JP2009005258A - Television receiver - Google Patents

Abstract

An image quality is automatically adjusted according to a screen size.
The screen size of each small screen when displaying two small screens of the same size is set as a default value, and the ratio of the screen size of the small screen to the default value when displaying the small screen is within a predetermined range. When the ratio is within the range, the luminance is increased in proportion to the screen size, and when the ratio of the screen size to the default value is equal to or smaller than the predetermined value, the sharpness and the contrast are increased in inverse proportion to the screen size.
[Selection] Figure 5

Description

  The present invention relates to a television receiver, and more particularly to a television receiver capable of multi-screen display that displays a plurality of videos on each small screen obtained by virtually dividing a screen.

2. Description of the Related Art Conventionally, in a multi-screen display television receiver that displays two or more images on a single display device, the image adjustment circuit adjusts and displays the images for each screen in an optimal state, so that the contrast between the screens can be reduced. There has been one that makes it easy to see the video on each screen by reducing variations in brightness and the like (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 61-2477

However, in the invention of Patent Document 1, there is a problem that adjustment of an image has to be performed for each screen, and adjustment work is complicated. In addition, because the purpose is to eliminate variations between screens regardless of the size, content, etc. of each screen, each video displayed on each screen during multi-screen display with different screen sizes. There was a problem that it was not always easy to see.
The present invention has been made in view of such a situation, and an object thereof is to provide a television receiver capable of solving the above-described problems.

The television receiver of the present invention is a television receiver that displays each image on a small screen obtained by virtually dividing the screen, and an adjustment value storage unit that stores an adjustment value according to the size of the small screen. And image adjusting means for adjusting each image displayed on each small screen in accordance with the adjustment value stored in the adjustment value storage means.
The adjustment value may be at least one of image quality, contrast, brightness, and sharpness of the video.
Further, the image adjustment means can increase the sharpness in inverse proportion to the size of the small screen in accordance with the adjustment value stored in the adjustment value storage means.
Further, the image adjustment means can increase the contrast in inverse proportion to the size of the small screen according to the adjustment value stored in the adjustment value storage means.
In addition, the video adjustment unit can increase the luminance in proportion to the size of the small screen according to the adjustment value stored in the adjustment value storage unit.

  According to the present invention, the adjustment value according to the size of the small screen obtained by virtually dividing the screen is stored, and each image displayed on each small screen is adjusted according to the adjustment value. Even when images are displayed on a plurality of small screens having different sizes, the visibility of each image can be improved regardless of the screen size.

  FIG. 1 is a block diagram showing a configuration example of an embodiment of a television receiver to which the present invention is applied. In FIGS. 1 to 4, a case where a small screen obtained by virtually dividing a screen is displayed as two screens as a main screen and a sub screen will be mainly described. As shown in FIG. 1, in the present embodiment, a tuner A1 that selects a predetermined channel from a received signal received by an antenna (not shown) and supplies a video / audio signal of the selected channel to an AV switch 3 to be described later. A tuner B2 that selects a predetermined channel from a received signal received by an antenna (not shown) and supplies a video / audio signal of the selected channel to an AV switch 3 to be described later, and is supplied from a tuner A1 and a tuner B2. Of the video and audio signals, the video / audio signal set to be displayed on the main screen is supplied to the main screen decoder 4 and the video / audio signal set to be displayed on the sub screen is used for the sub screen. The AV switch 3 for switching to be supplied to the decoder 5 and the video / audio signal to be displayed on the main screen supplied from the AV switch 3 are decoded. And the decoded video / audio signal to be displayed on the sub-screen supplied from the AV switch 3 and the main screen decoder 4 for supplying the decoded video / audio signal to the AV output control unit 6 to be described later. Of the video / audio signals supplied from the sub-screen decoder 5 and the main-screen decoder 4 that supply signals to the AV output control unit 6 to be described later, the audio signal is supplied to the speaker 11 and the video signal is supplied to the display 12. At the same time, among the video and audio signals supplied from the sub-screen decoder 5, the AV output control unit 6 that supplies the video signal to the display 12 and the channel to be selected for the tuner A1 and the tuner B2 are designated. A sentence for controlling the selected channel to be selected or for displaying a character figure or the like for displaying a selection menu on the display 12 A process for generating graphic data and supplying it to the OSD control unit 7 is executed, a CPU 8 that controls each part, a main memory 9 in which a program for executing various processes by the CPU 8 is developed, and an adjustment described later An adjustment value storage means for storing values and the like, a flash memory 10 for storing data to be saved such as various setting data, and an OSD display signal corresponding to the character graphic data supplied from the CPU 8 are generated and output as AV An OSD control unit 7 supplied to the control unit 6 is configured. The AV output control unit 6 outputs a composite video signal obtained by synthesizing the video signal supplied from the main screen decoder 4 or the video signal supplied from the sub screen decoder 5 and the OSD display signal supplied from the OSD control unit 7. It is supposed to be. The AV output control unit 6 includes video adjustment means for adjusting each video displayed on each small screen in accordance with the adjustment value stored in the adjustment value storage means included in the flash memory 10.

