KR100201998B1 - Apparatus for converting screen size by detecting watching position in television - Google Patents

Abstract

According to the present invention, when a viewer views a biased position with respect to the front position of a video screen on a television, the viewing position of the television can be played by turning the video screen to the left or right in response to the biased viewing state. Provide screen resizing device.

To this end, the present invention oscillates by the horizontal / vertical synchronous signal from the composite video signal according to the television broadcast separated by the synchronization separating unit 18, so that the image screen is displayed on the horizontal / vertical deflection coils 74 and 102 of the CRT 16. FIG. A television equipped with horizontal / vertical deflection driving units (20, 22) for generating horizontal / vertical deflection pulses for horizontal / vertical deflection adjustment of a TV, the viewer having a predetermined angle with respect to the front of the screen of the CRT (16) of the television. A viewing distance detecting means for detecting a viewing biasing position of the viewer, a viewing angle detecting means 36 for detecting a viewing biasing angle based on a detection signal for the viewing biasing position of the viewer from the viewing distance detecting means, and the CRT 16 Horizontal / vertical deflection adjustment data for adjusting the horizontal / vertical deflection of the horizontal / vertical deflection coils 74 and 102 in order to vary the deflection state of the image screen in response to the viewing angle of the viewer's viewing angle with respect to the screen. Memory means 38 and the viewing angle detection means 36 receive and recognize the detection data of the viewing declination angle for the viewer and store the horizontal / vertical deflection from the memory means 38 corresponding to the viewing declination angle. The horizontal deflection driving unit by receiving the horizontal deflection adjustment data from the memory means 38 under control of the control means 40 and control means 40 for controlling the adjustment data to change the horizontal / vertical deflection state; Horizontal deflection control signal generating means 42 for generating a horizontal deflection control signal for varying the horizontal deflection output state with respect to 20, and vertical deflection from the memory means 38 under the control of the control means 40; A vertical deflection control signal generating means (43) which receives the adjustment data and generates a vertical deflection control signal for varying the vertical deflection output state with respect to the vertical deflection driving unit (22); Than the configured features.

Description

Screen size adjusting device according to the viewing position of television

The present invention relates to an apparatus for adjusting the screen size according to a viewing position of a television, and more particularly, based on a detection value of a viewing position of a viewer on a television, a deflection position of a video screen is changed to a left deflection or a postal deflection. It relates to a screen size adjusting device according to the detection of the viewing position of the television.

Currently, televisions that are generally used are subjected to video / audio processing by selectively selecting a predetermined channel among a plurality of channels transmitted from a plurality of television broadcasting stations, so that a video signal is reproduced through a CRT (Cathode Ray Tube) screen and an audio signal. For the reproduction of the video screen through the CRT, the R / G / B signals obtained from the video signals are respectively R / G / B electron beams through the R / G / B electron guns. It is radiated and irradiated to the R / G / B fluorescent surface through an Apertuer Grill or a shadow mask so that a predetermined image is reproduced.

In the case of the R / G / B electron beam emitted through the R / G / B electron gun in the CRT of such a television, the scanning deflection of the vertical screen is synchronized with the vertical synchronization signal of 60 Hz by the vertical deflection coil installed in the CRT. In addition to the adjustment, the horizontal deflection coil makes it possible to adjust the scanning deflection for the horizontal screen in synchronization with the horizontal synchronization signal of the composite video signal.

In addition, in order to apply vertical / horizontal deflection pulses to the vertical / horizontal deflection coils, a vertical / horizontal deflection circuit is required. In the case of a vertical deflection circuit for deflecting the vertical deflection coil, it is separated from the composite video signal. The vertical oscillation operation is performed by the integral value of one vertical synchronizing signal, so that the sawtooth wave voltage can be generated and applied as a vertical deflection pulse.In the case of the horizontal deflection circuit, the oscillation operation is performed by the horizontal synchronizing signal and the oscillation voltage By applying the sawtooth wave current generated by detecting the phase difference with respect to the frequency of the signal to the horizontal deflection coil, the horizontal deflection can be adjusted, and the generation of high voltage through FBT or the generation of operating power applied to the image output circuit or the The anode / focus current can also be generated.

