KR960039844A - Synchronous signal transmission control device of image display device - Google Patents

Abstract

The present invention provides a multiplexer between the synchronizing signal separating means and the pseudo synchronizing signal generating means and synchronizes from the synchronizing signal separating means or the pseudo synchronizing signal generating means through the multiplexer when the power is turned on regardless of whether the image signal is input. SUMMARY OF THE INVENTION An object of the present invention is to provide a synchronization signal transmission control apparatus of an image display device in which a signal / pseudosynchronous signal is always transmitted to a signal processing stage at a later stage.

To this end, the present invention, the synchronization signal separation unit 10 for separating the synchronization signal from the input image signal, pseudo-synchronization signal generation means 15 for generating a predetermined pseudo synchronization signal, the synchronization signal separation unit 10 A horizontal synchronous signal from the phase synchronous loop unit 20, the synchronous signal separation unit 10, or the pseudo synchronous signal generating means 15 which receives the horizontal synchronous signal from the phase lock and phase locks the internal reference clock. The sync signal separating unit 10 or the system clock signal from the field discriminating unit 25 and the control unit 45 for discriminating the odd field and the even field for driving the pixel driver by dividing the vertical sync signal. In the image display apparatus having the delay means 30 for delaying the composite synchronous signal from the pseudo synchronous signal generation means 15, it is provided between the synchronous signal separation section 10 and the pseudo synchronous signal generation means 15. The control Under the control of 45, the phase synchronizing loop unit 20, the field discriminating unit 25, and the synchronizing signal from the synchronizing signal separating unit 10 or the pseudo synchronizing signal generating unit 15 respectively correspond. A multiplexer 50 is further provided for transmitting to the delay means 30, and the control unit 45 separates from the sync signal separator 10 when an image signal is input to the sync signal separator 10. FIG. The multiplexer 50 is controlled so that the synchronized signal is transmitted to the phase synchronization loop unit 20, the field discrimination unit 25, and the delay means 30, while the image is transmitted to the synchronization signal separator 10. When no signal is input, the multiplexer is configured to transmit the pseudo-synchronous signal from the pseudo-synchronous signal generating means 15 to the phase-locked loop part 20, the field discriminating part 25, and the delay means 30. 50 is to control.

Description

Synchronous signal transmission control device of image display device

As this is a public information case, the full text was not included.

1 is a block diagram illustrating a synchronization signal transmission control apparatus of an image display apparatus according to an embodiment of the present invention.

Claims (1)

A sync signal separator 10 for separating the sync signal from the input image signal, a pseudo sync signal generation means 15 for generating a predetermined pseudo sync signal, and a horizontal sync signal from the sync signal separator 10 A vertical synchronization signal is divided on the basis of the horizontal synchronization signal from the phase synchronization loop unit 20, the synchronization signal separation unit 10, or the pseudo synchronization signal generation means 15 which receive and phase lock the internal reference clock. The field discrimination unit 25 for discriminating the odd field and the even field for driving the pixel driver, and the synchronizing signal separation unit 10 or the pseudo synchronizing signal generating means based on the system clock signal from the control unit 45; An image display apparatus having a delay means (30) for delaying a composite synchronization signal from (15), wherein the control unit (45) is provided between the synchronization signal separation unit (10) and the pseudo synchronization signal generation unit (15). Under the control of) The synchronous signal from the synchronous signal separation section 10 or the pseudo synchronous signal generation means 15 is respectively supplied to the phase synchronous loop section 20, the field discrimination section 25, and the delay means 30, respectively. The apparatus 45 further includes a multiplexer 50 that transmits the signal, and when the image signal is input to the sync signal separator 10, the sync signal separated by the sync signal separator 10 is in phase. While controlling the multiplexer 50 to be transmitted to the synchronous loop unit 20, the field discrimination unit 25, and the delay means 30, the image signal is not input to the synchronous signal separation unit 10. If not, the multiplexer 50 is transmitted such that the pseudo-synchronous signal from the pseudo-synchronous signal generating means 15 is transmitted to the phase-locked loop part 20, the field discriminating part 25, and the delay means 30. Synchronization of the image display apparatus characterized by controlling Call transfer control device. ※ Note: The disclosure is based on the initial application.