implementing a sequential scan according to the present invention for achieving the above object is to use a plurality of cathode ray tubes projecting three pixels R, G, B as a means for displaying a color screen on the screen In the projection type image display apparatus, the PC signal processing unit converts the input PC image signal into YUV, and then converts the image signal output from the PC signal processing unit to R, G, and B respectively. It consists of a CRT part which has an RGB drive part to output, and a cathode ray tube respectively driven according to the output signal of an RGB drive part.

Hereinafter, a preferred embodiment of a signal processing apparatus for implementing sequential scanning according to the present invention will be described in detail with reference to FIGS. 2 and 3.

2 is a block diagram showing a signal processing apparatus for implementing a sequential scan according to the present invention.

As shown, a signal processing apparatus for implementing a sequential scan according to the present invention includes a PC signal processing unit 210 for converting an input PC image signal into Y, U, and V and then converting it to a sequential scanning method, and a PC. An RGB driver 220 for amplifying and outputting an image signal output from the signal processor 210 into R, G, and B, and three or more cathode ray tubes respectively driven according to the output signal of the RGB driver 220; It is composed of a CRT unit 230.

Here, the PC signal processing unit 210 is a component included in the projection type image display apparatus, and includes a YUV converter 211 for converting an input PC image signal into luminance Y and color difference signals U and V, and YUV. An A / D unit 212 for converting the analog output signal of the conversion unit 211 into a digital signal, and a sequential scan processing unit 213 for converting the output signal of the A / D unit 212 to match the sequential scanning method; And a D / A unit 214 for converting the digital output signal of the sequential scan processing unit 213 into an analog signal.

The operation of the signal processing device for implementing a sequential scan with these components is as follows.

When the PC image signal is input to the projection type image display apparatus, the PC signal processor 210 converts the image signal into YUV and then converts the image signal into a sequential scanning method, which is then subjected to the following process.

First, the PC video signal input by the YUV converter 211 is converted into luminance Y and color difference signals U and V, and the A / D unit 212 converts the analog output signal of the YUV converter 211. Convert to a digital signal.

As described above, the digitally converted PC video signals of Y, U, and V are converted by the sequential scanning processing unit 213 to conform to the sequential scanning method, and are converted back into analog signals by the D / A unit 214 to be converted into the PC signal processing unit 210. Is applied to the RGB driver 220 as an output signal.

The RGB driver 220 amplifies an image signal output from the D / A unit 214 of the PC signal processor 210 into R, G, and B, respectively, to output the cathode ray tube corresponding to R, G, and B. do.

The CRT unit 230 having cathode ray tubes respectively driven according to the output signal of the RGB driver 220 is driven as described above to project each pixel on the screen, and is sequentially processed by a deflection circuit of the cathode ray tube not shown. The scanning method deflects the image transmitted from the PC on the screen.

FIG. 3 is a block diagram showing an example of a signal processing apparatus for implementing a PC video signal as sequential scanning by R, G, B, Y, C, or CVBS. As shown in FIG. The case is not treated as V.

As shown in FIG. 3, a signal processing apparatus for implementing a PC video signal as a sequential scan using R, G, B, Y, C, or CVBS may include a large input PC video signal in R, G, B, Y, C, or The encoder 310 converts and outputs the CVBS, the YUV processing unit 320 that receives the output signal of the encoder 310 and converts it to Y, U, and V, and the YUV processing unit 320 receives the output signal and sequentially scans it. A sequential scan processing unit 330 for signal processing in a manner, a second D / A unit 340 for converting an output signal of the sequential scan processing unit 330 as a digital signal into an analog signal, and a second D / A unit 340 CRT unit 360 including an RGB driver 350 for amplifying and outputting an image signal outputted from R), G, and B, respectively, and three or more cathode ray tubes respectively driven according to the output signal of the RGB driver 350. It is composed of

The operation of the signal processing device for implementing the PC video signal having such components as sequential scanning by R, G, B, Y, C or CVBS is as follows.

When the PC video signal is input, the encoder 310 converts it to R, G, B, Y, C, or CVBS, and outputs it. The YUV processor 320 receives the output signal of the encoder 310 and receives Y, U, V. Convert to

The signals converted into Y, U, and V are sequentially processed by the sequential scanning processing unit 330, and are converted into analog signals by the second D / A unit 340 and applied to the RGB driver 350.

The RGB driver 350 amplifies the input image signal into R, G, and B to output the cathode ray tube corresponding to R, G, and B.

The CRT unit 360 includes three or more cathode ray tubes each driven according to the output signal of the RGB driver 350. The CRT unit 360 is driven as described above to project each pixel on the screen. By the circuit is deflected in a sequential scan method, the image transmitted from the PC is displayed on the screen.

The configuration and operation of the encoder 310 in the process of operating as described above are as follows.

First, the input PC video signal is converted into digital Y, U, V while passing through the first YUV converter 311 and the first A / D unit 312, and then the RGB converter 313 or the first YC. The converter 314 is applied.

The RGB converter 313 converts the input Y, U, and V signals into R, G, and B, and then applies them to the first D / A unit 316. The first YC converter 314 is input. The Y, U, and V signals are converted into Y and C and applied to the first D / A unit 316 or the CVBS conversion unit 315.

The CVBS converter 315 converts the Y and C signals output from the first YC converter 314 into CVBS and applies them to the first D / A unit 316.

As described above, the first D / A unit 316 converts the input R, G, B, Y, C, or CVBS signal into an analog signal and outputs the analog signal to the YUV processor 320.

As such, the configuration and operation of the YUV processing unit 320 that receives three output signals of the encoder 310 are as follows.

Among the R, G, B, Y, C, and CVBS signals output from the first D / A unit 316 of the encoder 310, the R, G, B, Y, C signals are output from the second YUV converter 321. The signal is converted into Y, U, and V again, and the CVBS signal is converted into Y and C through the second YC converter 322 and then applied to the second YUV converter 321.

In the second YUV converter 321, all input signals are converted into Y, U, and V, and the output signals are converted into digital signals by the second A / D unit 323 and then sequentially scanned. 330 is applied.

When the PC video signal is implemented as sequential scanning by R, G, B, Y, C, or CVBS using the encoder as described above in FIG. 3, the image is clearer than the interlaced scanning method, but the encoder 310 ), Y, U, V is converted to R, G, B, Y, C, or CVBS, and the YUV processing unit 320 converts Y, U, V back to Y, U, V. Will deteriorate.

As described above, according to the signal processing apparatus for implementing the sequential scanning according to the present invention, the projection type image display apparatus can easily display the PC image signal input from the outside and reduce the deterioration of image quality even without using the encoder. And it has the advantage that can implement a clear image by the sequential scanning method.

Claims (2)

In the projection type image display apparatus using a cathode ray tube for projecting three pixels R, G, B as a means for displaying a color screen on the screen, A PC signal processing unit converting the input PC image signal into luminance (Y) and chrominance signals (U, V) and then converting the PC image signal to match the progressive scanning method; An RGB driver for amplifying and outputting an image signal output from the PC signal processor into R, G, and B; And Signal processing apparatus for implementing a sequential scanning, characterized in that the CRT unit having a cathode ray tube driven in accordance with the output signal of the RGB driver. The apparatus of claim 1, wherein the PC signal processing unit; A YUV converting unit converting the input PC image signal into luminance Y and color difference signals U and V; An A / D unit converting the analog output signal of the YUV converter into a digital signal; A sequential scan processing unit converting the output signal of the A / D unit to conform to the sequential scanning method; And And a D / A unit configured to convert the digital output signal of the sequential scan processing unit into an analog signal.