However, in such a television, the vertical / horizontal deflection circuit is configured to perform a fixed vertical / horizontal deflection operation by a vertical / horizontal deflection pulse having an oscillation frequency synchronized with the vertical / horizontal synchronization signal from the composite video signal. If the viewer inevitably needs to watch too far to the right or to the left of the front of the CRT screen, the image played on the opposite screen region with respect to the viewing position is far from the field of view, and the balanced viewing of the entire screen is impossible. There is a disadvantage.

Accordingly, the present invention has been made in view of the above-described circumstances, and when a state in which a viewer views a biased state with respect to the front position of a video screen is sensed on a television, the video screen is left-shifted or mailed in response to the biased viewing state. It is an object of the present invention to provide a screen size adjusting device according to the sensing position of a television to enable a user to make it.

According to the screen size adjusting device according to the detection position of the television according to the present invention in order to achieve the above object, the oscillation operation by the horizontal / vertical synchronous signal from the composite video signal according to the television broadcasting separated by the synchronization separator A television having a horizontal / vertical deflection driver for generating horizontal / vertical deflection pulses for horizontal / vertical deflection adjustment of a video screen on each horizontal / vertical deflection coil of a CRT, having a predetermined angle with respect to the front of the CRT screen of the television. Installed on the viewing distance detecting means for detecting the viewing biasing position of the viewer, the viewing angle detecting means for detecting the viewing biasing angle based on a detection signal of the viewing biasing position of the viewer from the viewing distance detecting means, and the CRT screen. The horizontal / vertical deflection coils to change the deflection state of the video screen corresponding to the viewing deflection angle of the viewer. Memory means for storing horizontal / vertical deflection adjustment data for adjustment of horizontal / vertical deflection; and from the memory means corresponding to the viewing-declination angle by receiving and recognizing detection data of the viewing-declination angle for the viewer from the viewing-angle detection means; Control means for controlling the horizontal / vertical deflection adjustment data to vary the horizontal / vertical deflection state, and under the control of the control means, horizontal deflection adjustment data from the memory means is applied to the horizontal deflection drive unit; Horizontal deflection control signal generating means for generating a horizontal deflection control signal for varying the output state, and under the control of the control means, vertical deflection adjustment data from the memory means is applied to determine a vertical deflection output state for the vertical deflection drive unit. Vertical deflector for generating a vertical deflection control signal for varying Provided is a screen size adjusting device according to the detection of the viewing position of a television comprising a signal signal generating means.

According to the present invention configured as described above, if a biased viewing condition of a video screen is detected by a viewer in a state in which a television broadcast signal is tuned on a television and reproduced through a CRT, corresponding to an audiovisual angle detected by the detected state By varying the horizontal / vertical deflection state of the horizontal / vertical deflection coil, the screen size can be converted and reproduced centering on the viewing position of the viewer.

1 is a schematic diagram showing an arrangement example of a distance sensor for detecting a viewing position for screen size adjustment according to a preferred embodiment of the present invention;

Figure 2 is a block diagram showing a screen size adjustment device according to the detection position of the television according to the present invention,

3 is a diagram illustrating a detailed circuit configuration of a distance sensor and an audiovisual angle detector for detecting a viewing position shown in FIG. 2 according to a preferred embodiment of the present invention;

4 is a block diagram showing a detailed configuration of the horizontal deflection driving unit and the horizontal deflection control signal generating unit shown in FIG. 2 according to a preferred embodiment of the present invention;

FIG. 5 is a waveform diagram illustrating a state in which a horizontal deflection signal is varied according to a state in which a horizontal deflection control signal is generated in the horizontal deflection control signal generator shown in FIG. 4;

