KR100216908B1 - Television having display position control function - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television having a display position control function of a caption character, and includes image playback processing means (16, 18, 20, 22) for reproducing a video signal for a broadcast signal of a channel tuned through a tuner (14). And a caption function for performing screen insertion processing for subtitle data transmitted by being included in the video signal through the video reproduction processing means (16, 18, 20, 22). A synchronous separator 24 for detecting the horizontal / vertical synchronous signal from the synchronous signal and supplying the horizontal / vertical synchronous signal to each device and a luminance level for detecting the luminance level of the video signal in a plurality of specific horizontal scan line regions. A subtitle position control signal for outputting the subtitle data to the horizontal scan line region having the lowest luminance level based on the luminance level detection signal applied from the luminance level recognition unit 26; A subtitle character for subtitle data included in the video signal based on a microcomputer 12 for outputting a subtitle and a subtitle position control signal applied from the microcomputer 12, and the on-screen display position of the subtitle character. It characterized in that it comprises a caption processing unit 30 for processing.

Description

Television with display position control of caption characters

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television having a display position control function of a caption character, and more particularly, to a television having a display position control function of a caption character that can change the display position of the caption character based on the luminance level of the CRT screen. It is about.

As is well known, a television employing a caption function detects only a video signal from a broadcast signal of a specific channel received through an antenna, and then detects caption data from the video signal and performs playback processing on the video signal. At the same time, after performing the caption processing operation on the caption data, the video signal and the caption signal are super-switched and synthesized by the superimposition method so that the user can simultaneously view the video signal and the caption text.

However, the caption characters output through the above-described television have a high luminance level (normally, the color of the caption characters output when performing the caption function is white) and the output position is fixed within a specific horizontal scan line range. If the luminance level of the video signal within the horizontal scan line range is high enough to correspond to the caption character, the difference of the luminance level between the caption character displayed on the horizontal scan line and the video signal does not occur so that the outline of the caption character is not revealed. do.

Therefore, in this case, it is difficult for the user to accurately recognize the caption characters output on the CRT screen.

Accordingly, the present invention has been made in view of the above circumstances, and it is possible to determine a luminance level within a specific horizontal scan line range at the top and bottom of a CRT screen, and to output subtitle characters in a horizontal scan line range having a low luminance level. It is an object of the present invention to provide a television having a display position control function of subtitle characters.

According to an embodiment of the present invention for realizing the above object, it is equipped with a video reproducing processing means for reproducing the video signal for the broadcast signal of the channel tuned through the tuner, the image reproducing processing means A television having a caption function for performing screen insertion processing for subtitle data transmitted by being included in a video signal, comprising: a synchronization for detecting a horizontal / vertical synchronization signal from the video signal and supplying the horizontal / vertical synchronization signal to each device; A luminance level detecting unit for detecting a luminance level of an image signal in a plurality of specific horizontal scanning line regions, and a horizontal scanning having the lowest luminance level based on a luminance level detecting signal applied from the luminance level detecting unit. A microcomputer for outputting a caption position control signal for outputting the caption data to a line area; A display position control function of a subtitle character configured to include a subtitle processor for generating subtitle characters for subtitle data included in the video signal based on an applied subtitle position control signal and processing a display position on the screen of the subtitle character. Television is provided.

According to the present invention having the above-described configuration, the caption characters can be easily recognized by displaying the caption characters in the horizontal scan line range in which the luminance level of the upper and lower ends of the CRT screen is relatively low.

1 is a block diagram of a television having a display position control function of a caption character according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

10: control signal input unit, 12: microcomputer,

14: tuner, 16: IF amplifier,

18: image detector, 20: image multiple processor,

22: image amplification unit, 24: synchronous separation unit,

26: luminance level recognition unit, 30: subtitle processing unit,

32: decoder, 36: control unit,

34: character portion, 38: output portion.

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

1 is a block diagram of a television having a display position control function of a caption character according to an embodiment of the present invention, in which reference numeral 10 generally includes a control panel installed at the front of the television. It is composed of a remote control for remote control of the television is a control signal input unit for setting the overall function of the television, 12 is a general operation of the television based on the control signal input from the control signal input unit 10, for example The microcomputer 12 controls the entire apparatus to perform a tuning operation of a specific channel or to adjust a volume level or a screen adjustment state. In the present invention, the microcomputer 12 is an area A applied from the luminance level recognition unit 26 to be described later. (35 to 135 horizontal scan lines) and the luminance level of the B area (425 to 525 horizontal scan lines) are compared to the A, The device is controlled in series so that the caption characters are displayed in the area B of low luminance level.

