KR19980043397A - Aspect ratio automatic conversion display apparatus and method of television receiver - Google Patents

Abstract

The present invention relates to a display apparatus and a method for automatically converting an aspect ratio of a television receiver. In the related art, a dedicated system is required to implement auto wide, and in order to implement a detected aspect ratio, the deflection is ultimately controlled so as to cause a deflection like a projection TV. There is a problem that can not be applied to a device that can not be handled at will, such as general CTV. Therefore, the present invention includes a clock generator 10 for generating a main clock for digital processing; A timing generator 10 which receives a horizontal / vertical synchronization signal and a timing control signal and generates a timing signal for controlling each of the necessary parts; A synchronizing separator 30 for separating the horizontal synchronizing signal H and the vertical synchronizing signal V from the luminance signal Y; A luminance signal analog / digital converter 50 for converting the luminance video signal into a digital video signal and storing the same in the first field memory 60; A multiplexer 70 which receives an input color difference signal R-Y (B-Y) and multiplexes it according to a control signal to generate and output a composite color signal; A color signal analog / digital conversion unit (80) for converting the composite color signal generated by the multiplexer (70) into digital data and storing it in the second field memory (90); Receiving a digital video signal from the second field memory (90), and comparing the image level comparison value to determine whether there is a video signal and outputs a timing control signal and a vertical interpolation control signal for horizontal image processing and vertical image processing. An aspect ratio detection and aspect ratio control unit 40; According to the aspect ratio detection and the vertical interpolation control signal of the aspect ratio control unit 40, the digital data of the luminance signal and the composite color signal are read from the first field memory 60 and the second field memory 90 and vertically interpolated and output. A vertical interpolation unit 100; A digital / analog converter 110 for converting and outputting digital data of the image vertical interpolator 100 into an analog luminance signal and a color difference signal; The deflection controller 120 controls the deflection of the CIT 130 according to the luminance signal and the color difference signal input from the digital / analog converter 110 to display the image using the image signals R, G, and B. To automatically switch the aspect ratio for display.

Description

Aspect ratio automatic conversion display apparatus and method of television receiver

The present invention relates to an apparatus and method for automatically converting aspect ratio of a television receiver, and more particularly to an apparatus and method for automatically converting an aspect ratio of a television receiver for automatically detecting an aspect ratio of a television and automatically converting an aspect ratio using the detected result. .

A conventional aspect ratio display apparatus of a television receiver includes a sync separator 1 for separating a sync signal from a luminance signal Y separately detected from an input video signal; A pedestal clamp pulse generator (2) for generating a pedestal clamp pulse upon input of a sync signal separated by the sync separator (1); A luminance signal input by using the pedestal clamp pulse from the pedestal clamp generator 2 is clamped, compared with a reference signal, and based on the comparison result, a luminance for outputting a presence / absence determination signal of a video signal. A signal clamp and comparison section 3; A latch unit 4 for latching a presence / absence determination signal of the video signal; A wide dedicated microcomputer (5) for detecting aspect ratio data for an image using a signal latched to the latch unit (4) and a vertical synchronization signal input from the outside, and outputting the detected aspect ratio data; The main microcomputer 6 controls the deflection control unit 7 to the aspect ratio of the mode determined by the aspect ratio data inputted from the wide dedicated microcomputer 5.

Looking at the prior art configured in this way in detail as follows.

When the sync separator 1 separates and outputs a sync signal from the luminance signal Y detected from the input image signal, the pedestal clamp pulse generator 2 uses the separated sync signal to output a pulse for the pedestal clamp. Occurs by creating a.

The pedestal clamp pulse generated in this way is input to the luminance signal clamp and comparator 3. Accordingly, the luminance signal clamp and comparator 3 clamps the luminance signal input using the pedestal clamp pulse, and then compares it with the reference signal and outputs a high value if the image signal is larger than the reference signal, that is, if an image signal exists. In other words, if there is no video signal, a row is output, and the output signal is latched to the latch unit 4.

Then, the wide dedicated microcomputer 5 detects the aspect ratio data for the image using the signal latched to the latch unit 4 and the vertical synchronization signal input.

The detected aspect ratio data is inputted from the main microcomputer 6 to control the deflection control unit 7 to adjust the aspect ratio to the aspect ratio of the mode determined by the aspect ratio data.

