KR0150538B1 - Sub-screen form changing apparatus - Google Patents

Abstract

The present invention is to provide a sub-screen shape converting apparatus that can maximize the viewing efficiency of the viewer by changing the shape of the sub-screen displayed on the CRT by varying the blanking signal for the sub-screen.

To this end, the present invention, the mode setting key 20 for setting the shape conversion of the sub-screen; A microcomputer 22 for controlling the shape conversion operation of the sub-screen according to whether the mode is set by the mode setting key 20; A clock generator 24 for generating a predetermined clock signal; Blanking pulse for variably generating a new sub-screen blanking signal based on the clock signal, the horizontal / vertical synchronization signal for the main screen, and the blanking signal for the rectangular sub-screen from the clock generator 24 under the control of the microcomputer 22. Variable width portion 26; A switching unit (28) for switching and outputting any one of the blanking signal for the rectangular sub-screen and the variable blanking signal from the blanking pulse width variable section (26) under the control of the microcomputer (22); The main / sub picture switching unit 10 is configured to apply a sub picture R.G.B signal to the blanking signal from the switching unit 28 and display the same on the CRT.

Description

Sub-screen shape inverter

1 is a block diagram illustrating a problem of a television having a conventional sub picture function.

2 is a block diagram of a sub-picture shape converting apparatus according to an embodiment of the present invention.

3 is a view showing an example of a remote controller employing the mode setting key shown in FIG.

4A to 4G show an example of a pulse waveform output from the pulse width variable portion under the control of the microcomputer shown in FIG.

FIG. 5 is a flowchart for explaining the control processing procedure and control contents of the microcomputer shown in FIG.

6 is a diagram illustrating an example of a sub-screen displayed on the CRT in the sub-screen shape conversion mode according to the present invention.

Explanation of symbols on the main parts of the drawings

1: AV switching unit 2, 3: ADC

4, 5: Memory 6: Main / Subscreen Generation

7, 8: DAC 9: Main / Subscreen Output

10: Main / sub screen switching unit 20: Mode setting key.

22: microcomputer 24: clock generator

26: blanking pulse width variable portion 28: switching unit

The present invention relates to a sub-screen shape converting apparatus, and more particularly, to a sub-screen shape converting apparatus configured to change a sub-screen shape by varying a blanking signal for a sub-screen in a television having a sub-screen function.

Nowadays, as the trend of high-end television is accelerating, PIP (Picture In Picture) allows large TV or wide television to be inserted on the main screen (sub picture), which is reproduced on a single CRT device. According to such a PIP function, a multi-channel TV broadcasting signal is tuned through one or more built-in tuners in the television, and the broadcasting signal of each channel is separately processed. Video output is available on the screen and sub-screen.

As described above, a TV capable of outputting a main screen or a sub screen outputs control signals such as a 2 screen (ie, a main screen and a sub screen) mode on / off signal, a 2 screen switching signal, and a screen shift signal from a microcomputer to an integrated device dedicated to 2 screen control. It is supplied so that a plurality of (eg, about two) video screens received from the antenna can be simultaneously viewed. Here, according to the two screen switching signal, the first video screen is a large screen, the second video screen is processed as a small screen, or vice versa. FIG. 1 is a schematic block diagram of a wide television corresponding to an example of a television capable of display operation with a conventional sub-screen function, the wide television being received from an antenna and having tuner means (e.g., first and second tuners; AV signal switching unit 1 which receives intermediate frequency signals from a plurality of broadcast signals and extracts the video / audio paths for the main and sub-screens and outputs them as signal processing paths for each screen, and the AV An analog / digital conversion section (2; 3) as a signal conversion means for converting the main screen video signal and the sub-screen video signal output from the signal switching section (1) into digital values, respectively, and the analog / digital conversion section (2). 3) a main line and a sub-screen video signal outputted from the analog / digital converters 2 and 3 respectively correspondingly connected to the scan line and the field under the control of a memory controller (not shown); A digital signal processor (e.g., a digital signal processor) for receiving a main / sub picture signal from the memory (4; 5) and a memory (4; 5) consisting of a line memory and a field memory to be stored and output, respectively, and processing the digital signals. A main / sub picture generation section (6) consisting of a DSP) and a main output from the main / sub picture generation section (6). A note output from the digital / analog converting section (7; 8) and the digital / analog converting section (7; 8) as a signal converting means for converting a digital signal for a sub picture into an original analog signal. The main / sub picture output unit 9 which converts the sub picture signal into a RGG signal which is a display signal, respectively, and outputs it on the CRT, and the main / sub picture output unit according to the switching signal of the microcomputer (not shown) ( And a main / sub picture switching unit 10 for selectively switching and outputting the main / sub picture from 9) to the corresponding display position. Here, the main / sub screen switching unit 10 may be provided at the front end of the main / sub screen output unit 9.