6 is a block diagram showing a detailed configuration of the vertical deflection driving unit and the vertical deflection control signal generating unit shown in FIG. 2 according to a preferred embodiment of the present invention;

FIG. 7 is a waveform diagram illustrating a state in which a vertical deflection signal is changed according to a state in which the vertical deflection control signal is generated in the vertical deflection control signal generator shown in FIG. 6;

8 is a diagram illustrating a state in which a screen size is reproduced by postal or leftward deflection in correspondence with an audiovisual angle according to a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

18: synchronous separator, 20: horizontal deflection drive,

22: vertical deflection driving unit, 28: function setting unit,

30, 32, 34: distance sensor, 36: viewing angle detection unit,

38: data memory, 40: control unit,

42: horizontal deflection control signal generator, 43: vertical deflection control signal generator,

46,48,50: Analog comparator, 52,54,56: ADC,

58, 60, 62: digital comparator, 64: angle calculation unit,

66: AFC circuit, 68: oscillation circuit,

70: horizontal drive circuit, 72: horizontal output circuit,

74: horizontal deflection coil, 76: flyback transformer,

82,104: data register, 84,106: data decoder,

86: counter circuit, 88: pulse phase shift unit,

90: Oscillation phase adjustment part, 92, 118: Selection switch part,

94: vertical oscillation circuit, 96: amplifier circuit

98: vertical driving circuit, 100: vertical output circuit,

102: vertical deflection coil, 108: PWM modulator,

110: integrating circuit, 112: reset counter,

114: subtraction circuit, 116: signal amplification circuit.

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

That is, Figure 1 is a schematic diagram showing an example of the arrangement of the distance sensor for detecting the viewing position for adjusting the screen size according to a preferred embodiment of the present invention, according to the figure is orthogonal to the front of the CRT (16) screen of the television A second distance sensor 32 for detecting a viewing distance at a viewing position is installed, and is spaced apart from the left and right sides of the second distance sensor 32 by a first angle A, respectively, for the screen of the CRT 16. Each of the first and third distance sensors 30 and 34 installed at an angle spaced by the second angle B to sense the viewing angle of the viewer on the left or right side of the viewer is provided.

FIG. 2 is a block diagram showing a screen size adjusting device according to a viewing position detection of a television according to the present invention. In the apparatus of the present invention, reference numeral 4 denotes channel channel selection data for channel selection from a control unit 40 to be described later. The channel is tuned through the receiving antenna (2) to receive the RF signal, and the RF signal is processed in high frequency, and the local oscillation frequency signal and the RF signal oscillated by the channel tuning data are mixed and output in the form of an intermediate frequency signal. 6 shows a video IF unit which performs video intermediate frequency amplification processing of the selected TV broadcast signal in the form of the selected intermediate frequency signal.

Also, reference numeral 8 denotes an image detector which detects the intermediate frequency-amplified television broadcast signal and separates only the composite video signal, and 10 denotes an image amplifier which amplifies the detected composite video signal to an image processing amplification level. Indicates.

Further, reference numeral 12 separates the luminance signal and the color difference signal from the signal-amplified composite video signal, and synthesizes the result as an R / G / B signal through luminance adjustment processing and color demodulation processing of the luminance signal. 14 denotes an image output unit for amplifying an R / G / B signal generated as a result of the image signal processing and reproducing it on a CRT 16 screen.

Reference numeral 18 denotes a synchronous separator for separating a composite synchronous signal from the composite image signal from the image amplifier 10 to extract a horizontal / vertical synchronous signal, and 20 denotes an oscillation operation by the extracted horizontal synchronous signal. Denotes a horizontal deflection driver for generating a horizontal deflection drive signal for adjusting the deflection of the horizontal scan with respect to the R / G / B electron beam of the CRT 16, wherein 22 is oscillated by the extracted vertical synchronization signal. A vertical deflection driver for generating a vertical deflection drive signal for adjusting the deflection of the vertical scan with respect to the R / G / B electron beam of the CRT 16 by performing an operation.

