JP3168145B2 - Screen mode switching method for landscape TV receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen for controlling switching of screen modes according to each aspect ratio when receiving a television signal containing image screens having different aspect ratios in a landscape television receiver. It relates to a mode switching method.

[0002]

2. Description of the Related Art In recent years, wide-screen television receivers have become widespread. In this wide screen landscape television receiver, when the upper and lower sides of the screen are masked by black signals and a so-called letterbox broadcast television signal having a 16: 9 image therein is received, a subtitle in mode or a subtitle in mode is operated by the user side. The upper and lower masked portions of the screen, such as a wide zoom mode, are excluded from the screen and enlarged to 16: 9.
Project the image part on the entire disc play screen of
It can be viewed as a 6: 9 image. When the auto-wide function is selected, the image portion can be automatically enlarged and displayed on the entire 16: 9 screen without operation by the user. The above-mentioned subtitle in mode means that the subtitle in the lower black image of the received letterbox broadcast television image is left, the upper black image portion is excluded, and the 16: 9 image in the middle is enlarged. Mode. The wide zoom mode is a mode in which the upper and lower black image portions are excluded, and the 16: 9 image inside is enlarged. Also, not letterbox broadcasting 4:
For example, there is a wide mode in which the right and left are enlarged to a 16: 9 screen in the case of a 3 normal television signal.

FIG. 3 is a flowchart showing the operation of a screen mode switching process of a conventional screen mode switching device for realizing such an auto wide function. According to this flowchart, it is first checked whether or not the television signal is a letterbox broadcast (step S1). If it is not letterbox broadcasting, it is an ordinary 4: 3 television signal, and the mode is the wide mode (step S2). In the case of letter box broadcasting, it is checked whether or not there is subtitles (step S
3). If a subtitle is included in the black signal below the television signal image, the subtitle in mode is set (step S4). When the subtitle-in mode is set and the television signal image has no subtitle for a predetermined time (step S
5) After the lapse of the predetermined time, the screen mode is automatically switched from the subtitle in mode to the wide zoom mode (step S6). On the other hand, if there is no subtitle in step S3, the mode shifts to the wide zoom mode.

[0004]

Since the conventional screen mode switching device is configured as described above, when a scene without a conversation occurs when the auto-wide function is selected and the subtitle-in mode image is viewed. If the video becomes a video without subtitles and this video lasts for a predetermined period of time, the screen mode is switched to the wide zoom mode, the video in the wide zoom mode is displayed on the entire display screen, and when subtitles appear in the displayed video, To subtitle in mode again,
The switching is immediately performed, and for the viewer, the video pattern on the screen suddenly changes, and in some cases, the video pattern on the screen often changes, thereby reducing the interest in watching TV. .

The present invention has been made to solve such a problem, and an object of the present invention is to provide a screen mode switching apparatus capable of preventing unnecessary switching of a video screen from a subtitle in mode.

[0006]

A screen mode switching method according to the present invention has at least a subtitle in mode and a wide zoom mode when there is no subtitle. In the screen mode switching method of the landscape television receiver having the auto wide function for fixing the mode to the subtitle in mode when the mode is shifted, it is determined whether or not the subtitle is in the subtitle in mode (step S11). If it is determined in step S11 that the subtitle-in mode has not been set, the process returns to the auto wide function. If it is determined in step S11 that the subtitle-in mode has been set, it is determined whether or not there is an external control signal ( Step S13), Step S13
If it is determined that there is an external control signal in step S15, the screen mode is released from being fixed to the subtitle in mode, and the mode can be switched (step S15).
If it is determined in step 3 that there is no external control signal, it is determined whether there is a video signal (step S14). If it is determined in step S14 that there is no video signal, it is determined that the screen mode is fixed to the subtitle in mode. This is a screen mode switching method for a landscape television receiver, wherein the mode is released and the mode can be switched (step S15), and if it is determined in step 14 that there is a video signal, the operation returns to the auto wide function.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the screen mode switching device of the present embodiment. In the figure, reference numeral 1 denotes a deselection of an auto-wide function which is input by operating various external keys (not shown), a channel switching, a signal input switching,
External control signal detecting means 2 for detecting a control signal for turning on / off the power supply and the like are image detecting means 2 for judging whether or not an image is transmitted from the received television wave to detect. The determination as to whether or not the video is being transmitted can be made based on whether or not a signal indicating that a video is being transmitted, such as a horizontal synchronization signal, has been detected.