According to the wide television configured as described above, the intermediate frequency signals for the plurality of broadcast signals (i.e., the main picture broadcast signal and the sub picture broadcast signal) that are tuned and input by the tuner means are applied to the AV signal switching unit 1, The AV signal switching unit 1 selects the video / audio signals for the main and sub-screens by switching and outputs them to the analog / digital conversion units 2 and 3 at the rear stage.

Accordingly, the analog / digital conversion section 2 performs digital conversion on, for example, the main picture video signal, and the digital conversion signal is stored in the memory 4 by a recording signal of a memory controller (not shown). Is applied to the main / sub picture generator 6 by the read signal of the memory controller, and the new signal is stored in the memory 4 until another new signal is input.

Then, the analog / digital conversion unit 3 performs digital conversion on the sub-screen video signal, for example, and the digitally converted signal is stored in the memory 5 by the recording signal of the memory controller, and then a new scan is performed. When signal conversion is performed on the line and field, the signal is stored in the memory 5, and when signal conversion is performed on the new scan line and field, the previous signal stored in the memory 5 is stored in the read signal of the memory controller. Is applied to the main / sub picture generating section 6, and the new signal is stored in the memory 5 until another new signal is input.

Thus note above. The sub picture generator 6 performs arithmetic processing such as filter or Fourier transform on the signals output from the memories 4 and 5 according to the read signal of the memory controller (not shown). After extracting the information necessary for the main / sub picture signal without any deterioration of image quality, it is sequentially applied to the digital / analog converters 7 and 8, and the digital / analog converters 7 and 8 perform the main / sub picture. The digital signal from the unit 6 is converted into an analog signal capable of processing image signals and applied to the main / sub picture output unit 9, and the main / sub picture output unit 9 converts the main / sub picture converted into analog. The color image signal is converted into an RGB signal which is a display signal. As a result, the main and sub picture signals are output to the predetermined position on the CRT with the main and sub picture switching unit 10 as a whole.

In such a PIP function, a sub-screen blanking signal is loaded onto the main screen blanking signal. When the sub-screen blanking signal is detected, the sub-screen having a rectangular shape is displayed at the position.

However, in the conventional television, since the blanking signal for the sub picture is loaded with a constant duty ratio with time, it does not escape from the rectangular shape. For that reason, the shape of the sub-screen is so monotonous that it does not maximize the viewer's viewing efficiency.

Accordingly, the present invention has been made in view of the above circumstances, and an object thereof is to change a sub-screen shape so as to maximize a viewer's viewing efficiency by changing the shape of a sub-screen displayed on a CRT by varying a blanking signal for a sub-screen. In providing a device.

In order to achieve the above object, the sub-screen shape converting apparatus according to the present invention comprises: a mode setting key for setting the shape of the sub-screen; A microcomputer that controls the shape conversion operation of the sub-screen according to whether the mode is set by the mode setting key; A clock generator for generating a predetermined clock signal; A blanking pulse width variable section for variably generating a new sub-screen blanking signal based on the clock signal from the clock generator, the horizontal / vertical synchronous signal for the main screen, and the blanking signal for the rectangular sub-screen under the control of the microcomputer; A leveling unit for switching and outputting any one of the blanking signal for the rectangular sub-screen and the variable blanking signal from the blanking perk width variable part under the control of the microcomputer; It consists of a main / sub picture switching unit which adds a sub picture R.G.B signal to the blanking signal from the switching unit and displays it on the CRT.