Further, reference numeral 24 denotes an audio detector for detecting and separating an audio signal from a television broadcast signal intermediately amplified by the video IF unit 6, and 26 denotes an amplification of the detected audio signal. An audio signal processing unit for performing volume adjustment.

Reference numeral 28 denotes a function setting section for key setting commands for performing general function operations, such as switching of broadcast channels and volume adjustment, which is made up of a matrix button section provided in a remote control unit for remote control or a predetermined control panel of a main body.

Reference numeral 36 denotes an audio visual angle detection unit that detects the viewing bias angle of the viewer by receiving the viewing bias position detection values from the first, second, and third distance sensors 30, 32, and 34.

Here, the first, second and third distance sensors 30, 32, 34 are the first, second and third oscillator 30A, which performs the oscillation operation for generating the ultrasonic signal, as shown in FIG. 32A, 34A, first and second and third transmitters 30B, 32B, and 34B for transmitting the oscillated ultrasonic signals to the front and left and right sides of the CRT 16, respectively, and the ultrasonic waves transmitted and returned. First and second and third receiving processing units 30C, 32C, and 34C, respectively, which receive signals and generate voltage signals according to time differences from the time of oscillation to reception, are included.

At this time, the audio-visual detection unit 36 is the first, second and third reception processing unit 30C, of the first and second and third distance sensors 30, 32, 34, as shown in FIG. The voltage signals generated from 32C and 34C, respectively, are applied to the non-inverting terminals (+), respectively, and are compared with the reference signals generated from the reference signal generator 44 and applied to the inverting terminals (-), respectively, in an analog manner. The first and second and third analog comparators 46, 48 and 50 and the first to digitally convert the output signals output from the first and second and third analog comparators 46, 48 and 50, respectively. And a first digital comparator for digitally comparing the second and third ADCs (52, 54, 56; Analog-Digital Converter) and the digital signal from the first ADC (52) with the digital signal from the second ADC (54). (58) a second digital ratio for digitally comparing the digital signal from the second ADC 54 with the digital signal from the third ADC 56; 60, a third digital comparator 62 for digitally comparing the digital signals from the first ADC 52 and the third ADC 56, and the first, second and third digital comparators ( And an angle calculation unit 64 which receives the comparison result signal of 58, 60, and 62, calculates the difference, and detects the viewer's viewing angle.

Further, reference numeral 38 denotes a data memory storing horizontal / vertical deflection adjustment data for changing the horizontal / vertical deflection state of the video screen reproduced on the CRT 16 to the left deflection or the postal deflection corresponding to the detected viewing declination angle. Indicates.

Reference numeral 40 denotes a control unit for controlling the overall function operation assigned to the television according to the key setting state of the function setting unit 28, and the control unit 40 is provided from the audio-visual detection unit 36. Recognizing the viewer's biased viewing angle by receiving the detection data for the viewing-biasing angle, the horizontal / vertical deflection coils 74 and 102 of the CRT 16 by the horizontal / vertical deflection adjustment data from the data memory 38. The data read control of the data memory 38 and the enable control and switching control of the horizontal / vertical deflection control signal generators 42 and 43 described later are performed to change the horizontal / vertical deflection state.

Reference numeral 42 denotes a horizontal deflection control for varying the horizontal deflection of the horizontal deflection coil 74 by receiving the horizontal deflection adjustment data from the data memory 38, the operation of which is enabled by the control unit 40. A horizontal deflection control signal generator for generating a signal is shown.

