KR20040020674A - Screen display time shortening method for television - Google Patents

Abstract

PURPOSE: A method for reducing screen display time of a television is provided to improve a blooming phenomenon and reduce mute time. CONSTITUTION: When a reset signal becomes a high level, a standby time period after a degauss is turned on is reduced to 0, and a standby time period before initialization of a video processor is decreased to 0.2 seconds. A color output and defection output processor, an automatic fine controller, and a PIP processor are initialized(S61), mute is on(S62), and a standard RGB output size is set to 0 to output standard RGB(S64,S65). Then, a CUT_DIS register is set to 1 to reduce a speed of a control loop(S66). The procedure waits for three seconds while heating a color picture tube, and then a blue back is on(S67,S68). The procedure waits for approximately 0.6 seconds and processes a window opening operation at the slowest speed(S69,S70). The standard RGB output size is replaced by data of a service mode function(S71), the standard RGB and white RGB are recorded(S72), and mute is cancelled(S73).

Description

How to shorten screen display time of TV {SCREEN DISPLAY TIME SHORTENING METHOD FOR TELEVISION}

The present invention relates to a method for shortening the screen display time of a television, and more particularly, to a method for shortening the screen display time of a television which makes it possible to improve the problem that the screen is turned on late when the television is powered on.

In general, as shown in FIG. 1, a sense feedback circuit uses a sense signal fed back to prevent a deterioration of image quality due to deterioration of characteristics of a color picture tube (CPT) and to always provide a constant luminance. The internal processor of the color output and deflection output processor 10 controls the standard R / G / B and the white R / G / B continuously to be set values.

The sense signal is measured and output from the color output and deflection output processor 10 according to the measurement timing diagram, and the color output and deflection output processor 10 can determine its sense output level and output line, and internal analog / digital output. Output the digitized value by the converter.

FIG. 2 is a circuit diagram illustrating a configuration of a sense input terminal of the color output and deflection output processor of FIG. 1. In the measurement timing diagram, measurement of each section is determined by internal transistor switching of the color output and deflection output processor.

Hereinafter, referring to the measurement timing diagram of the color output and the deflection output processor, as shown in FIG. 3, the combination of R1, R2, and R3 is changed over time, and the measurement section is sensed input to the sense input terminal. Section 12, which defines the reference level for analog / digital conversion of the signal, Cut Off section 14, which measures the feedback value of the current across the R1 resistor, and across the R1 // R3 resistor. White Drive measurement section 15 for measuring the current fed back value, and Beam Current Limit measurement section for measuring the feedback value of current across the R1 // R2 // R3 resistors. (16) is explained.

TML (I ² C-Bus) is a section that transmits the information that determines the sense signal line for measurement to the color output and deflection output processor. This signal must exist within the Vertical Blanking section. Measurement pulses are displayed and no measurement is made.

Looking at the input and output waveforms of the sense input stage and the output stage of the video output amplifier according to the measurement timing diagram, as shown in FIG. The voltage at the output of is converted to analog / digital, resulting in a cutoff value on the control program. This value ranges from 0 to 256, so make sure the maximum level does not exceed 1.6V. For example, when the reference value is 0.7V, the cutoff value is about 128.

FIG. 5 is a flowchart illustrating a method of initially operating a television when the power is turned on. As shown in FIG. 5, when the reset is high, the degauss is turned on and the video processor, the I ² C bus, the color output and the deflection output processor, and the automatic fine regulator And outputting standard R / G / B by initializing the PIP processor, turning on the mute, checking the power supply short circuit, and setting the standard R / G / B output size to 0 (S1 to S25); Setting the CUT_DIS register to 1 to decrease the speed of the control loop and determine whether a value fed back from the red cathode output reaches 65% of the reference value (S26 to S29); Substituting the data of the service mode function to the standard R / G / B output size, recording the standard R / G / B and white R / G / B, and unmuting (S30 ~ S32).

It takes about 7 to 8 seconds to determine whether a value fed back to the red cathode output reaches 65% of the reference value from the time taken to turn on the television and display the screen. The step is to open the cut-off loop with the standard R / G / B output size zero to improve the blooming at power-on, determine the level output to the cathode only by the standard R / G / B control values, and then Set the G / B output size to 1 to slow the control loop very slowly. When the sense pulse input to the sense input reaches 65% of the reference value, replace the standard R / G / B output size with data in service mode. Record the standard R / G / B and white R / G / B and unmute them.

6 is a diagram illustrating input and output waveforms of the sense input terminal and the output terminal of the video output amplifier according to FIG. It takes about 4.56 seconds for the blueback section to process the screen blue until it occupies and outputs the image data, so the total mute time is 10.76 seconds.

However, in the prior art as described above, due to the characteristics of the color output and the deflection output processor and the color output stage, the routine for releasing muting should be a constant standard R / G / B value to improve the saturation of the image at power-on. By adding, the level of the fed back value of the red cathode output is increased late, causing a long mute time.

Accordingly, the present invention has been made in view of the above problems, and in order to improve the blooming phenomenon and reduce the mute time by changing a routine for checking a sense input level that takes most of the mute time in order to reduce the mute time. It is an object of the present invention to provide a method for reducing the screen display time of a television.

1 is a block diagram showing the configuration of a conventional sense feedback circuit.