[0008] Reference numeral 3 denotes an auto-wide function, and when the screen mode selects the subtitle in mode, the external control signal detecting means 1 detects the control signal, or the video detecting means 2 interrupts the video. This is a screen mode control unit that outputs a control signal that does not cause the setting of switching of the screen mode from the subtitle in mode to another screen mode until it is detected that no video has been transmitted. Reference numeral 4 denotes a screen mode setting means for setting a screen mode based on the output of the screen mode control means 3.

FIG. 2 is a flowchart showing the operation of the screen mode switching device. First, a screen mode without subtitles, such as a movie broadcast, is set to the subtitle in mode by the screen mode setting means 4 and the subtitle in mode is set. It is assumed that the image has been output (step S11, step S12). In the set subtitle in mode, control signals for deselecting the auto-wide function, switching channels, switching signal input, turning on / off the power, and the like input by operating various keys are provided by an external control signal detecting means. 1 and the screen mode can be switched until the subtitle-in mode is set again (step S
13, step S15). When the external control signal is not detected, the subtitle in mode is fixed,
Next, it is checked by the video detecting means 2 whether the video is temporarily interrupted or the video is not sent, and when it is detected, it is possible to switch to another screen mode until the subtitle in mode is returned again. (Step S14, Step S
15). If it is detected in step S14 that the video is continuously transmitted without interruption by the video detection means 2, switching to another screen mode cannot be executed, and the set subtitle input is not performed. The mode remains fixed.

As described above, in the screen mode switching device according to the present embodiment, when in the subtitle in mode, the video is temporarily interrupted, the video is not transmitted, or the auto-wide mode is operated by operating various keys. The subtitle in mode can be switched to another screen mode only when a control signal for deselecting a function, switching a channel, switching a signal input, turning on / off a power supply, or the like is input. As a result, switching from the subtitle in mode to another screen mode is suppressed, and the trouble of the television viewer due to the frequent change of the screen mode of the video screen during the television viewing is eliminated.

[0011]

According to the present invention, only when the screen mode is set to the subtitle-in mode, the screen mode is switched to the subtitle mode until the video is temporarily interrupted or the video is not transmitted. Since it is fixed to the in mode, the subtitle in mode does not frequently switch to another screen mode, and there is an effect that it is possible to eliminate troublesomeness due to unnecessary switching from the subtitle in mode of the video screen, Only when the screen mode is set to the subtitle in mode, a predetermined external control signal such as a deselection of the auto wide function, a channel switching, a signal input switching, and a power on / off control signal is input from outside. Until the subtitle in mode is switched to another screen mode, unnecessary switching from the subtitle in mode of the video screen There is an effect to eliminate the Riniyoru hassle.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a screen mode switching apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the screen mode switching device according to one embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of a conventional screen mode switching device.

[Explanation of symbols]

 1External control signal detection means 2Video detection means 3Screen mode control means 4Screen mode setting means

Claims (1)

(57) [Claims] [Claim 1] subtitle-in mode, have at a minimum a wide zoom mode of the absence of subtitles, have automatic line transitions between them mode, the mode when the transition to the subtitle-in mode
In the screen mode switching method of the landscape television receiver having the auto wide function for fixing the caption in mode, it is determined whether or not the caption in mode is set (step S11), and the subtitle in mode is set in step S11. If it is determined that the subtitle is not present, the process returns to the auto wide function. If it is determined in step S11 that the subtitle in mode is set, it is determined whether or not there is an external control signal (step S13).
If it is determined that there is an external control signal in step S15, the screen mode is released from being fixed to the subtitle in mode, and the mode can be switched (step S15).
If it is determined in step 3 that there is no external control signal, it is determined whether there is a video signal (step S14). If it is determined in step S14 that there is no video signal, the screen mode is fixed to the subtitle in mode. The screen mode can be switched (step S15), and if it is determined in step S14 that there is a video signal, the process returns to the auto wide function.