Here, the horizontal deflection control signal generator 42 includes a data register 82 for temporarily storing horizontal deflection adjustment data from the data memory 38, and the data register 82 as shown in FIG. The operation is enabled by the data decoder 84 and the control unit 40 to decode the horizontal deflection adjustment data and generate a counting control signal for varying the phase of the horizontal oscillation according to the bias of the video screen. A counter circuit 84 for generating a counting output that counts the clock signal CLK input by the counting control signal from the data decoder 84 and the horizontal synchronizing signal from the synchronizing separator 18 A pulse phase shift unit 88 for generating a horizontal synchronizing pulse in which the phase of the pulse is shifted by a counting output signal varied according to the deflection from the counter circuit 86; And an oscillation phase adjusting unit 90 for generating oscillation by a horizontally synchronized pulse of which the phase is variably shifted to generate a horizontal deflection control signal for varying the horizontal deflection of the video screen.

At this time, the horizontal deflection control signal generation section 42 includes a horizontal selection switch section 92 that is controlled to be controlled by the control section 40, and by the AFC circuit 66 of the horizontal deflection driving section 20. The horizontal deflection drive signal is compared with the phase of the horizontal synchronous signal and the horizontal deflection output signal, oscillated by the oscillation circuit 68 and driven and output by the horizontal drive circuit 70, or horizontal from the oscillation phase adjustment unit 90. Switching is provided to provide a signal path for selectively applying the deflection control signal to the horizontal output circuit 72.

On the other hand, the horizontal deflection control signal generation unit 42 is not generated as a result of the front view of the viewer's CRT (16) screen, the bias of the video screen is generated, as shown in Figure 5a to the horizontal synchronization signal The deflection pulse of the horizontal deflection drive signal is lowered so as to return the image scanning beam consistent with the horizontal retrace period.

In addition, the horizontal deflection control signal generator 42, when a slight bias watching by the viewer is generated as shown in Figure 5b the deflection pulse of the horizontal deflection drive signal is the pulse phase shift unit 88 In the case where the biased viewing condition of the viewer is severe, the horizontal retrace of the horizontal synchronizing signal is generated as shown in FIG. The phase shift of the vertical deflection drive signal with respect to the period is made suddenly so that the falling deflection pulse is out of the considerable period with respect to the horizontal retrace period.

However, in the horizontal deflection drive signal having different phases as shown in FIGS. 5A to 5C, when the viewer is biased, the deflection pulse of the horizontal deflection drive signal shown in FIG. 5A is closest to the viewer. The horizontal deflection operation is performed on the screen, and as the distance of the video screen becomes farther away from the viewer from the deflection pulse of the horizontal deflection drive signal shown in FIG. 5B to the deflection pulse shown in FIG. The degree is severe.

Also, reference numeral 43 is controlled by the control unit 40 to receive the vertical deflection adjustment data from the data memory 38 so that the vertical reference to the vertical deflection coil of the CRT 16 corresponds to the viewing bias position of the viewer. A vertical deflection control signal generator for generating a vertical deflection control signal for varying the deflection size is shown.

Here, the vertical deflection control signal generation unit 43 includes a data register 104 for temporarily storing vertical deflection adjustment data from the data memory 38 and the data register 104 as shown in FIG. A data decoder 106 which decodes the vertical deflection adjustment data and generates a vertical deflection adjustment signal for varying the vertical deflection state of the vertical deflection coil 102 according to the degree of declination of the video screen, and the decoded vertical deflection. PWM modulation unit 108 for processing pulse width modulation (Pulse Width Modulation), integrating circuit 110 for integrating the pulse width modulated vertical deflection adjustment signal as a DC component, horizontal by applying a horizontal synchronization signal The number of reset counters 112 for counting the retrace period so as to apply a reset signal to the data decoder 106 and the integrating circuit 110 to enable a reset output per one video scanning period. A subtraction circuit 114 which receives the vertical oscillation frequency signal according to the oscillation result from the vertical oscillation circuit 94 of the linear deflection driver 22 and subtracts the vertical deflection adjustment signal integrated through the integration circuit 110. And a signal amplifying circuit 116 for amplifying the vertical oscillation signal output as a result of the subtraction process and outputting the vertical oscillation signal as a vertical deflection control signal.