  FIG. 2 is a diagram illustrating an example of adjustment contents set for each screen. When the multi-screen display is performed on the display 12, adjustment contents and adjustment value storage areas corresponding to the number of displayable screens are provided in the flash memory 10 for each screen, and adjustment contents and adjustment values corresponding to each screen are stored. Is done. 2A shows an example of adjustment contents set for screen A (for example, the main screen), and FIG. 2B shows an example of adjustment contents set for screen B (for example, the sub-screen). Show. Adjustment contents include screen size, contrast, brightness, sharpness, and the like. In the present embodiment, the adjustment value storage means also stores an adjustment value for the ratio of the display screen size to the reference screen size.

  For example, in the case of a two-screen display in which two screens are displayed on the display 12, the size of each screen when displaying two screens of the same size is set as a default value. For example, when the size of the screen is changed within the range of the limitation, the contrast and the luminance are changed according to the change of the screen size. For example, the contrast and the luminance are increased in proportion to the size of the screen size. As a result, a screen that is estimated to have a higher priority (a screen having a larger screen size) can be displayed brighter. Alternatively, only the luminance may be changed in proportion to the screen size.

  Further, for example, a limit of less than 50% is provided with respect to the default value of the screen size, and when the screen size changes within the range of the limit, the sharpness is changed according to the change of the screen size. For example, the degree of sharpness is increased in inverse proportion to the screen size. As a result, the smaller the screen, the clearer the screen is displayed. Therefore, when a character broadcast or the like is displayed on a small-size screen, it is possible to visually recognize characters and the like. Alternatively, the sharpness and contrast may be changed in inverse proportion to the screen size.

  FIG. 3 is a flowchart for explaining a procedure for automatically adjusting sharpness and contrast to improve visibility. First, in step S10, when a multi-screen display button (not shown) is pressed to instruct multi-screen display by the user, the display mode is switched from single-screen display to multi-screen display under the control of the CPU 8.

  Next, in step S <b> 11, an operation screen switching button (not shown) is pressed by the user, and a screen whose screen size is to be changed is selected from a plurality of screens displayed on the display 12.

  Next, in step S12, when the user operates a screen size change button (not shown) and designates the change of the screen size, the CPU 8 controls the screen size designated in step S11 to the designated size. Be changed.

  In step S13, the CPU 8 calculates the size of the entire screen including the screen whose size has been changed. In step S14, the size of each screen is sequentially compared with the default screen size.

  If the screen size is smaller than 50% of the default value as a result of the screen size comparison for each screen, in step S15, the CPU 8 performs control to increase the sharpness in inverse proportion to the screen size. In step S16, the CPU 8 performs control to increase the contrast in inverse proportion to the screen size. Steps S15 and S16 are performed on the entire screen whose screen size has been calculated in step S13. Thereafter, the process proceeds to step S17. On the other hand, if the screen size is 50% or more of the default value in step S14, the process proceeds to step S17.

  In step S <b> 17, it is determined whether or not the user has pressed the multi-screen display button and instructed the transition from the multi-screen to the single screen. As a result, when it is determined that the transition from the multi-screen to the one-screen is not instructed, the process returns to step S12, and the processes after step S12 are repeatedly executed. On the other hand, when it is determined that the transition from the multi-screen to the single screen is instructed, the process proceeds to step S18.

  In step S <b> 18, the degree of sharpness of the display 12 is returned to the degree of sharpness during single-screen display that is set in advance and held in the flash memory 10 under the control of the CPU 8.

  In step S <b> 19, the degree of contrast of the display 12 is returned to the degree of contrast at the time of single-screen display that is set in advance and held in the flash memory 10 under the control of the CPU 8. Thereafter, the process ends.

  FIG. 4 is a flowchart for explaining a procedure for automatically adjusting the luminance for clarifying the priority. First, in step S20, when a multi-screen display button (not shown) is pressed by the user to instruct multi-screen display, the display mode is switched from single-screen display to multi-screen display under the control of the CPU 8.

  Next, in step S21, an operation screen switching button (not shown) is pressed by the user, and a screen whose screen size is to be changed is selected from a plurality of screens displayed on the display 12.

  Next, when the screen size change button (not shown) is operated by the user in step S22 and the change of the screen size is designated, the screen size designated in step S21 is changed to the designated size by the control of the CPU 8. Be changed.

