JP4565856B2 - Digital broadcast receiver - Google Patents

Description

  The present invention relates to a digital broadcast receiving apparatus that receives a digital broadcast.

  A digital broadcast receiver that receives digital broadcasts using satellites (CS, BS) or terrestrial waves selects any broadcast wave from a plurality of broadcast waves received through a dedicated antenna or terrestrial antenna by a tuner. Then, an arbitrary channel is selected from among a plurality of channels included in the selected broadcast wave by demultiplexing processing, a digital signal of the selected channel is taken out, and a video / audio signal is output by decoding it. .

  In such digital broadcasting, program information relating to a program is sent together with video, and a receiving apparatus can create an electronic program guide (hereinafter referred to as EPG) using this program information. By displaying the EPG, the user can check information on a program currently being broadcast or a program searched according to the user's preference. Program information is also sent in terrestrial digital broadcasting starting in 2003. It seems that the time for which the EPG is used by the user (the time for which the EPG is displayed) will increase further in the future.

  By the way, when a self-luminous flat display such as a plasma display panel (PDP) displays a still image or the like, a burn-in phenomenon occurs when a dark part and a bright part are continuously displayed for a long time. An afterimage can be seen due to the difference in emission characteristics.

Conventionally, broadcast receivers have been equipped with functions to display special video patterns for preventing burn-in (hereinafter referred to as burn-in prevention patterns) and functions to move the video position by several dots. It is recommended to use the function. In general, the burn-in prevention pattern can be set to display frequency by a user operation (see Patent Document 1 and Patent Document 2).
JP 08-179723 A JP-A-11-275483

  However, in the above-described prior art, there is a complaint that the program being viewed cannot be viewed when the burn-in prevention pattern generation mode is entered. Also, in the method of changing the video position, the video position is changed every few minutes, so that the image becomes unnatural and uncomfortable.

  In view of the above circumstances, an object of the present invention is to provide a digital broadcast receiving apparatus that can prevent burn-in without using an image dedicated to burn-in prevention.

  In order to solve the above-described problem, the digital broadcast receiving apparatus according to the present invention is a digital broadcast receiving apparatus having an on-screen display function for displaying an image on a display. And having a control means for controlling the on-screen display function so that at least one of color, brightness, and position may be different, and configured so that all pixels of the display emit light as much as possible by the specific image. It is characterized by that.

  If it is said structure, all the pixels of a display will light-emit uniformly by the said specific image, and burn-in prevention can be aimed at.

  In the above digital broadcast receiving apparatus, one of the R color pixel group, the G color pixel group, and the B color pixel group of the display is caused to emit light, and light emission of the other two pixel groups is controlled. Then, it is preferable to display the specific image. In addition, when displaying the specific image, it is preferable that any one of the R color pixel group, the G color pixel group, and the B color pixel group of the display is made to emit light at a luminance near the maximum luminance. According to this, the light emission amount of each pixel group is increased by the specific image, and it becomes quick to settle down to a constant luminance state, and afterimage is less likely to occur thereafter.

  The digital broadcast receiving apparatus includes means for generating and storing information relating to the light emission luminance of the predetermined area in the specific image, and increasing the light emission luminance in the specific image display this time for the predetermined area having a low light emission level. You may be comprised so that control may be performed. In addition, the information processing apparatus includes a unit that generates and stores information related to the light emission luminance of the predetermined area in the specific image, and is configured to perform control to lower the light emission luminance in the current specific image display for the predetermined area having a high light emission level. May be.

  Further, the digital broadcast receiving apparatus includes means for measuring and storing a display time of a specific image of the same design, and the design of the specific image is changed in the next display after the display time exceeds a predetermined time. May be. In such a configuration, if it is less than the predetermined time, the specific image may not be different between the previous display and the current display, but the difference always occurs, and all the pixels on the screen emit light as much as possible.

  In the digital broadcast receiver, a specific image having a different design may be registered for each broadcaster. In such a configuration, if channel display of the same broadcaster is performed at the same location, the specific image is not different between the previous display and the current display, but the difference will always occur, and all the pixels of the screen Will emit light as much as possible.