At this time, the vertical deflection control signal generation unit 43 includes a vertical selection switch unit 118 that is controlled to be controlled by the control unit 40, and is vertically generated by the vertical synchronization signal through the vertical oscillation circuit 94. The oscillation is performed and a vertical deflection drive signal applied through the amplification and waveform shaping operation of the amplifying shaping circuit 96 and the driving operation of the vertical driving circuit 98, or the vertical deflection control signal through the signal amplifying circuit 116 is performed. The switching operation is selectively performed to apply the vertical deflection coil 102 through the conduction operation of the vertical output circuit 100.

In addition, the vertical deflection control signal generator 43 subtracts the vertical size by the vertical deflection drive signal according to the result of the subtraction of the signal component by the subtraction circuit 114, as shown in FIG. The reset operation is performed per one image scanning period (1H) by the reset signal generated as a result of the counting of the horizontal synchronization signal of the reset counter 112, and the signal subtraction is performed for each image scanning period. .

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

First, when the television broadcast signal tuned from the tuner 4 and converted into an intermediate frequency signal is amplified by the image intermediate frequency through the image IF unit 6, the image detector 8 combines the intermediate frequency amplified television broadcast signal. The video signal is detected and separated, and the video signal processing unit 12 processes the video signal of the composite video signal amplified by the video amplification unit 10 and outputs the composite video signal in the form of an R / G / B signal. Accordingly, the image scanning beam by the R / G / B signal is scanned on the CRT 16 through the amplification operation of the image output unit 14.

At this time, the oscillation circuit 68 of the horizontal deflection driver 20 performs the oscillation operation by the horizontal synchronizing signal separated from the composite video signal by the synchronizing separator 18, and the horizontal synchronizing signal by the AFC circuit 66. The horizontal output circuit 72 performs the output drive under the control of the horizontal drive circuit 70 through the phase control between the horizontal deflection drive signal and the heater current and the focus current of the CRT 16 from the flyback transformer 76. The same high pressure is generated, and the horizontal deflection adjustment of the image scanning beam scanned on the CRT 16 by the horizontal deflection coil 74 is performed, while the vertical oscillation circuit 94 of the vertical deflection driver 22 The vertical oscillation operation is performed by the vertical synchronizing signal separated by the synchronization separating unit 18, and the vertical driving circuit 98 is driven by the amplification shaping circuit 96 through the amplifying operation and the waveform shaping operation. Vertical driving while circuit 100 is driven The vertical deflection adjustment for rosacea image Im on the CRT (16) will be written on the coil 102. The

In this state, when the bias viewing to the right by the viewer is made to the front of the screen of the CRT 16, the third distance sensor 34 detects the viewing position by transmitting and receiving an ultrasonic signal. The detection signal is generated, and the analog comparator 50 receives the detection signal and generates an output signal as a result of comparing the detection signal with the reference signal from the reference signal generator 44, while generating the third ADC 56. The digitally converted output data is input to the angle calculator 64 through data comparison by the first, second, and third digital comparators 58, 60, and 62, and through the angle calculator 64, respectively. The audiovisual angle is detected to generate angle detection data.

Accordingly, the control unit 40 recognizes the viewing angle through the angle detection data from the angle calculating unit 64, and access control to read out the horizontal / vertical deflection adjustment data corresponding to the viewing angle from the data memory 38. Meanwhile, the horizontal / vertical selection switch units 92 and 118 of the horizontal / vertical deflection control signal generators 42 and 43 are switched.

On the other hand, the horizontal deflection control signal generator 42 decodes the horizontal deflection adjustment data from the data memory 38 temporarily stored through the data register 82 as a counting control signal. The counter phase 86 causes the counting value for the clock signal CLK to be varied and output so as to correspond to the bias of the video screen, and the pulse phase shift unit 88 is output from the counter circuit 86. The pulse phase shift of the horizontal synchronous signal can be performed by a variable counting signal, while the oscillation phase adjusting unit 90 performs the oscillation operation by the horizontal pulse signal of which the pulse phase is shifted, thereby providing the horizontal deflection control signal. As the horizontal selection switch unit 92 is applied to the horizontal output circuit 72, the horizontal deflection coil 74 passes through the output drive of the horizontal output circuit 72. The horizontal deflection adjustment state of is varied.