However, the prior art as described above requires a dedicated system as shown in FIG. 1 to implement auto-wide, and ultimately controls deflection to implement the detected aspect ratio, so that deflection is similar to that of a normal TV. There is a problem that can not be applied to devices that can not be handled at will.

Accordingly, an object of the present invention to solve the conventional problems is to provide an apparatus and method for automatically converting an aspect ratio of a television receiver to enable a display suitable for each image source using a vertical interpolation horizontal expansion or the like. .

1 is a block diagram of a widescreen display device of a conventional television receiver.

2 is a block diagram of an aspect ratio automatic conversion display device of the television receiver according to the present invention;

3 is a detailed block diagram of the aspect ratio detection and control unit in FIG. 2;

4 is an operation process diagram for the aspect ratio automatic conversion display method of the television receiver of the present invention;

Explanation of symbols on the main parts of the drawings

10: clock generator 20: timing generator

30: synchronization separator 40: aspect ratio detection and aspect ratio control

50: analog / digital converter for luminance signal

70: multiplexer 100: image vertical interpolator

110: digital / analog converter

120: deflection control unit 130: Citi

According to one aspect of the present invention, there is provided a method for automatically converting an aspect ratio of a terrell vision receiver, comprising: a first step of comparing a digital image signal and an image level comparison value input when there is a horizontal / vertical synchronization; A second step of determining that there is a video signal when the digital video signal is larger than the video level comparison value in the first step and determining that there is no video signal; A third step of increasing the value of the horizontal synchronous counter by counting from the vertical synchronization start point to the rising point of the video signal in the second step to determine whether it is a real image or a subtitle; If there is no video signal in the second step, counting between the caption start points at the end of the video signal to determine whether it is between the video parts or between the video parts and the captions, and then increasing the value of the horizontal synchronization counter by one; In a third step and a fourth step, a sixth step of outputting a mode detection signal for controlling the aspect ratio by comparing the value of the horizontal synchronization counter and the scanning player.

The aspect ratio automatic conversion display apparatus configuration of the television receiver for performing the method comprising the above steps includes: a clock generator 10 for generating a main clock for digital processing, as shown in FIG. A timing generator 20 which receives a horizontal / vertical synchronization signal and a timing control signal and generates a timing signal for controlling each required part; A synchronizing separator 30 for separating the horizontal synchronizing signal H and the vertical synchronizing signal V from the luminance signal Y; A luminance signal analog / digital converter 50 for converting the luminance video signal into a digital video signal and storing the same in the first field memory 60; A multiplexer 70 which receives an input color difference signal R-Y (B-Y) and multiplexes according to a control signal to generate and output a composite color signal; A color signal analog / digital conversion unit (80) for converting the composite color signal generated by the multiplexer (70) into digital data and storing it in the second field memory (90); Receiving the digital luminance signal from the first field memory 60, and comparing the image level comparison value to determine whether there is an image signal, and outputs a timing control signal and a vertical interpolation control signal for horizontal image processing and vertical image processing. An aspect ratio detection and aspect ratio control unit 40; According to the aspect ratio detection and the vertical interpolation control signal of the aspect ratio control unit 40, digital data about luminance signals and composite color signals are read from the first field memory 60 and the second field memory 90 and vertically interpolated and output. An image vertical interpolator 100; A digital / analog converter 110 for converting and outputting digital data of the image vertical interpolator 100 into an analog luminance signal and a color difference signal; The deflection controller 120 controls the deflection of the CIT 130 according to the luminance signal and the color difference signal input from the digital / analog converter 110 to display the image using the image signals R, G, and B. do.

The aspect ratio detection and aspect ratio control unit 40, as shown in Figure 3, the image signal presence determination unit for detecting the presence of the image signal by comparing the image level comparison value input from the digital image signal input from the microcomputer (41); The first and second start positions are counted by using the image presence detection signal of the video signal determination unit 41, the vertical synchronization signal V, and the horizontal synchronization signal H, and the first and second end positions are counted. The control unit 42 counts the counters 43-46 for counting, determines the input image source based on the counted value, and outputs a timing control signal and a vertical interpolation control signal.

Referring to the operation and effect of the present invention configured as described in detail as follows.