According to a preferred embodiment of the present invention, in the sub-picture conversion mode, the microcomputer is output to the predetermined reference line on the sub-screen based on the clock signal from the clock generator, while the pulse width is sequentially widened by a predetermined width. And controlling the blanking pulse width variable part to generate a signal, and after the reference line, the blanking pulse variable part to generate a blanking signal that is output while the pulse width is sequentially narrowed by a predetermined width based on the clock signal from the clock generator. To control.

The reference line on the sub-screen is 1/2 of the total number of lines.

Also note above. The sub-screen displayed on the CRT through the sub-screen switching unit forms a circle.

According to the present invention configured as described above, when the sub picture shape conversion mode is set by the mode setting key, the blanking pulse width variable part generates the circular sub picture blanking signal under the control of the microcomputer, and the circular sub picture for the sub picture. The blanking signal is displayed on the CRT by being combined with the sub picture RGB signal at the main / sub picture switching unit via the switching unit.

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

2 is a block diagram of a sub-screen shape converting apparatus according to an embodiment of the present invention. The apparatus of the present invention includes a main / sub-screen switching unit 10, a mode setting key 20, a microcomputer 22, and a clock. The generator 24, the blanking pulse width variable section 26, and the switching section 28 refer to the same components as those described in FIG. 1 (main / sub picture switching section 10). Are given the same and description thereof is omitted.

The mode setting key 20 is provided on the front control panel or remote control means (remote control; see FIG. 3) of the television, and the sub-screen maintenance conversion for converting the shape of the rectangular sub-screen into a circular sub-screen, for example. Key for mode setting.

The microcomputer 22 controls the operation state of the television according to a key input signal from the front control panel of the television or a signal applied from a remote control means, and on the CRT in the sub picture shape conversion mode assumed in the present invention. The shape of the normal rectangular sub-screen displayed is controlled to be displayed, for example, converted into a circular sub-screen.

The clock generator 24 generates a clock signal CLK having a predetermined pulse width.

The blanking pulse width variable part 26 includes a vertical synchronization signal for main screen (hereinafter referred to as MVS) and a horizontal synchronization signal for main screen (hereinafter referred to as MHS), a blanking signal for subscreens, and the clock generator (2) An integrated circuit (model name: EPM 5016 EPLD IC) configured to receive a predetermined clock signal CLK from the controller and output a predetermined monostable pulse (model name: EPM 5016 EPLD IC). Under the control of the control panel), the pulse widths of the blanking signals on the upper line side and the lower line side are sequentially variable by a predetermined width in a state in which a predetermined line (i.e., a half of the total number of lines) is set as a reference line. The pulse widths of the blanking signals are symmetrical when the upper line and the lower line are compared with each other (see FIG. 4).

The switching unit 28 receives one of the two signals under the control of the microcomputer 22 while receiving the blanking signal for the rectangular sub-screen and the blanking signal output from the blanking pulse width variable section 26, respectively. The sub screen switching unit 10 is transmitted.

Next, the operation of the sub-screen shape converting apparatus according to the present invention configured as described above will be described based on the flowchart of FIG.

Once the television capable of the PIP function is turned on, the microcomputer 22 determines whether the sub picture shape conversion mode is set by the mode setting key 20 installed on the remote controller (see FIG. 3). (Step 50)

As a result of the determination, when the sub-screen shape conversion mode is not set, the microcomputer 22 controls the switching unit 28 to form a normal blanking signal for sub-screens to form a rectangular shape. To be applied). As a result, a general rectangular sub-screen is displayed on the CRT via the main / sub-screen switching unit 10 (step 52).

However, when the sub-screen shape conversion mode is set as a result of the determination in step 50, the microcomputer 22 causes the switching unit 28 to operate the blanking pulse width variable part 26 while the blanking pulse width variable part ( 26). Accordingly, the blanking pulse width variable part 26 is used for the sub picture carried on the horizontal synchronous signal MHS and the vertical synchronous signal MVS and the main screen blanking signal from the main screen synchronous separation circuit (not shown). The blanking signal is input and at the same time a predetermined clock signal is received from the clock generator 24. Then, the blanking pulse width varying section 26 under the control of the microcomputer 22 on the basis of such a signal in the upper line and the lower line on the basis of the line corresponding to the middle line in the total number of sub-screens as a reference line. The new sub-picture blanking signal (refer to FIG. 4) with the variable pulse width can be sequentially generated and outputted so that the pulse widths of the pulse widths can be mutually symmetric (step 54).