In addition, in the vertical deflection control signal generation unit 43, the vertical deflection adjustment data from the data memory 38 temporarily stored by the data register 104 is decoded by the data decoder 106 to decode the vertical deflection adjustment signal. And a vertical deflection adjustment signal whose pulse width is modulated by the PWM modulator 108 is integrated into a DC component through the integrating circuit 110, but the horizontal synchronous signal of the reset counter 112 A reset signal is generated in units of one image scanning period by the counting operation for the horizontal retrace period, thereby resetting the operations of the data decoder 106 and the integrating circuit 110.

Accordingly, the subtraction circuit 114 of the vertical deflection control signal generator 43 receives the vertical oscillation signal according to the vertical oscillation result of the vertical oscillation circuit 94 constituting the vertical deflection driving unit 22 and the integrating circuit. The subtraction operation on the vertical deflection adjustment signal according to the integration result of 110 is performed in one image scanning period, while the signal amplification circuit 116 converts the subtracted vertical oscillation signal as a vertical deflection control signal. As the vertical output circuit 100 is applied to the vertical output circuit 100 through 118, the vertical deflection coil 102 is applied to the image scanning ratio on the CRT 16 through the variable output drive of the vertical output circuit 100. The vertical deflection is adjusted.

Accordingly, the horizontal / vertical deflection adjustment through the horizontal / vertical deflection coils 74 and 102 is variably performed by the horizontal / vertical deflection control signals generated from the horizontal / vertical deflection control signal generators 42 and 43. As shown in FIG. 8A, the screen size is gradually reduced while the deflection state of the left screen is changed compared to the right side of the CRT 16 screen.

Meanwhile, in the above-described embodiment of the present invention, as the viewer views the front of the screen of the CRT 16 to the left, the viewing angle is detected while the viewing position is detected by the first distance sensor 30. Even when the audiovisual angle is detected through the above, as the horizontal / vertical deflection control signal generators 42 and 43 perform the same operation as the above-described embodiment, the CRT 16 as shown in FIG. The screen size gradually decreases as the deflection state of the right screen is changed compared to the left side of the screen.

According to the present invention made as described above, by changing the deflection state of the video screen by detecting a state in which the viewing state of the viewer for the CRT screen on the television is biased, it is possible to change the screen size, the unavoidable bias of the viewer Even in the viewing state, there is an advantage that the normal viewing of the video screen becomes possible.

Claims (5)

