KR19980078792A - TV horizontal screen automatic adjustment device - Google Patents

Abstract

The present invention provides an apparatus for automatically adjusting the horizontal screen width of a television to automatically adjust the horizontal position of an image reproduced on a CRT screen of the television based on a reference horizontal point.

To this end, the present invention is horizontal to the horizontal deflection coil 22 of the CRT 20 by the horizontal deflection drive signal generated by performing the horizontal oscillation operation by the horizontal synchronizing signal from the video signal separated from the synchronization separator 24. A horizontal deflection driver 26 for deflecting and a flyback transformer 28 for generating a high voltage by driving the horizontal deflection driver 26 and generating an ABL voltage for automatically limiting the brightness of an image signal. A horizontal adjustment width detecting means (30) which receives an ABL voltage from the flyback transformer (28), detects a difference in the horizontal adjustment width for the video signal, and generates a horizontal adjustment width detection signal; Receives the horizontal adjustment width detection signal from the horizontal adjustment width detection means 30, recognizes the difference in the horizontal adjustment width with respect to the playback screen of the CRT 20, and determines the difference in the horizontal adjustment width. Control means 34 for generating a horizontal adjustment control signal for adjusting the upper and lower horizontal playback positions to the center of the screen, and moving the horizontal screen playback position to the screen center by receiving a horizontal adjustment control signal from the control means 34; And horizontal width adjusting means 36 for applying a horizontal adjustment signal to the horizontal deflection driving portion 26, so that automatic adjustment of the horizontal playback position is possible without manual adjustment at the time of factory shipment or purchase of the television. As possible, the viewing effect is maximized.

Description

TV horizontal screen automatic adjustment device

The present invention relates to a device for automatically adjusting the horizontal screen width of a television, and more particularly, to automatically adjust the horizontal position of a video screen to the center of the screen for the entire screen area of a CRT screen. Relates to a device.

Currently, televisions which are generally used are selectively tuned to a predetermined broadcast channel among a plurality of channels transmitted from a plurality of television stations to perform video / audio processing, thereby reproducing a video signal through a CRT (Cathode Ray Tube) screen. The audio signal can be reproduced through the speaker. For the reproduction of the video screen through the CRT, the R / G / B color signals obtained from the video signal are respectively R / G / B through the R / G / B electron gun. It is radiated as an electron beam and irradiated to the R / G / B fluorescent surface through an Apertuer Grill or a Shadow Mask so that a predetermined image is reproduced.

For the R / G / B electron beam emitted through the R / G / B electron gun in the CRT of such a television, the scanning deflection for the vertical picture is adjusted in synchronization with the vertical synchronization signal of 60 Hz by the vertical deflection coil installed in the CRT. In addition, the scanning deflection of the horizontal image can be adjusted in synchronization with the horizontal synchronization signal of the composite video signal by the horizontal deflection coil.

Further, according to the vertical / horizontal deflection device employed to apply the vertical / horizontal deflection pulses to the vertical / horizontal deflection coils respectively, the vertical deflection device is vertically oscillated by the integral value of the vertical synchronization signal separated from the composite video signal. Operation to generate a sawtooth voltage and apply it as a vertical deflection pulse.In the case of a horizontal deflection device, the oscillation operation is performed by a horizontal synchronizing signal, and a phase difference between the oscillation voltage and the frequency of the horizontal synchronizing signal is generated. By applying the sawtooth wave current to the horizontal deflection coil, the horizontal deflection can be adjusted, the generation of high voltage through the flyback transformer, the generation of the operating power applied to the image output circuit, or the anode / focus current of the CRT. It is also to be generated.

On the other hand, such a horizontal deflection device manually performs a horizontal adjustment operation so that the horizontal screen position of the CRT screen is reproduced at the center of the screen centered on the effective video area of the video signal before the television is manufactured and shipped from the factory. In addition, it is possible to check whether the screen status is abnormal.

However, in such a television, the horizontal adjustment operation for the CRT screen that is performed before the factory shipment at the time of manufacture is required, so that not only a large number of adjustment personnel are required but also the adjustment time is long, and the viewer who purchases the television is required. Even though the adjustment of the horizontal screen position of the CRT screen is not easy, there is a disadvantage in that accurate adjustment is not made.

Accordingly, the present invention has been made in view of the above circumstances, and provides a horizontal screen width automatic adjustment device for a television which allows the horizontal position of an image reproduced on a CRT screen of a television to be automatically adjusted based on a reference horizontal point. The purpose is to.