  The digital broadcast receiving apparatus may include a calendar function for determining the date and / or day of the week, and the design of the specific image may be changed depending on the current date and / or day of the week. In such a configuration, for example, a specific image of the first design is displayed on the first day of each month, a specific image of the second design is displayed on the second day, a specific image of the first design is displayed on every Monday, and the second design is displayed on Tuesday. That is, the specific image is displayed.

  The digital broadcast receiving apparatus further includes means for generating and storing information relating to a display color of the predetermined area in the specific image, and setting the color of the predetermined area of the specific image this time to be different from the previous color. It may be configured as follows. In such a configuration, although the specific image is not different between the previous display and the current display within the same date, the difference always occurs, and all pixels on the screen emit light as much as possible.

  Further, the digital broadcast receiving apparatus may be configured to store a display color of the predetermined area in the specific image and change the color of the predetermined area in the next specific image display. .

  In the digital broadcast receiving apparatus, the specific image may be an electronic program guide image. In such a configuration, the electronic program guide image may be set to be displayed when the power is turned on. According to this, the opportunity to display the specific image is increased, which is effective in preventing burn-in.

  As described above, according to the present invention, since the burn-in prevention pattern is not generated, there is no complaint that the program being viewed cannot be viewed. Also, since the video position is not changed every few minutes, there is no dissatisfaction that the image becomes unnatural and a sense of incongruity is produced, and the effect of preventing burn-in can be achieved.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5, and here, a configuration for receiving BS (Broadcasting Satellite) digital broadcasting is illustrated. FIG. 1 is a block diagram showing a digital broadcast receiving apparatus 30 of this embodiment, FIGS. 2 to 4 are explanatory diagrams showing examples of EPG screens, and FIG. 5 is a flowchart showing an example of control.

  The antenna 1 is arranged outdoors in a predetermined direction and receives a digital broadcast signal sent from the BS. The antenna 1 is generally provided with a frequency converter, and supplies a received / frequency converted signal to the tuner 2.

  The tuner 2 extracts a signal of a specific frequency from the high frequency digital modulation signal including video / audio data. That is, a process of selecting one from a plurality of transponders of digital broadcasting is performed. Further, the tuner 2 includes a demodulation circuit, a deinterleave circuit, an error correction circuit, and the like, thereby demodulating the selected digital modulation signal and outputting a transport stream.

  The demultiplexer (DEMUX) 3 separates the transport stream into MPEG2 (Moving Picture Experts Group 2) video stream, audio stream, PSI / SI (Program Specific Information / Service Information) and the like. The demultiplexer 3 supplies the video stream and the audio stream to the AV decoder 4, and supplies program information (program name, program start time, program content information, program genre information, etc.) included in the PSI / SI to the CPU 13, The data broadcast data is supplied to the BML (XML) browser 20. As described above, a plurality of channels are multiplexed in the transport stream, and processing for selecting an arbitrary channel from among these is performed in the transport stream from the PSI / SI. Thus, it becomes possible by taking out data such as which packet ID is multiplexed. In addition, transport stream selection (transponder selection) can also be performed based on PSI / SI information.

  The AV decoder 4 includes a video decoder that decodes a video stream and an audio decoder that decodes an audio stream. The video decoder decodes the input variable length code to obtain a quantization coefficient and a motion vector, and performs inverse DCT conversion, motion compensation control based on the motion vector, and the like. The audio decoder decodes the input encoded signal to generate audio data. The video data is output to the video processing circuit 5 via the scaler / OSD circuit 12, and the audio data is output to the audio processing circuit 6.

  The video processing circuit 5 receives the video data that has passed through the scaler / OSD circuit 12, performs D / A conversion, and converts it into, for example, a composite video signal. The audio processing circuit 6 receives the audio data output from the decoder 4 and performs D / A conversion to generate, for example, a right (R) sound analog signal and a left (L) sound analog signal.

  The video output circuit 7 and the audio output circuit 8 include an output resistor, an amplifier, and the like. The AV output terminal 9 is provided with an output unit (a set of left and right audio output terminals, video output terminals, etc.). This output unit is provided with a plasma display 16 a and a speaker 16 b by a video / audio code 17. 16 is connected.