The oscillation operation is performed by the horizontal / vertical synchronization signal from the composite video signal according to the television broadcast separated by the synchronization separating unit 18, so that the horizontal / vertical deflection of the video screen is applied to the horizontal / vertical deflection coils 74 and 102 of the CRT 16. In a television equipped with horizontal / vertical deflection driving units 20,22 for generating horizontal / vertical deflection pulses for adjustment, A viewing distance detecting means installed at a predetermined angle with respect to the front of the screen of the CRT 16 of the television to detect a viewing bias position of the viewer; Audio-visual angle detecting means (36) for detecting the viewing-angle-of-viewing angle based on a detection signal of the viewing-biasing position of the viewer from the viewing distance detecting means; Horizontal / vertical deflection adjustment data for adjusting the horizontal / vertical deflection of the horizontal / vertical deflection coils 74 and 102 in order to vary the deflection state of the image screen in response to the viewer's viewing-declination angle with respect to the CRT (16) screen. Stored memory means 38, The horizontal / vertical deflection adjustment data from the memory means 38 corresponding to the viewing-declination angle is recognized by the detection data of the viewing-degree angle for the viewer from the viewing-angle detection unit 36 and is recognized. Control means 40 for controlling to vary the Under the control of the control means 40, the horizontal deflection adjustment data received from the memory means 38 generates a horizontal deflection control signal for varying the horizontal deflection output state to the horizontal deflection drive unit 20. Control signal generating means 42, and Under the control of the control means 40, the vertical deflection adjustment data from the memory means 38 is applied to generate a vertical deflection control signal for varying the vertical deflection output state to the vertical deflection drive part 22. Screen size adjusting device according to the detection position of the television, characterized in that it comprises a control signal generating means (43). According to claim 1, wherein the viewing distance detecting means for the second distance sensor 32 for detecting the viewing state of the position orthogonal to the front of the CRT (16), with respect to the left and right of the distance sensor 32 And first and third distance sensors 30 and 34 spaced apart by a first angle A and spaced apart by a second angle B with respect to the screen of the CRT 16, respectively. Screen size adjusting device according to the viewing position of the television. The reference signal generating unit (44) according to claim 1 or 2, wherein the audio-visual detection means (36) receives the detection signals from the first, second and third distance sensors (30, 32, 34), respectively. Output signals from the first and second and third analog comparators 46,48 and 50 and the output signals from the first and second and third analog comparators 46, 48 and 50, respectively, First and second and third ADCs 52, 54 and 56 for digital conversion, and first and second digital comparisons of digital data through the first and second and third ADCs 52, 54 and 56. Comparing result data from the second and third digital comparators 58, 60 and 62 and the first and second and third digital comparators 58, 60 and 62, respectively, to detect the viewer's viewing-angle angle. And an angle calculation unit (64) for outputting one detection data. 2. The horizontal deflection control signal generating means (42) according to claim 1, wherein said horizontal deflection control signal generating means (42) includes a data register (82) for temporarily storing horizontal deflection adjustment data from said memory means (38), and a horizontal deflection through said data register (82). The data decoder 84 which generates the counting control signal for the pulse phase variation of the horizontal deflection by decoding the adjustment data, and the counter circuit 86 which variably counts the clock signal CLK by the counting control signal according to the decoding result. ), A pulse phase shift unit 88 for shifting the phase of the sync pulse based on a variable counting value from the counter circuit 86 by receiving a horizontal sync signal from the sync separator 18, and the phase being variable Oscillation phase adjustment unit 90 for generating a horizontal deflection control signal by oscillating operation so that the phase is changed by the shifted horizontal synchronizing pulse, and switching control by the control means 40 Control the horizontal deflection coil 74. The horizontal deflection control signal is selectively supplied to the screen size adjustment according to the viewing position of the television, characterized in that detection is configured with a horizontal selection switch unit 92 for switching operation to the device. 2. The vertical deflection control signal generating means (43) according to claim 1, wherein the vertical deflection control signal generating means (43) temporarily stores the vertical deflection adjustment data from the memory means (38) and the vertical deflection through the data register (104). A data decoder 106 for decoding the adjustment data to generate a vertical deflection adjustment signal, a PWM modulator 108 for performing pulse width modulation on the decoded vertical deflection adjustment signal, and performing the pulse width modulated vertical deflection adjustment signal. An integrating circuit 110 for integrating with a DC component, a reset counter for counting the horizontal synchronizing signal to generate a reset signal in units of one image scanning period, and for resetting the data decoder 106 and the integrating circuit 110. 112), a subtraction circuit 114 for receiving a vertical oscillation signal oscillated by the vertical deflection driver 24 and subtracting the vertical deflection adjustment signal from the integrating circuit 110; Signal amplification circuit 116 which amplifies a vertical oscillation signal and generates a vertical deflection control signal, and is controlled by the control means 40 to selectively supply the horizontal deflection control signal to the vertical deflection coil 102. Screen selection device according to the sense of viewing position of the television, characterized in that it comprises a vertical selection switch unit 118 to switch operation.

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