JP4475270B2 - Broadcast receiver - Google Patents

Description

  The present invention relates to a broadcast receiving apparatus configured to receive a digital television broadcast and output it to an FPD (Flat Panel Display) such as a PDP (Plasma Display Panel). In particular, the present invention relates to a broadcast receiving apparatus configured to be able to execute a screen saver which is a process for preventing PDP burn-in.

  In recent years, an FPD such as a PDP has become widespread as a display that receives a digital television broadcast and displays it from the outside. In a display such as a PDP, dot display is performed at a fixed point set in advance. When the voltage used for this display is high and applied for a long time, the fluorescence deposited on the display surface is displayed. Substances will be denatured. For this reason, in a display such as a PDP, when still images are continuously displayed for a long time, so-called burn-in (= afterimage) occurs, and the quality of an image displayed on the screen may be reduced.

Therefore, various displays have been proposed to prevent burn-in. For example, it is determined whether or not the video signal is a still image video signal, and when it is determined that the video signal is a still image video signal, display dots are moved (= screen saver is activated) to prevent burn-in. A display is disclosed (see Patent Document 1).
JP 2006-201285 A

  However, in the above display, when the video signal is a still image video signal, the screen saver is activated. Therefore, when a part of the video signal is a still image video signal, the screen saver is not activated and Burn-in may occur at the corresponding position.

  The present invention has been made in view of the above problems, and an object thereof is to provide a broadcast receiving apparatus capable of reliably preventing burn-in.

  In order to achieve the above object, the broadcast receiving apparatus according to claim 1 is a broadcast receiving apparatus configured to receive a digital television broadcast and output it to a PDP (Plasma Display Panel). An information amount calculation unit that calculates a video bit rate that is an information amount of video included in (Transport Stream), and a maximum value within a predetermined period of a video bit rate that is calculated by the information amount calculation unit Maximum value calculating means, resolution information indicating the resolution of the screen output to the PDP, frame rate information indicating the frequency of updating the screen output to the PDP, and a scanning method of the screen output to the PDP On the basis of the scanning method information shown, a screen saver that is a process for preventing the PDP from burning is activated. A threshold setting unit that sets a determination threshold that is a threshold for determining whether or not, and whether or not the maximum value obtained by the maximum value calculating unit is equal to or less than the determination threshold set by the threshold setting unit. Based on an activation determination unit that determines whether to activate the screen saver, a saver execution unit that executes a screen saver when the activation determination unit determines to activate the screen saver, and a screen saver that executes the screen saver. When the elapsed time calculated by the elapsed time calculator is less than or equal to a predetermined time set in advance, the saver executing unit Prohibiting means for prohibiting activation of the screen saver, and the saver executing means includes the screener. As saver, an image displayed on the PDP, by at least one pixel from a reference display position, is characterized by moving at least one vertical and horizontal directions.

  The broadcast receiving apparatus according to claim 2 is a broadcast receiving apparatus configured to receive a digital television broadcast and output it to an FPD (Flat Panel Display), and is included in a receiving TS (Transport Stream). Information amount calculation means for obtaining a video bit rate that is the amount of video information, and whether or not to activate a screen saver that is a process for preventing the FPD from being burned based on the video bit rate obtained by the information amount calculation means And a saver execution means for executing a screen saver when the activation determination means determines that the screen saver is to be activated.

Further, the image processing apparatus further comprises a maximum value calculating means for obtaining a maximum value within a predetermined period of the video bit rate obtained by the information amount calculating means, and the activation determining means is obtained by the maximum value calculating means. Whether or not to activate the screen saver is determined based on the maximum value.

The broadcast receiving device according to claim 3 is the broadcast receiving device according to claim 2 , wherein the resolution information indicating the resolution of the screen output to the FPD and the frequency of updating the screen output to the FPD are updated. A determination threshold that is a threshold for determining whether or not to activate the screen saver is set based on at least one piece of information on the frame rate information and the scanning method information indicating the scanning method of the screen output to the FPD. Threshold value setting means, and the activation determination means activates the screen saver based on whether or not the maximum value obtained by the maximum value calculation means is equal to or less than the determination threshold value set by the threshold value setting means. It is characterized by determining whether or not.

The broadcast receiving device according to claim 4 is the broadcast receiving device according to claim 2 or claim 3 , wherein an elapsed time calculating means for obtaining an elapsed time from when the screen saver is executed by the saver executing means; And, when the elapsed time obtained by the elapsed time calculating means is equal to or less than a predetermined time set in advance, the saver executing means comprises prohibiting means for prohibiting activation of the screen saver. Yes.