  The scaler / OSD circuit 12 is a circuit that generates video data based on character information and color information instructed to be output from the browser 20 and the CPU 13. The scaler / OSD circuit 12 displays EPG (Electronic Program Guide) based on program information. Data broadcasting display, menu screen display, etc. can be performed.

  The remote control transmitter 10 is a transmitter for sending a command to the broadcast receiving device 30. When a key (not shown) provided on the remote control transmitter 10 is operated, signal light (remote control signal) indicating a command corresponding to the key is transmitted from a light emitting unit (not shown). The remote control light receiver 11 receives the signal light, converts it into an electric signal, and gives it to the CPU 13.

  The memory (RAM, EEPROM, flash memory, ROM, etc.) 14 stores program information for displaying an EPG screen. In addition, in the nonvolatile memory of the memory 14, data defining the design of the EPG screen (the color of the lines forming the table, the color in the frame, the color of the characters such as the program name, and the brightness thereof) is also provided. Existing. A plurality of EPG screen designs are registered, and the design is changed under predetermined conditions. In addition, the nonvolatile memory in the memory 14 displays information on the light emission luminance of a predetermined area in the EPG image, information on the color used in the predetermined area, and an EPG screen for each design. Display time (display time for each EPG design), date on which the EPG screen of each design is displayed, correspondence relationship between the broadcaster and the EPG design, correspondence date and / or day of the week and the EPG design, There is a database that stores the relationship between channel numbers, colors and brightness, design selection history, and the like. The predetermined area in the EPG image includes, for example, each program column area, a time zone display area, and a detailed display area of the selected program, which are areas where the time zone and the channel frame intersect. Further, as information on the light emission luminance, a simple previous luminance value (or information on whether or not the luminance is high), a simple integrated value of the previous emission time and luminance value (or information on whether or not the luminance is high), and the total so far An integrated value of a typical light emission time and a luminance value (or information on whether the luminance is high) or the like can be used. Further, as the color information, it is possible to use simple previous colors, a history of previous colors, information on emission luminance for each color pixel, and the like.

  The CPU 13 performs overall control in the digital broadcast receiving apparatus 30. In particular, as control according to the present invention, the CPU 13 executes control related to EPG display as described below. The CPU 13 includes a calendar function unit (not shown).

  2 to 4 exemplify EPG screens. In this example, the vertical axis (a) is the time, the horizontal axis (b) is the channel, and the program information is displayed as shown in (c). The upper part (d) displays detailed information of the currently selected program (e). In addition, it is assumed that the broadcasters of 103 channels and 141, 142 channels are different. 3 and 4 show EPG screens whose design is changed with respect to the EPG screen of FIG. FIG. 4 corresponds to a case where the dark area in FIG. 3 is changed to a bright area and the bright area is changed to a dark area. Since the partition line of the program column area on the EPG screen is often a dark line, burn-in is likely to occur. FIG. 3 shows an EPG screen in which program breaks are brightened.

  Here, an outline of control on the EPG screen will be described. In this embodiment, the EPG screen is used to prevent the plasma display 16a from being burned. The brightness of the plasma display 16a decreases according to the accumulated light emission amount. When the accumulated light emission amount exceeds a predetermined amount, the plasma display 16a settles to a substantially constant luminance. Therefore, before the constant luminance is settled, the difference in the accumulated light emission amount of each pixel tends to appear as a luminance difference even in the same video signal, and the afterimage is easily recognized. For this reason, if the accumulated light emission amount of each pixel is increased using the EPG screen, the state where the constant brightness is reached can be obtained at an early stage, and afterimages are less likely to occur thereafter. Further, as described above, the difference in the accumulated light emission amount of each pixel is likely to appear as a difference in luminance even in the same video signal, so that there is not much difference in the accumulated light emission amount of each pixel using the EPG screen. It is better not to.

  FIG. 5 shows an example of processing contents. When the EPG display is performed, the CPU 13 acquires the EPG display start time (current time) (step S1). The EPG display start time is used to measure the display time of the EPG to be displayed now. The EPG display may be performed by turning on the power of the broadcast receiving apparatus or by an EPG display instruction by the user. The CPU 13 refers to the database in the memory 14 to determine whether the date when the previous EPG display was performed is different from the current date (step S2). If the dates are the same, it is determined that design switching is not required (NO in step S2), and the process proceeds to step S4. On the other hand, if the dates are different, it is determined that design switching is necessary (YES in step S2), and the EPG design is changed (step S3). Even if the date is the same, the design switching may be executed when the EPG display time by the previously adopted design exceeds the specified time.