FIG. 2 is a circuit diagram illustrating a configuration of a sense input terminal of the color output and deflection output processor of FIG. 1. FIG.

3 is a measurement timing diagram of the color output and deflection output processor of FIG.

4 is a diagram illustrating input and output waveforms of the sense input terminal and the output terminal of the video output amplifier of FIG.

5 is a flowchart illustrating an operation method of an initial operation of a television at a conventional power-on;

6 illustrates input and output waveforms of a sense input terminal and an output terminal of a video output amplifier according to FIG. 5.

7 is an operation flowchart of a method for shortening a screen display time of a television according to the present invention;

8 is a diagram illustrating input and output waveforms of a sense input terminal and an output terminal of a video output amplifier according to FIG. 7.

According to the present invention for achieving the above object, when the reset is high, the waiting time after turning on the degauss is reduced to zero, the waiting time before the video processor initialization is reduced to 0.2 seconds, and the waiting time is reduced to zero, and I After initializing the ² C bus, reduce the waiting time to zero, initialize the color output and deflection output processor, auto-microprocessor, and PIP processor, turn on the mute, check the power supply short circuit, and check the standard R / G / B output size. Setting a to 0 to output standard R / G / B; After executing the first step, set the CUT_DIS register to 1 to slow down the control loop, wait for 3 seconds while heating the color picture tube, turn on the blueback, wait for about 0.6 seconds, and then wait the slowest window open operation. A second step of treating with; After executing the second step, the third step of substituting the data of the service mode function to the standard R / G / B output size, recording the standard R / G / B and white R / G / B and unmuting It features.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 7 is a flowchart illustrating a method for shortening a screen display time of a television according to the present invention. As shown in FIG. 7, when the reset becomes high, the waiting time after turning on the degauss is reduced to 0, and the waiting time before the video processor initialization is 0.2 seconds. Reduce the wait time to zero and reset the I ² C bus, then reduce the wait time to zero, reset the color output and deflection output processor, auto-microprocessor, and PIP processor, turn on mute, and turn off the power short. Checking and setting the standard R / G / B output size to 0 to output standard R / G / B (S41 to S66); After executing the first step (S41 ~ S66), set the CUT_DIS register to 1 to slow down the control loop, wait 3 seconds while heating the color picture tube, turn on the blue back, wait about 0.6 seconds, and then open the window. A second step (S67 to S71) of processing the operation at the latest speed; After the execution of the second step (S67 ~ S71), substituting the data of the service mode function to the standard R / G / B output size, recording the standard R / G / B and white R / G / B, and mute An embodiment of the present invention will be described as being composed of three steps (S72 to S74).

During the initialization of the program, the standby time is reduced by about 700mS.Detailed explanation is 300mS after the degaus is turned on, but after the reset to 0, 500mS after the reset is low. But waited for 100mS after initializing the I ² C bus but decreased it to 0.

Subsequently, the process is the same as the conventional flowchart except that the routine for checking the level of the sense input terminal is changed.

The improved routine handles the same as recording the stored values when adjusting the screen voltage, waits 3 seconds to heat the color picture tube in that state, turns on the blueback, waits for about 600mS, and then waits for the slowest window open operation. Process at speed.

Then, the service data is assigned to the standard R / G / B output size, and the standard R / G / B is output and muted off.

Here, by changing the standard R / G / B output size from 60 to 4, by reducing the reference data value of the corresponding register to reduce the standard R / G / B measurement current amount, the abrupt change in the beam current is prevented. Improved blooming phenomenon.

In addition, the voltage is analog / digital converted as shown in the prior art and appears as a cut-off value in the control program. Since the value exists from 0 to 256, the maximum level should not exceed 1.6V. When the reference value is 0.7V, the cutoff value is about 128.

FIG. 8 is a diagram illustrating input and output waveforms of the sense input terminal and the output terminal of the video output amplifier according to FIG. 7. After the power is turned on, it takes about 5 seconds to turn on the blue back. It can be seen that about 3 seconds has been reduced from 10.78 seconds to 7.76 seconds.

In addition, the above method does not change the muting time due to color picture tube deviation and always has a constant time.

As described in detail above, the present invention has the effect of improving the conventional problem that the television screen is turned on late by reducing the mute time, and improving the blurring phenomenon of the screen focusing by processing the window open operation at the latest speed. .

Claims (2)

When reset is high, the wait time after degaussing is reduced to zero, the wait time before video processor initialization is reduced to 0.2 seconds, after wait time is reduced to zero, and after the I ² C bus is initialized, A first step of initializing the color output and deflection output processor, the automatic microprocessor, and the PIP processor, turning on muting, checking for power short-circuit, and setting the standard RGB output size to 0 to output standard RGB; After executing the first step, set the CUT_DIS register to 1 to slow down the control loop, wait for 3 seconds while heating the color picture tube, turn on the blueback, wait for about 0.6 seconds, and then wait the slowest window open operation. A second step of treating with; And a third step of substituting the data of the service mode function to the standard RGB output size, recording the standard RGB and the white RGB, and releasing the mute after executing the second step. The method of claim 1, wherein in the third step, a standard R / G / B size of data of a service mode function is changed from 60 to 4 to prevent a sudden change in beam current. Way.