KR950002663B1 - Screen vertical movement apparatus and control method of hdtv - Google Patents

Abstract

The vertical movement unit and control method controls vertical movement by setting up/down movement value of display and provides the good screen quality by removing the noise by synchronous conversion. The vertical scroll unit of display comprises a key unit; a microcomputer outputting movement information accorinding to key inputs; a data output unit storing the output of microcomputer in parallel; a counter outputting delayed signal of vertical synchronous signal by counting using horizontal synchronous signal as clock.

Description

How to control screen vertical movement and vertical movement of HDTV receiver

(A) and (b) of FIG. 1 show a vertical movement state of the screen depending on whether the synchronization signal is delayed.

2 is a block diagram of a vertical screen moving device of the present invention.

3 is a flow chart of the screen vertical movement control method of the present invention.

4A and 4B are vertical synchronization signal timing diagrams according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Key control unit 2: Microcomputer

3: data output section 4: counter

5: deflection portion 6: CPT

In the present invention, a user performs a zoom (Z00M) mode operation in which an HDTV (high definition TV) receiver displays an image signal having an aspect ratio of 3: 4 on a screen having an aspect ratio of 9: 16. The present invention relates to a screen vertical moving device and a control method thereof for viewing by shifting the position vertically.

Conventionally, when performing a zoom mode process in which a 3: 4 screen is enlarged based on a horizontal length and displayed on a 9: 16 screen, as shown in (a) of FIG. 1, it is perpendicular to a 9: 16 screen (solid line). Since the up / down of the 3: 4 screen (dotted line) increased in the direction becomes impossible to display, it is reproduced by vertically moving the screen as shown in (b) of FIG. 1 with respect to the top or bottom of the screen. It is implemented by delaying the signal (V.sync) for a certain time.

That is, in the related art, the vertical synchronous signal is delayed for a predetermined time through the multi-vibrator of several stages, and the delayed vertical synchronous signal is applied to the deflection circuit so as to be based on the top or bottom of the screen (in case of b) of FIG. 3). By shifting the four screens, the viewing of some areas of the entire image is secured.

However, according to the conventional screen vertical shifting device, since the vertical synchronization delay is performed by the multivibrator, the delay step and the time cannot be fixedly variable, and the limitation that the viewer cannot select the desired viewable area among the 3: 4 screens, There is a problem in that noise is generated due to the synchronization conversion and image quality is deteriorated.

The present invention enables accurate control of the screen vertical movement amount by setting the up / down movement amount of the screen in response to the user's key operation and counting the set movement amount by the clock to delay the vertical synchronization signal by the count value. This arbitrary composition is easy, and aims at the screen vertical moving device and the vertical moving control method of the HDTV receiver, which can prevent the degradation of the image quality by excluding the noise accompanying the synchronous conversion, and with reference to the accompanying drawings. The configuration and the screen movement control operation according to the configuration are as follows.

First, referring to FIG. 2, the circuit configuration of the apparatus of the present invention will be described. The key operation unit 1 including the screen vertical shift key and the screen position shift amount are increased / decreased / decreased in response to the key operation signal. A microcomputer 20 for outputting the information as the movement amount setting information, a data output unit 3 for temporarily converting the output data of the microcomputer 2 into parallel data, and temporarily storing the output data; ) Is counted as a clock to delay the vertical synchronization signal (V.sync) by the set amount of movement data, and is output to the deflection unit 5, and the screen display position is moved up / down by the counter output vertical synchronization signal. A deflection section 5 for moving display and a CPT 6 for displaying image data by the deflection section 5 are provided.

On the other hand, the data output section 6 is composed of a shift register 3A for converting the output data of the microcomputer 2 into parallel data, and a buffer 3B for temporarily storing the parallel data and supplying it to the counter 4; Thus, the screen display position movement control operation is as follows.

That is, referring to FIG. 2 and FIG. 3, when the user operates the screen position up / down movement key previously contracted on the key operation unit 1, the microcomputer 2 decrypts the current 3: 4 screen. Whether or not the zoom mode is displayed in a 9:16 screen.

As a result of the determination, in the zoom mode, the synchronous delay data for the vertical position movement, that is, the position movement amount data, is increased or decreased within the upper and lower limit values corresponding to the key operation. When the key operation is completed and the vertical position movement amount is determined, the increased / decreased data is supplied as serial data to the data output unit 3 as the movement amount setting information.

This data is input to the shift register 3A, shifted, stored in the buffer 3B as n-bit parallel data, and then downloaded to the input terminals Do to Dn of the counter 4.

The counter 4 counts down the horizontal synchronous signal from the input data when the vertical synchronous signal V.sync is applied to the load control stage, and carries it at the carry output stage C when the count ends (output = 0). The signal is output.

Therefore, this carry signal becomes a vertical synchronous signal in which the vertical synchronous signal V.sync is delayed by a count value, becomes a delayed vertical synchronous signal, and this delayed vertical synchronous signal is supplied to the deflection unit 5, thereby providing a CPT (6). 3: 4 screen displayed in) is displayed by moving up / down.

FIG. 4 (a) shows the signal timing when the vertical synchronization signal (V.sync) frequency is 60 Hz, which shows that this signal is delayed by a predetermined time Td as shown in FIG. Where Tc represents the down count time.

This delay time Td is related to the relationship of Td = 2 ⁿ -DATA} × fh when data DATA loaded from the microcomputer 2 to the counter, the horizontal synchronization signal frequency fh, and n bits of data are loaded. Is made of. Therefore, in the embodiment using n = 12 bits, 60 Hz load signal, and 15.75 KHz clock, the delay time due to the data "1" bit value applied to the counter 4 is approximately 63.6 µsec (Td = 16.7 msec / 262.5 ( 1-Feed Injector) 63.6 µsec.

Therefore, according to the increase / decrease of the count value, it is possible to perform delay control of the vertical synchronization signal by 63.6 μsec.

As described above, according to the present invention, by applying a vertical synchronization signal as a counter load signal, a synchronization signal delayed in the retrace period is input or started, thereby eliminating noise due to synchronization conversion, thereby preventing image degradation. Through the simple key operation, the vertical display position of the screen can be continuously changed, and thus the convenience of watching TV can be achieved.

Claims (4)

A key operation unit 1 including a screen vertical movement key, a microcomputer 2 for increasing / decreasing the screen position movement amount in response to the key operation signal, and outputting the increased / decreased data as the movement amount setting information; The data output unit 3 converts the output data into parallel data and temporarily stores the output data, and downloads the output data and counts the horizontal sync signal H.sync as a clock to set the vertical sync signal V. sync. An apparatus for vertically moving a screen of an HDTV receiver, comprising a counter (4) for delaying data and outputting it to the CPT deflection unit (5). The data output section (3) according to claim 1, wherein the data output section (3) includes a shift register (3A) for converting the output data of the microcomputer (2) into parallel data, and a buffer (3B) for temporarily storing the parallel data and supplying it to the counter (4). Screen vertical movement device composed of HDTV receiver. When the screen position vertical movement key of the key operation unit 1 is operated, the process of increasing / decreasing the screen position movement amount corresponding to the operated key when the current screen display is the zoom mode, and the increase / decrease of the movement amount of the screen position ends. And outputting the increased / decreased data as moving amount setting information and downloading it to the counter (4). The method of claim 3, further comprising increasing and decreasing the screen position movement amount within a range within an upper / lower limit by setting an upper limit and a lower limit value of the screen position movement amount.