In order to achieve the above object, according to the apparatus for automatically adjusting the horizontal screen width of a television according to the present invention, the horizontal deflection drive signal generated by performing the horizontal oscillation operation by the horizontal synchronizing signal from the video signal separated from the synchronization separating unit A horizontal deflection driver for horizontal deflection of the horizontal deflection coil of the CRT, and a flyback transformer for generating high voltage by driving the horizontal deflection drive part and generating an ABL voltage for automatically limiting the brightness of the image signal. A television comprising: horizontal adjustment width detection means for receiving an ABL voltage from the flyback transformer and detecting a difference in the horizontal adjustment width for a video signal, and generating a horizontal adjustment width detection signal, and a horizontal from the horizontal adjustment width detection means Difference value of the horizontal adjustment width with respect to the playback screen of the CRT by receiving the adjustment width detection signal A control means for recognizing and compensating for the difference in the horizontal adjustment width to generate a horizontal adjustment control signal for adjusting the horizontal reproduction position to the center of the screen, and receiving the horizontal adjustment control signal from the control means to display the horizontal image reproduction position. Provided is a horizontal screen width automatic adjustment device for a television, comprising a horizontal width adjustment means for applying a horizontal adjustment signal for moving to the center to the horizontal deflection driver.

According to the present invention configured as described above, the difference in the horizontal adjustment width is detected on the basis of the reference pulse with respect to the ABL voltage generated from the flyback transformer in the television, and the horizontal difference in the CRT screen is compensated by compensating the difference in the detected horizontal adjustment width. Since the playback position can be automatically adjusted to the center of the screen, the horizontal screen position can be automatically adjusted before the factory is shipped out after the completion of production of the television or after the purchase of the television.

1 is a block diagram showing a horizontal screen width automatic adjustment apparatus for a television according to the present invention;

2 is a block diagram showing a detailed configuration of the horizontal adjustment width detection unit shown in FIG. 1 according to a preferred embodiment of the present invention;

3 is a timing chart for explaining the adjustment operation of the horizontal screen width according to a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

2: receiving antenna, 4: tuner,

6: video IF part, 8: external signal jack,

10: external signal input terminal, 12: mode switching unit,

14: video amplifier, 16: video signal processor,

18: video output unit, 20: CRT,

22: horizontal deflection coil, 24: synchronous separator,

26: horizontal deflection drive, 28: flyback transformer (FBT),

30: horizontal adjustment width detection unit, 32: function setting unit,

34: control unit, 36: horizontal width adjustment unit,

40: phase detection / clock oscillation unit, 42: reference pulse generator,

44: comparator, 46: pulse difference detection unit,

48: Signal multiplier.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a horizontal screen width automatic adjustment apparatus for a television according to the present invention. In the apparatus of the present invention, reference numeral 4 denotes channel channel selection data for tuning a predetermined channel from the control unit 34, which will be described later. 6 shows a tuner which selects a channel among a plurality of channels induced by the reception antenna 2 and outputs it as an intermediate frequency signal mixed with a local oscillation frequency signal, and 6 indicates a television broadcast signal in the form of the tuned intermediate frequency signal. An image IF portion to be subjected to intermediate frequency amplification is shown.

Also, reference numeral 8 denotes an external signal jack connected to an external video player such as a video tape recorder or a laser disc player, or a pattern video generator for generating a predetermined pattern video signal (see FIG. 3) for automatic adjustment of the horizontal playback position. 10 denotes an external signal input terminal for receiving an external image signal or a pattern image signal at high input impedance through the external signal jack 8.

Also, reference numeral 12 is a mode switching control by the control unit 34 to be described later, and the broadcast signal tuned by the tuner 4 or the external signal from the external signal input terminal 10 in accordance with the broadcast reproduction mode or the external signal reproduction mode. A mode switching unit for forming a signal path for a video signal (or a pattern video signal).

Reference numeral 14 denotes an image amplifier which amplifies the image signal through the mode switching unit 12 to an amplification level capable of image signal processing, and 16 denotes a luminance signal by performing signal amplification on the signal amplified image signal. And an image signal processing unit for performing luminance adjustment and contrast adjustment, and performing color demodulation and color demodulation on the chromaticity signal through a band amplification operation to generate an R / G / B color signal obtained by combining the luminance signal and the color signal. 18 denotes an image output unit which is amplified and driven by the image signal processed R / G / B color signal to reproduce an image on a CRT screen.

Also, reference numeral 24 denotes a synchronization separator which separates a synchronization signal from the image signal from the image amplifier 14 and extracts a horizontal synchronization signal, and 26 denotes a horizontal oscillation operation and an AFC operation by the extracted horizontal synchronization signal. By applying a horizontal deflection drive signal for the horizontal deflection operation of the video screen to the horizontal deflection coil 22 of the CRT 20 and receiving a horizontal width adjustment signal from the horizontal width adjustment unit 36 to be described later. A horizontal deflection drive unit for varying the horizontal deflection drive state to change the horizontal reproduction position with respect to the CRT screen.