Also, reference numeral 14 is a tuner for tuning a specific channel among a plurality of broadcast channels received through an antenna based on the tuning voltage VT applied from the microcomputer 12, and 16 is tuned in the tuner 14. IF amplifier that amplifies the IF frequency of the broadcast signal.

Reference numerals 18, 20, and 22 denote video signal processing means for reproducing a video signal among video / audio signals for a specific channel tuned through the tuner 14, and reference numeral 18 denotes a surface acoustic wave filter (e.g., SAW filter) is an image detector for detecting only the picture intermediate frequency signal (PIF) from the IF signal amplified and output from the IF amplifier 16, 20 is the control of the microcomputer 12 The video signal output from the image detector 18 is output from the subtitle processor 30 to be described later, such as adjustment of an image related function designated by the control signal input unit 10, for example, luminance / contrast / color / sharpness. It is a video multi-processing unit which processes the caption signal and the video signal by superimposing and inserts the caption character on the screen and outputs the R / G / B / Y signal according to the superimposition method. A video amplifying section such that amplifies a video signal processor in a multi-processor 20 displays on the CRT device connected to the rear end.

In addition, reference numeral 24 in FIG. 1 denotes a synchronization separator for separating a horizontal synchronization signal and a vertical synchronization signal from an image signal output from the image detector 18 and supplying the horizontal / vertical synchronization signal to a device in series. And 26 are integral means for specific horizontal scan lines of the video signal output from the image detector 18, i.e., in the 35 to 135 horizontal scan lines (areas A) and 425 to 525 horizontal scan lines (areas B). A luminance level recognition unit for detecting a luminance level of a video signal.

Further, reference numeral 30 detects the caption data included in the video signal output from the image detector 18 based on the horizontal / vertical synchronization signal supplied from the synchronization separator 24, and then the micom 12 A caption processing unit for displaying caption characters for the caption data under the control of the ART or B region of the CRT screen, wherein the caption processing unit 30 is connected to the horizontal / vertical synchronization signal provided from the synchronization separating unit 24. A decoder unit 32 for detecting caption data included in the video signal output from the video detector 18, a character unit 34 storing character data corresponding to predetermined caption data, and the decoder. The character data corresponding to the subtitle data applied from the unit 32 is read by the character unit 34 to generate a subtitle character, and then the output position of the subtitle character under the control of the microcomputer 12. The subtitle character is outputted according to the control of the area A or the area B, and the subtitle data applied from the decoder 32 is compared with the subtitle data of one frame. 12) and an output unit 38 for converting the caption characters outputted from the control unit 36 into an analog signal and applying the same to the video multiplexer 20.

Hereinafter, the operation of the television with the display position control function of the caption character according to an embodiment of the present invention will be described in detail.

First, when a user inputs a channel signal for tuning a specific channel through which the caption broadcasting is provided through the control signal input unit 10, the microcomputer 10 selects the tuning voltage VT corresponding to the channel signal from the tuner. The tuner 14, which has received the tuning voltage VT, selects a channel corresponding to the tuning voltage VT among a plurality of channels received through the antenna.

Subsequently, in the broadcast signal of the channel tuned by the tuner 14, the intermediate frequency component is amplified by the IF amplifier 16, and then only the image signal is detected by the image detector 18 so that the image multiple processor ( 20 is applied to the synchronization separator 24, the decoder 32, and the luminance level recognition unit 26 at the same time.

Accordingly, the sync separator 24 separates the horizontal / vertical sync signal from the video signal and supplies the separated horizontal / vertical sync signal to a series of devices including the microcomputer 12 and the subtitle processor 30. The luminance level recognizer 26 detects the luminance level of a specific horizontal scan line of the video signal, that is, 35 to 135 horizontal scan line (area A) and 425 to 525 horizontal scan line (area B). A luminance level detection signal is applied to the microcomputer 12.

In this state, the microcomputer 12 compares the luminance levels of the region A and the region B based on the luminance level detection signal applied from the luminance level recognition unit 26 so that the luminance level of the region A is the luminance of the region B. Determine if it is higher than the level.

As a result of the determination, if the luminance level of the area A is higher than the luminance level of the area B, the microcomputer 12 applies a predetermined caption display position control signal to the control unit 36 so that the predetermined caption character is set to B on the CRT screen. If the luminance level of the area A is lower than the luminance level of the area B, the microcomputer 12 applies a predetermined caption display position control signal to the control unit 36 to display a predetermined caption character. Is displayed in the A area of the CRT screen.