  In changing the EPG design, the display color history of each program column area is referred to from the database. As shown in FIG. 3 and the like, when displaying three channel frames, it is assumed that there are three program column areas, and the color is changed for each program area. In this color change, colors that have been used less frequently in the display color history so far are selected. Then, an EPG is displayed using the selected EPG design (step S4). In addition, it is considered that the EPG is scrolled by the user as a color change in each program column area (YES in step S5), and the color of each program column area and the display time of the color are recorded in the RAM of the memory 14 as history information. (Step S6). Note that the position of the program column changes by scrolling the EPG, and the color of a predetermined area on the display changes due to this position change, and all the R color pixels, G color pixels, and B color pixels emit light evenly. Will do. When an instruction to hide the EPG is given by a user operation or the like (YES in step S7), the EPG is hidden (step S8). Then, the history information recorded in the RAM is recorded in the nonvolatile memory of the memory 14 (step S9).

  Note that the time during which each program column area is displayed with high luminance may be managed (history information). That is, in each program column area, the color is not changed (white and black can be reversed), and only the luminance is changed. Whether the brightness is high may be determined by setting a reference brightness and comparing the reference brightness with the brightness of the area. The processing example in this case is based on the following rules.

Here, based on the EPG screen shown in FIG.
Rule 1. In FIG. 2, the low-brightness part is made high-brightness.
Rule 2. In FIG. 2, the high luminance part is made low luminance.
Rule 3. Eliminate parts that are displayed with low brightness as much as possible.

  Rules 1 and 2 have the characteristic that the luminance tends to decrease for several years after the purchase of the plasma display, and the luminance characteristics of the pixels that emit light at a higher luminance than the low-luminance pixels are lower. This is because we want to keep the time as much as possible. In order to satisfy both rule 1 and rule 2, control is performed to increase the light emission luminance in the current specific image display for the region with a low light emission level, and the light emission luminance is decreased in the current specific image display for the region with a high light emission level. You just have to do it. Adopting rule 3 has the following significance. As described above, when the accumulated light emission amount of each pixel is increased, the state where the luminance is constant is obtained at an early stage, and afterimages are less likely to occur thereafter. Therefore, it is desirable to eliminate as much as possible the portion of the EPG screen that is displayed with low luminance (the EPG screen is as bright as possible).

  Rather than simply changing the EPG screen to a bright screen (increasing the brightness of all of the R color pixels, G color pixels, and B color pixels), it is also possible to perform high brightness processing specialized for a certain color pixel It is. For example, an entire EPG pixel group of the R color pixel group, the G color pixel group, and the B color pixel group is caused to emit light at a luminance near the maximum luminance, and the light emission of the other two color pixel groups is controlled to display the EPG screen. Create it. When the entire R color pixel group emits light at a brightness near the maximum brightness, black or cyan colors cannot be obtained on the screen, but other colors can be generated, and an EPG screen is created using these colors. do it. Further, if the entire R color pixel group is caused to emit light at a luminance near the maximum luminance in the previous time, it is preferable to cause the entire G color pixel group to emit light at a luminance near the maximum luminance at this time.

  Also, different colors (designs) may be set for each broadcaster, and the color of each program column area may be determined by the broadcaster. Further, the calendar function for determining the date and / or day of the week may be used to change the design of the EPG image according to the current date and / or day of the week.

  In the above example, burn-in prevention using EPG display is shown. However, a channel number display image (channel number (number) displayed in the upper right part of the screen), a search result display image (for example, a genre search result image) Etc.), a similar design change process may be performed. The channel number display image may be processed so that the position is shifted between the previous time and the current time. In addition, when the EPG display is set by turning on the power of the broadcast receiving apparatus (see step S1 in FIG. 5), the EPG display opportunity increases, and the burn-in prevention effect is enhanced. Further, the scroll frequency is measured, and when the scroll frequency is low, the control for reducing the EPG design switching condition, for example, the specified time for the EPG display time by the design adopted last time is performed. Good.