In addition, reference numeral 28 is a high voltage power source such as an anode voltage and a focus voltage applied to the CRT 20 side by the driving operation of the horizontal deflection driving unit 26, and the luminance value of the luminance signal of the image signal is applied. A flyback transformer for generating an ABL voltage for automatically limiting is shown, and 30 denotes a flyback transformer that receives the ABL voltage from the flyback transformer 28 and applies the ABL voltage to the ABL voltage based on a reference pulse corresponding to the effective video region of the video signal. Indicates a horizontal adjustment width detection unit that detects a difference between the horizontal adjustment widths and generates a horizontal adjustment width detection signal.

Here, as shown in FIG. 2, the horizontal adjustment width detection unit 30 receives a horizontal synchronization signal from the synchronization separation unit 24 to perform a PLL operation such as phase detection and clock oscillation operation. 40 and a reference for generating a reference pulse signal corresponding to the effective video region W by the clock signal CK generated through the oscillation operation of the phase detection / clock oscillator 40 by receiving the horizontal synchronization signal. As a result of receiving the ABL voltage from the flyback transformer 28 through the pulse generator 42 and its non-inverting terminal (+), and comparing it with the reference voltage Vref applied to the inverting terminal (-), The difference value of the horizontal adjustment width is detected by the comparator 44 which generates a level detection signal (A; see FIG. 3), and the ABL level detection signal (A) on the basis of the reference pulse signal from the reference pulse generator 42. Pulse difference generating one pulse difference detection signal (b; FIG. 3) A signal generated as a horizontal adjustment width detection signal (refer to FIG. 3) by receiving the pulse difference detection signal (b) from the output section 46 and the pulse difference detection section 46 and multiplying the clock signal CK. Multiplier 48 is configured.

Further, reference numeral 32 is composed of a matrix button unit provided in a predetermined portion of a remote controller for remote control or the main body of the main body, and has a general function such as mode switching to a broadcast play mode or an external signal play mode, a switch of a broadcast channel, or a volume control operation. A function setting section for key setting an execution command is shown.

Further, reference numeral 34 denotes a control unit which performs execution control on the overall functional operation assigned to the television in accordance with a key operation of the function setting unit 32, and the control unit 34 is provided from the horizontal adjustment width detection unit 30. The horizontal adjustment width detection signal C is applied to control the horizontal reproduction position of the CRT screen to be moved to the center of the screen by compensating for the horizontal adjustment width.

Here, the control section 34 has a generation period of the clock signal corresponding to the difference value of the horizontal width detected by the horizontal adjustment width detection signal (C) is Td ( s), the number of counts of the clock signal CK is defined as T, the clock frequency of the clock signal CK is defined as Fc, and the interval between the syringes in the effective image area W is 58, 5 ( s), it is determined by the formula Td = T x (1 / Fc), and is determined by the variable amount of horizontal width M = number of steps x (Td / 58.5) to compensate for the difference in the horizontal width. The horizontal width adjusting unit which defines the total number of steps, for example, 0 to 63 (64 steps in total), generates a horizontal adjustment control signal based on a predetermined number of steps indicating the variable amount M of the horizontal width. 36 will be controlled.

Reference numeral 36 denotes a horizontal regeneration position at the center of the screen of the CRT 20 by controlling the horizontal deflection driving operation of the horizontal deflection driving unit 26 by receiving a horizontal adjustment control signal from the control unit 34. A horizontal width adjusting section which performs an adjusting operation for moving is shown.

Next, the operation of the present invention made as described above will be described in detail with reference to the accompanying drawings.

First, the pattern image generator is connected to the external signal jack 8 before the TV is completely manufactured and shipped from the factory, so that the effective image region W has a predetermined back level as shown in FIG. When the patterned pattern image signal is input to the external signal input terminal 10 and the mode switching unit 12 is mode switched to the external signal reproduction mode, the image amplifying unit 14 is the mode switching unit 12. The signal signal is amplified by the pattern image signal, and the image signal processor 16 performs image signal processing on the signal amplified pattern image signal and reproduces it on the screen of the CRT 20 through the image output unit 18.

Meanwhile, the synchronizing separator 24 extracts a horizontal synchronizing signal by separating the synchronizing signal from the pattern image signal, and the horizontal deflection driving unit 26 performs a horizontal oscillation operation by the horizontal synchronizing signal to perform a horizontal deflection driving signal. While generating a horizontal deflection operation with respect to the horizontal deflection coil 22 of the CRT (20), the flyback transformer 28 is the CRT (20) through the drive operation of the horizontal deflection drive unit 26 In addition to generating a high voltage signal to be supplied, ABL voltage for automatically limiting the luminance of the pattern image signal is generated.