In other words, the blanking pulse width variable section 26 counts the MVS to determine the initial generation position of the sub-screen (eg, the position of the first scanning line of the sub-screen), and the generation position of the sub-screen is determined. When the first MHS is triggered with the blanking signal for the sub picture, the clock signal from the clock generator 24 starts to be counted. Subsequently, when the count value of the clock signal reaches a predetermined value, a blanking signal is output on the sub-screen having the pulse width? As shown in FIG. At the position where the clock value preceding the predetermined value is counted at the count value (that is, the count value at the first MHS input), the blanking signal for the sub-screen having the pulse width α as shown in FIG. When the third MHS is inputted, a negative part having a pulse width? As shown in Fig. 4 (c) at the position where the clock value preceding the predetermined value is counted in the previous count value (that is, the count value at the second MHS input). The blanking signal for the screen is output.

In this way, when the reference line position (that is, the line position which is 1/2 of the total number of lines) is reached, the blanking pulse width variable part 26 operates similarly to the above-described operation, so that the pulse width? The blanking signal for the screen is output [see Fig. 4 (d)].

Then, the blanking pulse width variable section 26 outputs a blanking signal for sub-screens in which the pulse width α is gradually narrowed symmetrically with the above-described operation. [See FIGS. 4 (e) to 4 (g)].

As such, the variable sub-screen blanking signal output from the blanking pulse width variable part 26 is applied to the main / sub picture switching unit 10 via the switching unit 28, and the main / sub picture Since the switching unit 10 applies the RGB signal of the sub picture to the circular sub picture blanking signal, it is outputted (step 56). Finally, the sub-screen displayed on the CRT takes the shape of a circle as shown in FIG. 6 rather than a general rectangular shape (step 58).

According to the present invention as described above, as the sub-screen shape conversion mode is set, the sub-screen displayed on the CRT takes a circular shape, thereby maximizing the viewer's viewing efficiency as well as improving the product quality. Will be.

In addition, this invention is not limited only to the above-mentioned embodiment, It can implement by modifying and modifying within the range which does not deviate from the summary of this invention. For example, in the above-described embodiment, the sub-screen is displayed in a circular shape, but if the blanking pulse width variable part is properly controlled, it may be displayed in a triangular shape, a rhombus shape, or a trapezoid shape.

Claims (4)

A mode setting key 20 for setting the shape change of the sub-screen; and a microcomputer 22 for controlling the shape change operation of the sub-screen according to whether the mode is set by the mode setting key 20; A clock generator 24 for generating a predetermined clock signal; under the control of the microcomputer 22, a clock signal from the clock generator 24, a horizontal / vertical synchronization signal for the main screen, and a blanking signal for the rectangular sub-screen; A blanking pulse width variable portion 26 which variably generates a new blanking signal for sub-screens based on the variable; a variable from the blanking signal width variable portion 26 and the rectangular sub-screen blanking signal under the control of the microcomputer 22; A level switching unit 28 for switching and outputting any one of the blanking signals; and a main / sub picture switching unit 10 for displaying a sub-screen RGB signal on the CRT by adding a sub-screen RGB signal to the blanking signal from the switching unit 28. Sub-screen shape converter, characterized in that configured. The blanking device of claim 1, wherein the microcomputer 22 outputs a clock signal from the clock generator 24 to the predetermined reference line on the sub-screen in the sub-screen shape conversion mode, while the basic pulse puck is sequentially widened by a predetermined width. The blanking pulse width variable part 26 is controlled to generate a signal, and after the reference line, the blanking signal is outputted while the pulse width is sequentially narrowed by a predetermined width based on the clock signal from the clock generator 24. And controlling the blanking pulse variable part (26) to generate. The sub-screen shape converting apparatus of claim 2, wherein the reference line on the sub-screen is 1/2 line of the total number of lines. The sub-screen shape converting apparatus according to claim 1, wherein the sub-screen displayed on the CRT through the main / sub-screen switching unit (10) forms a circle.