On the other hand, the control unit 36 reads the character code data corresponding to the caption data detected by the decoder unit 32 from the character unit 34 to generate a predetermined caption character, and then applies it from the microcomputer 12. The display position of the caption character is processed based on the closed caption display position control signal, and the caption character is applied to the output unit 38. The output unit 38 converts the caption character into an analog signal and converts the image into an image. The multiprocessor 20 is applied.

Here, the image multi-processing unit 20 performs high-speed switching of the image signal output from the image detector 18 and the subtitle signal output from the output unit 38 in a superimposed manner and inserts it on the screen. In this case, since the caption signal is applied to the image multiple processor 20 so as to be inserted into the horizontal scan line region corresponding to the display position, the caption signal output from the image multiple processor 20 is 35 to 135 horizontal scan lines ( A region) or 425 to 525 horizontal scanning lines (region B).

In such a state, the control section 36 compares the caption data applied from the decoder section 32 by one frame of caption data, and if the caption data are the same, the caption characters composed of the caption data are not changed. The microcomputer 12 applies the same caption signal to the microcomputer 12 when the microcomputer 12 determines the state, and the microcomputer 12 receiving the caption identical signal stops outputting the caption position control signal to the controller 36. ) Controls the display position of the caption character based on the caption position control signal initially input.

Subsequently, if the caption data applied from the decore unit 32 is not the same as the caption data of one frame before, the control unit 36 applies the caption change signal to the microcomputer 12. The microcomputer 12 applies a predetermined caption position control signal to the control unit 36 based on the luminance level of the area A and the luminance level of the area B applied from the luminance level recognition unit 26, and thereby the CRT screen. The position of the caption character output to the image is controlled to be variable according to the surrounding luminance.

Therefore, in the case of the same caption character, the display position is output through the same display position as the initial display position, and if the caption character is changed, the display position of the caption character is variably according to the initial principal luminance at which the changed caption character is detected. Is changed.

As described above, according to the television having the display position control function of the caption characters according to the embodiment of the present invention, when the caption character is displayed on the CRT screen in the television with the caption function, the caption display position is set to the brightness of the screen. It is advantageous to be able to provide a clear caption character at all times as the caption character is displayed on the basis of the variable change on the basis of the region of low luminance level.

Claims (5)

Image reproducing processing means (16,18,20,22) for reproducing a video signal for a broadcast signal of a channel tuned through the tuner (14). In the television with a caption function to perform the screen insertion process for the caption data transmitted by being included in the video signal through 22), A synchronization separator 24 which detects a horizontal / vertical synchronization signal from the video signal and supplies the horizontal / vertical synchronization signal to each device; A luminance level recognition unit 26 for detecting a luminance level of an image signal in a plurality of specific horizontal scan line regions; A microcomputer 12 for outputting a caption position control signal for outputting the caption data to the horizontal scan line region having the lowest brightness level based on the brightness level detection signal applied from the brightness level recognition unit 26; And a caption processing unit 30 for generating caption characters for caption data included in the video signal based on the caption position control signal applied from the microcomputer 12 and processing the display position of the caption characters on the screen. Television with a display position control function of the caption character, characterized in that configured to. The method of claim 1, wherein the caption processing unit (30) includes: a decoder unit (32) for detecting caption data included in the video signal, a character unit (34) storing character code data corresponding to each caption data; The character code data corresponding to the caption data applied from the decoder unit 32 is read from the character unit 34 to generate caption characters, and based on the caption position control signal applied from the microcomputer 12. The control unit 36 for processing the display position for the caption character, and converts the caption character processed and output by the control unit 36 into an analog signal to be applied to the image reproduction processing means (16, 18, 20, 22). A television having a display position control function of a caption character, characterized in that consisting of an output unit (38). The method of claim 2, wherein the control unit 36 compares the subtitle data applied from the decoder unit 32 with the subtitle data one frame before and applies the same subtitle signal to the microcomputer 12 when both subtitle data are the same. On the other hand, a television with a display position control function of a caption character, characterized in that if the two caption data are not the same, a caption change signal is applied to the microcomputer 12. The subtitle of claim 1, wherein the microcomputer 12 outputs the same caption character to the controller 36 when the same caption signal is applied from the controller 36 to output the same caption character to the same display area. The caption character display position control function of the caption character is characterized in that when the caption change signal is applied from the control unit 36 after the application operation for the position control signal is stopped. television. The display position control function of a caption character according to claim 1, wherein the plurality of specific horizontal scan line areas are first horizontal scan line areas (35 to 135 lines) and second horizontal scan lines (425 to 525 lines). Equipped with television.