In this state, the phase detection / clock oscillation unit 40 of the horizontal adjustment width detection unit 30 receives the horizontal synchronization signal to perform a PLL operation such as a phase detection operation and a clock oscillation. In FIG. 3, a reference pulse having a short pulse is applied to the horizontal synchronization signal and is synchronized with the clock signal CK from the phase detection / clock oscillator 40 to be synchronized with the effective image area W as shown in FIG. 3. Will generate a signal.

At this time, the comparator 44 receives the ABL voltage from the flyback transformer 28 to the non-inverting terminal (+) and compares it with the reference voltage Vref applied to the inverting terminal (-). As shown in FIG. 3, the ABL level detection signal (a) biased toward one side is generated with respect to the center of the screen of the CRT 20, and the pulse difference detection unit 46 generates the reference pulse signal from the reference pulse generator 42. As the ABL level detection signal is applied to detect the difference value of the horizontal adjustment width, the pulse difference detection signal B is generated as shown in FIG. 3, while the signal multiplier 48 detects the pulse difference detection. The signal B is multiplied by the clock signal CK from the phase detection / clock oscillator 40 and output as a horizontal adjustment width detection signal c.

Accordingly, the control section 34 receives the horizontal adjustment width detection signal (C) from the signal multiplier 48 and clocks the clock signal according to the clock period 1 / Fc and the count number T of the clock signal CK. The generation period Td of the detection signal including the signal CK is obtained, for example, 58.5 The number of steps corresponding to the variable amount M of the horizontal adjustment width is obtained by applying the generation period Td of the detection signals between the syringes in the effective image area W of s and 63 steps such as 0 to 63, for example. For example, if Td is 10, the number of steps is obtained by 11 steps, and a horizontal adjustment control signal is generated for moving the horizontal reproduction position with respect to the center of the CRT 20 screen based on the 11 steps.

As a result, the horizontal width adjustment unit 36 receives the horizontal adjustment control signal from the control unit 34 to vary the horizontal driving state with respect to the horizontal deflection driving unit 26 so that the image is displayed at the center of the screen of the CRT 20. The horizontal reproduction position of the signal is moved.

According to the present invention made as described above, the television detects the difference value of the horizontal adjustment width for the video signal reproduced on the CRT screen through the ABL voltage, and moves the horizontal reproduction position of the video signal to the center of the screen based on the difference value. As a result, the horizontal playback position can be automatically adjusted without manual adjustment when the TV is shipped from the factory or purchased, and the viewing effect can be maximized.

Claims (2)

The horizontal deflection drive signal generated by performing the horizontal oscillation operation by the horizontal synchronizing signal from the video signal separated from the synchronizing separator 24 causes the horizontal deflection of the horizontal deflection coil 22 of the CRT 20 to be made. A television having a horizontal deflection driver 26 and a flyback transformer 28 for generating high voltage by driving the horizontal deflection driver 26 and generating an ABL voltage for automatically limiting the brightness of a video signal. In Horizontal adjustment width detecting means 30 which receives the ABL voltage from the flyback transformer 28 and detects a difference value of the horizontal adjustment width for the video signal and generates a horizontal adjustment width detection signal; Receives the horizontal adjustment width detection signal from the horizontal adjustment width detection means 30, recognizes the difference of the horizontal adjustment width with respect to the playback screen of the CRT 20, compensates the difference of the horizontal adjustment width, and moves the horizontal reproduction position to the center of the screen. Control means (34) for generating a horizontal adjustment control signal for adjusting; A horizontal width adjusting means 36 which receives a horizontal adjustment control signal from the control means 34 and applies a horizontal adjustment signal to the horizontal deflection driver 26 for moving the horizontal screen reproduction position to the center of the screen; Horizontal screen width automatic adjustment device, characterized in that configured. 2. The phase detection / clock oscillation unit 40 according to claim 1, wherein the horizontal adjustment width detection unit 30 detects a signal phase with respect to the horizontal synchronization signal and performs a clock oscillation operation, and the phase detection based on the horizontal synchronization signal. A reference pulse generator 42 which receives the clock signal CK from the clock oscillator 40 and generates a reference pulse signal corresponding to the effective video region W of the video signal, from the flyback transformer 28; A comparator 44 which generates an ABL level detection signal as a result of receiving the ABL voltage of and comparing it with the reference voltage Vref, and a pulse corresponding to the difference in the horizontal adjustment width with respect to the ABL level detection signal based on the reference pulse signal. A pulse difference detection unit 46 for detecting a difference value and a signal multiplier 48 which multiplies the clock signal CK by the pulse difference detection signal from the pulse difference detection unit 46 and generates the horizontally adjusted width detection signal. Configuration Unit horizontal width of the screen of the television, characterized in that automatic adjustment.