  In step S23, the CPU 8 calculates the size of the entire screen including the screen whose size has been changed. In step S24, the size of each screen is sequentially compared with the default screen size.

  As a result of comparing the screen sizes of the respective screens, if the screen size is larger than 80% of the default value and smaller than 120% of the default value, the CPU 8 increases the luminance in proportion to the screen size in step S25. Control is performed. The process of step S25 is performed for all the screens for which the screen size has been calculated in step S23. Thereafter, the process proceeds to step S26. On the other hand, if the screen size is 80% or less of the default value or 120% or more of the default value in step S24, the process proceeds to step S26.

  In step S26, it is determined whether or not the user has pressed the multi-screen display button and instructed the transition from the multi-screen to the single screen. As a result, when it is determined that the transition from the multi-screen to the one-screen is not instructed, the process returns to step S12, and the processes after step S12 are repeatedly executed. On the other hand, if it is determined that the transition from the multi-screen to the single screen is instructed, the process proceeds to step S27.

  In step S <b> 27, the brightness of the display 12 is returned to the brightness at the time of one-screen display that is set in advance and held in the flash memory 10 under the control of the CPU 8. Thereafter, the process ends.

  FIG. 5 is a diagram illustrating an example of multi-screen display. FIG. 5A shows a display example when screen A and screen B have the same size. In this case, the screen sizes of the screen A and the screen B are set as default values.

  FIG. 5B shows an example in which the screen size of the screen A is increased and the screen size of the screen B is decreased. In this case, when the condition of step S24 in FIG. 4 is satisfied, the screen A having a larger screen size has a higher priority than the screen B, and the luminance is controlled to increase in proportion to the screen size. Further, the screen B is controlled so that the luminance decreases in proportion to the screen size when the condition of step S24 in FIG. 4 is satisfied.

  FIG. 5C shows an example in which the screen size of the screen A is increased, the screen size of the screen B is decreased, and the screen C is additionally displayed. The sizes of screen A and screen B are the same as those in FIG. When the screen size of the screen C satisfies the condition of step S14 in FIG. 3, the CPU 8 performs control to increase the sharpness in inverse proportion to the screen size of the screen C and further increase the contrast.

  As described above, according to this embodiment, it is possible to make the screen brighter as the screen size is larger and darker as the screen size is smaller. Thereby, it is possible to improve the visibility of a screen having a large screen size with high viewing priority.

  Also, the sharpness and contrast can be increased as the screen size is smaller. Thereby, the visibility of characters and figures displayed on a small screen can be improved.

  In this way, image quality (luminance, sharpness, contrast, etc.) can be automatically adjusted according to the screen size.

  It should be noted that the configuration and operation of the above-described embodiment are examples, and it goes without saying that they can be changed as appropriate without departing from the spirit of the present invention. In addition, the specific numerical values used in the above embodiments are examples and are not limited to these.

  The present invention can be applied not only to a television receiver, but also to other devices that display video.

It is a block diagram which shows the structural example of one Embodiment of the television receiver with which this invention is applied. It is a figure which shows the example of the content of adjustment set for every screen. It is a flowchart for demonstrating the procedure which adjusts sharpness and contrast automatically for visibility improvement. It is a flowchart for demonstrating the procedure which adjusts a brightness | luminance automatically for priority clarification. It is a figure which shows the example of a multiscreen display.

Explanation of symbols

1 Tuner A
2 Tuner B
3 AV Switch 4 Decoder for Main Screen 5 Decoder for Sub Screen 6 AV Output Control Unit 7 OSD Control Unit 8 CPU
9 Main memory 10 Flash memory 11 Speaker 12 Display

Claims (5)

A television receiver that displays each image on a small screen virtually divided into screens,
Adjustment value storage means for storing an adjustment value according to the size of the small screen;
A television receiver, comprising: video adjustment means for adjusting each video displayed on each small screen in accordance with the adjustment value stored in the adjustment value storage means. The television receiver according to claim 1, wherein the adjustment value is at least one of image quality, contrast, luminance, and sharpness of the video. 3. The television receiver according to claim 2, wherein the video adjustment unit increases the sharpness in inverse proportion to the size of the small screen according to the adjustment value stored in the adjustment value storage unit. Machine. 3. The television receiver according to claim 2, wherein the video adjustment unit increases the contrast in inverse proportion to the size of the small screen according to the adjustment value stored in the adjustment value storage unit. Machine. The television image receiving device according to claim 2, wherein the video adjusting means increases the luminance in proportion to the size of the small screen in accordance with the adjustment value stored in the adjustment value storage means. Machine.

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