The broadcast receiving device according to claim 5 is the broadcast receiving device according to any one of claims 2 to 4 , wherein the saver execution unit displays an image displayed on the FPD as the screen saver, It is characterized in that it is moved in at least one direction from top to bottom and right and left by at least one pixel from the reference display position.

A broadcast receiving apparatus according to a sixth aspect is the broadcast receiving apparatus according to any one of the second to fifth aspects, wherein the FPD is a PDP (Plasma Display Panel).

  According to the broadcast receiving apparatus according to claim 1, a video bit rate, which is an information amount of video included in the received TS, is obtained, and based on the obtained video bit rate, PDP burn-in is prevented. Whether or not to activate the screen saver, which is a process, is determined. If it is determined to activate the screen saver, the screen saver is executed, so that it is possible to reliably prevent PDP burn-in.

  That is, since it is determined whether or not to activate a screen saver that is a process for preventing PDP burn-in based on the video bit rate that is the amount of video information included in the TS, for example, the video bit rate is set in advance. If it is equal to or less than the predetermined threshold value, it is estimated that a part of the video is a still image (for example, if the video has a person in the background, the part corresponding to the background is a still image). Therefore, also in this case, it is possible to reliably prevent PDP burn-in by determining that the screen saver is activated.

  In addition, the maximum value of the video bit rate within a predetermined period set in advance is obtained, and it is determined whether to activate the screen saver based on the obtained maximum value, so the screen saver is activated at an appropriate frequency. Can be made.

  That is, since it is determined whether or not the screen saver is activated based on the maximum value of the video bit rate within a predetermined period, a still image (= including a case where a part of the video is a still image). Is determined to activate the screen saver only when it is displayed for a predetermined period (for example, 30 seconds) or longer, the screen saver can be activated at an appropriate frequency by setting the predetermined period to an appropriate value. It is.

  Further, based on the resolution information indicating the resolution of the screen output to the PDP, the frame rate information indicating the frequency of updating the screen output to the PDP, and the scanning method information indicating the scanning method of the screen output to the PDP. A determination threshold value that is a threshold value for determining whether to activate the screen saver is set. Since it is determined whether or not the screen saver is to be activated based on whether or not the maximum value of the video bit rate within a preset predetermined period is equal to or less than the set determination threshold, a more appropriate frequency Can activate the screen saver.

  That is, the higher the resolution indicating the resolution of the screen output to the PDP and the higher the frame rate indicating the frequency of updating the screen output to the PDP, the higher the video bit rate, and the scanning of the screen output to the PDP. When the method is the progressive method, the video bit rate is increased as compared with the case where the scanning method of the screen output to the PDP is the interlace method. Therefore, based on the resolution information, the frame rate information, and the scanning method information. Since a determination threshold that is a threshold for determining whether or not to activate the screen saver is set, an appropriate determination threshold can be set. Moreover, since it is determined whether or not the screen saver is to be activated based on the determination threshold set to an appropriate value, the screen saver can be activated at an even more appropriate frequency.

  In addition, since the elapsed time from the point in time when the screen saver is executed is obtained and the obtained elapsed time is less than or equal to a predetermined time set in advance, the screen saver is prohibited from being activated. Can be activated.

  In other words, when the elapsed time from the previous screen saver execution timing is less than or equal to a predetermined time, the screen saver is prohibited from being activated, so that it is more appropriate to set the predetermined time to an appropriate value (for example, 1 minute). The screen saver can be activated at an appropriate frequency.

  In addition, as a screen saver, the video displayed on the PDP is moved in at least one pixel in the vertical and horizontal directions by at least one pixel from the reference display position, thereby suppressing deterioration in the quality of the video displayed on the PDP. In addition, the PDP can be prevented from being burned.

  According to the broadcast receiving apparatus of claim 2, the video bit rate that is the amount of video information included in the received TS is obtained, and based on the obtained video bit rate, the FPD burn-in is prevented. Whether or not to activate the screen saver, which is a process, is determined, and when it is determined to activate the screen saver, the screen saver is executed, so that the FPD burn-in can be reliably prevented.

  That is, based on the video bit rate that is the amount of video information included in the TS, it is determined whether or not to activate the screen saver, which is a process for preventing the FPD burn-in, and for example, the video bit rate is set in advance. If it is equal to or less than the predetermined threshold value, it is estimated that a part of the video is a still image (for example, if the video has a person in the background, the part corresponding to the background is a still image). Therefore, also in this case, it is possible to reliably prevent the FPD from being burned by determining that the screen saver is activated.