The clock generator 10 outputs a main clock for digital processing to the timing generator 20. At this time, the synchronization separator 30 receives the input luminance signal Y and separates the horizontal synchronization signal H and the vertical synchronization signal V to the timing generator 20, the aspect ratio detection and the aspect ratio controller 40, respectively. Output

The timing generator 20 then supplies the main clock of the clock generator 10, the horizontal / vertical synchronization signal (H / V) of the synchronization separator 30, and the timing control signal of the aspect ratio detection and aspect ratio controller 40. Each control unit generates various control signals required, that is, clock frequency and enable signal. The timing control signal generated by the screen detection and aspect ratio control unit 40 will be described later.

The luminance signal analog / digital converter 50 converts the input analog luminance signal into a digital image signal in accordance with the timing signal of the timing generator 20 to write the digital image signal to the first field memory 60. The color difference signal RY (BY) input to the multiplexer 70 is multiplexed into a composite color signal and output to the analog / digital converter 80 for color signals to convert the analog composite color signal into digital data. )). Herein, the multiplexer 70 multiplexes the color difference signals R-Y (B-Y) at two-division clock frequencies of analog / digital sampling frequencies.

Image data inputted after reading the data written in the first field memory 60 from the aspect ratio detection and aspect ratio control unit 40 and comparing the image level comparison values sent from a microcomputer (not shown). When is determined, the timing control signal is sent to the timing generator 20 for the horizontal image processing, and the vertical interpolation control signal is sent to the image vertical interpolator 100 for the vertical image processing.

Accordingly, the image vertical interpolator 100 generates timing signals of the image signals read from the first field memory 60 and the second field memory 90 according to the aspect ratio detection and the vertical interpolation control signals output from the aspect ratio controller 40. The aspect ratio is controlled by vertical interpolation in accordance with the timing signal of the unit 20 and is output to the digital / analog converter 110.

Accordingly, the digital / analog converter 110 converts the digital video signal with vertical interpolation to control the aspect ratio into an analog video signal and converts the converted video signal Y (RY) (BY) into the deflection control unit 120. It outputs to control the deflection of the Citi 130 to display the video signals R, G, B.

As a result, the aspect ratio is automatically displayed on the adjusted screen.

Here, the aspect ratio detection and the aspect ratio control unit 40 will be described with reference to FIG. 4 as follows.

The aspect ratio detection and aspect ratio determination unit 41 of the aspect ratio control unit 40 compares the digital image signal of the luminance signal read out from the first field memory 60 with the image level comparison value provided from the microcomputer.

As a result of the comparison, if the digital video signal is larger than the video level comparison value, it is determined that there is a video signal, and if it is not small, the video signal is sent to the controller 42.

In the above, both the video signal presence determination unit 41 and the control unit 42 operate every clock frequency period.

The control unit 42, which has received the image presence detection signal, receives the horizontal synchronization signal H and the vertical synchronization signal V from the synchronization separator 30 to count the first to fourth counters 43-46. Then, the input image source is determined based on the counted value, and the timing control signal and the vertical interpolation control signal are output.

The first counter 43 detects from the start point of the vertical synchronization signal V to the time Start1 at the first rising edge of the image presence detection signal synchronized with the vertical synchronization signal V in FIG. 5. The first counter 44 is a counter for detecting the time between the end of the image (End1) in the first rising section of the image presence detection signal, the third counter 45 is the end of the image (End1) The counter detects until the subtitle start time Start2, and the fourth counter 46 detects the subtitle start time Start2 from the subtitle start time Start2 to the end time of the subtitle.

The aspect ratio detection and aspect ratio control described so far will be described once again with reference to FIG. 6.

When the image source detection routine is started, the vertical synchronization signal V is first detected, and if there is a vertical synchronization signal V, it is detected whether the horizontal synchronization signal H is input.

As a result of the detection, if there is a vertical synchronization signal (V) and a horizontal synchronization signal (H), it is determined whether the digital image data inputted and the image level comparison value from the microcomputer and the comparison term image exist. If it is large, it is determined that there is an image, and if the image data is smaller than the image level comparison value, it is determined that there is no image.

Here, the image is 100 IRE on the basis of the pedestal level, but if 25 IRE is set as the image level comparison value based on the pedestal level, it is determined that there is no image if the input video signal is 25 IRE or less.

If it is determined that there is an image, it is determined whether the determined image portion is an actual image or a caption image. If the value counted by the third counter 45 is 0, the first counter determines the actual image portion and counts the image portion. If the value counted by the third counter 45 is not 0, it is determined as the subtitle part, and 1 is added to the count value of the fourth counter 46 which counts the subtitle part. .