1 is a block diagram showing a digital broadcast receiver according to an embodiment of the present invention. It is explanatory drawing which showed the example of an EPG screen. It is explanatory drawing which showed the example of an EPG screen. It is explanatory drawing which showed the example of an EPG screen. It is the flowchart which showed the processing content.

Explanation of symbols

1 Antenna 2 BS Digital Tuner 3 Demultiplexer (DEMUX)
4 AV decoder 12 Scaler / OSD circuit 13 CPU
14 memory

Claims (10)

In a digital broadcast receiver having an on-screen display function for displaying an image on a display,
Time information output means for outputting date and time information;
Means for acquiring and holding date / time information on which an electronic program guide image serving as a guide for a user is displayed from the time information output means;
When the electronic program guide image is displayed in response to the power being turned on, if the time elapsed from the date and time when the electronic program guide image was previously displayed satisfies a predetermined condition, the previously displayed electronic program guide image is displayed. A digital broadcast receiving apparatus comprising: control means for controlling the on-screen display function so as to display an electronic program guide image with at least one of color, brightness and position of the image being different. The digital broadcast receiver according to claim 1, wherein
When the current date differs from the date when the previously displayed electronic program guide image is displayed according to the time information output from the time information output means, the color and brightness of the previously displayed electronic program guide image An electronic program guide image is displayed with a difference in at least one of the positions. In a digital broadcast receiver having an on-screen display function for displaying an image on a display,
Time information output means for outputting time information;
Means for acquiring and holding a duration of displaying an electronic program guide image as a guide for a user with the same design from the time information output means;
When displaying the electronic program guide image in response to the fact that the power is ON, if the duration of the previously displayed electronic program guide image exceeds a predetermined time, the electronic program guide displayed on previous said A digital broadcast receiving apparatus comprising: control means for controlling the on-screen display function so as to display an electronic program guide image with at least one of color, brightness and position of the image being different. In a digital broadcast receiver having an on-screen display function for displaying an image on a display,
Time information output means for outputting the current date and / or day of week information;
Means for acquiring and holding the current date and / or day of the week when the electronic program guide image serving as a guide for the user is displayed from the time information output means;
When the electronic program guide image is displayed in response to the power being turned on, the current date and / or day of the week is determined based on the database that defines the correspondence between the date and / or day of the week and the design of the electronic program guide image. And a control means for controlling the on-screen display function so as to display the electronic program guide image with the designed design. In the digital broadcast receiver according to any one of claims 1 to 3,
An electronic program guide image having a different design is registered for each column of a broadcaster of a guide for a user. In the digital broadcast receiver according to any one of claims 1 to 3,
Means for generating and storing information relating to a display color of a predetermined area in the electronic program guide image;
Digital broadcast receiving apparatus characterized by being configured so as to color different from the color of a predetermined area of the electronic program guide image that displays the color of a predetermined area of the electronic program guide image to be the difference to the previous said. In the digital broadcast receiver according to any one of claims 1 to 3,
The electronic program guide image is obtained by causing the entire one of the R color pixel group, the G color pixel group, and the B color pixel group of the display to emit light, and controlling the light emission of the other two pixel groups. A digital broadcast receiver characterized by displaying. The digital broadcast receiver according to claim 7, wherein
When displaying the electronic program guide image, a digital broadcast characterized in that any one of an R color pixel group, a G color pixel group, and a B color pixel group of the display is caused to emit light at a luminance near the maximum luminance. Receiver device. In the digital broadcast receiver according to any one of claims 1 to 3,
Means for generating and storing information relating to light emission luminance of a predetermined area in the electronic program guide image;
A digital broadcast receiving apparatus configured to perform control to increase light emission luminance by displaying the electronic program guide image that is different for a predetermined region whose light emission level is lower than a reference value. In the digital broadcast receiver according to any one of claims 1 to 3,
Means for generating and storing information relating to light emission luminance of a predetermined area in the electronic program guide image;
A digital broadcast receiving apparatus configured to perform control for lowering light emission luminance by displaying the electronic program guide image that is different for a predetermined area whose light emission level is higher than a reference value.

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