If it is determined that there is no video, the second counter 44 counts whether it is determined whether the determined part is between the vertical sync and the video part, that is, between the Start1 section and between the video part and the subtitle part, that is, the Start2 section. If the value is 0, 1 is added to the value of counting the Start1 section, and if the count value is not 0, 1 is added to the count of the Start2 section.

After all of the above operations, 1 is added to the count value of the horizontal sync counter to count the horizontal sync, and the value of the horizontal sync count is compared with the 256 scanning athletes.

As a result of the comparison, if it is less than 256, the operation is newly started from the beginning, and if it is more than 256, the count value of the fourth counter 46 which counts the subtitle part is checked. If not, the count value of the first counter 43 is determined. If the count is greater than or equal to 66 shot athletes and less than or equal to 75 shot athletes, the controller 42 sends the Cinema 2 mode detection signal to the TV microcomputer.

If the count value of the fourth counter 46 is 0, there is no subtitle. If the count value of the first counter 43 is greater than or equal to 10 and less than or equal to 25, the video source is 4: 3. Outputs the mode detection signal in wide, checks whether the first counter 43 is in the range as shown in FIG. 6 if it does not fall within the above range, and outputs the mode detection signal to Vista 1, Vista 2, Cinema 1, etc., respectively. do.

If the image source is Vista 2, the number of video lines is 162 and the center line is 144H.

In addition, when the image source is detected by Vista 2, the second field memory 90 is set to have an analog / digital sampling frequency and the memory write clock frequency f _W is 18.1237 MHz, and the digital / analog clock frequency is set to realize a horizontal magnification of 1.125 times. And a horizontal signal processing with the memory lead clock frequency f _R as 16.11 MHz, and a vertical magnification of 1.5 times is transmitted from the control unit 42 to the Vista micro 2 when the mode detection signal is sent to the TV micro computer. The deflection control unit 120 is controlled to enlarge the vertical direction of the image 1.5 times with respect to the middle and third lines 144H.

As described above, the present invention can vary the image level comparison value in the microcomputer, there is an effect that the TV user to significantly reduce the image signal presence determination error by varying the image level comparison value, such as R / C.

Claims (3)

A first step of determining whether there is an image by comparing the input image data with an image level comparison value; A second step of determining whether the image is an actual image or a subtitle when it is determined that the image exists; A third step of determining whether the part is between the vertical sync and the video part and between the video part and the subtitle part when it is determined that there is no image in the second step; And a fourth step of detecting a horizontal synchronous counter value and outputting a mode detection signal for controlling an aspect ratio according to the determination in the second and third steps. A television receiver for selecting a broadcast signal as an input signal and displaying a wide screen, the television receiver comprising: a multiplexer for receiving an input color difference signal (R-Y) (B-Y) and multiplexing according to a control signal to generate a composite color signal; An analog / digital converter for color signals converting the synthesized color signals generated by the multiplexer into digital data and storing them in a second field memory; An analog / digital converting unit for the luminance signal which receives the input luminance signal Y and converts the digital signal into digital data and stores it in the first field memory; Receives a digital luminance signal from the first field memory and compares it with an image level comparison value to determine whether there is an image signal, and then detects an aspect ratio and outputs an aspect ratio control signal and a vertical interpolation control signal for horizontal image processing and vertical image processing A controller; According to the aspect ratio detection and the vertical interpolation control signal of the aspect ratio control unit, the digital / analog converter and the deflection control unit read the digital data of the luminance signal stored in the first field memory and the composite color signal stored in the second field memory and vertically interpolate the image. An apparatus for automatically converting an aspect ratio of a television receiver, characterized in that it comprises a vertical interpolator for outputting a video signal by controlling the deflection. The display apparatus of claim 2, wherein the aspect ratio detection and aspect ratio control unit comprises: an image signal presence determining unit configured to detect the presence or absence of an image signal by comparing a digital image signal input with an image level comparison value input from a microcomputer; A counter for counting first and second start positions and counting first and second end positions using the image presence detection signal, the vertical synchronization signal (V), and the horizontal synchronization signal (H). And a control unit for counting and determining a video source inputted with the counted value and outputting a timing control signal and a vertical interpolation control signal.