In addition , the maximum value of the video bit rate within a predetermined period set in advance is obtained, and it is determined whether to activate the screen saver based on the obtained maximum value, so the screen saver is activated at an appropriate frequency. Can be made.

  That is, since it is determined whether or not the screen saver is activated based on the maximum value of the video bit rate within a predetermined period, a still image (= including a case where a part of the video is a still image). Is determined to activate the screen saver only when it is displayed for a predetermined period (for example, 30 seconds) or longer, the screen saver can be activated at an appropriate frequency by setting the predetermined period to an appropriate value. It is.

According to the broadcast receiving device according to claim 3 , resolution information indicating the resolution of the screen output to the FPD, frame rate information indicating the frequency of updating the screen output to the FPD, and a screen output to the FPD Based on at least one piece of information of the scanning method information indicating the scanning method, a determination threshold value that is a threshold value for determining whether to activate the screen saver is set. Since it is determined whether or not the screen saver is to be activated based on whether or not the maximum value of the video bit rate within a preset predetermined period is equal to or less than the set determination threshold, a more appropriate frequency Can activate the screen saver.

  That is, the higher the resolution indicating the resolution of the screen output to the FPD and the higher the frame rate indicating the frequency of updating the screen output to the FPD, the higher the video bit rate, and the scanning of the screen output to the FPD. When the method is the progressive method, the video bit rate increases as compared with the case where the scanning method of the screen output to the FPD is the interlace method, and therefore at least one of resolution information, frame rate information, and scanning method information. Since a determination threshold value that is a threshold value for determining whether or not to activate the screen saver is set based on the above information, an appropriate determination threshold value can be set. Moreover, since it is determined whether or not the screen saver is to be activated based on the determination threshold set to an appropriate value, the screen saver can be activated at an even more appropriate frequency.

According to the broadcast receiving device according to claim 4 , the elapsed time from the time when the screen saver is executed is obtained, and when the obtained elapsed time is less than or equal to a predetermined time set in advance, the activation of the screen saver is prohibited. Therefore, the screen saver can be activated at a more appropriate frequency.

  In other words, when the elapsed time from the previous screen saver execution timing is less than or equal to a predetermined time, the screen saver is prohibited from being activated, so that it is more appropriate to set the predetermined time to an appropriate value (for example, 1 minute). The screen saver can be activated at an appropriate frequency.

According to the broadcast receiving device of claim 5 , as the screen saver, the video displayed on the FPD is moved by at least one pixel from the reference display position in at least one direction, up, down, left, and right. It is possible to suppress the degradation of the quality of the video displayed on the screen and to prevent the FPD from being burned.

According to the broadcast receiving apparatus of the sixth aspect , since the FPD is made of PDP, the effect of preventing burn-in becomes remarkable.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of the configuration of a digital broadcast receiving apparatus according to the present invention. The digital broadcast receiver 1 (corresponding to a broadcast receiving apparatus) receives a television broadcast and outputs it to a PDP 183 and a speaker 163, which will be described later. The MPU 11, RAM 12, ROM 13, operating unit 14, receiving unit 15, An audio output unit 16, an MPEG2 decoding unit 17, and an image output unit 18 are provided.

  An MPU (Micro Processing Unit) 11 controls the operation of the entire digital broadcast receiver 1. A RAM (Random Access Memory) 12 stores information such as audio information and moving image information in a readable and writable manner. A ROM (Read Only Memory) 13 stores a control program for operating the MPU 11 and the like.

  The operation unit 14 receives various operations such as power ON / OFF operation and channel selection. The receiving unit 15 receives and demodulates a television broadcast, and includes an antenna unit 151, a tuner unit 152, an A / D conversion unit 153, a demodulation unit 154, and a TS demultiplexer 155.

  The antenna unit 151 receives a television broadcast wave. The tuner unit 152 selects a broadcast of a preset channel from the television broadcast wave received by the antenna unit 151. The A / D conversion unit 153 converts an output signal (= analog signal) from the tuner unit 152 into digital information. The demodulator 154 demodulates the output information from the A / D converter 153. A TS (Transport Stream) demultiplexer 155 separates and outputs the output information demodulated by the demodulator 154 for each type (= video information, audio information, channel information, etc.).

  The audio output unit 16 outputs audio corresponding to one television broadcast (or other television broadcast) received by the reception unit 15, and includes a D / A conversion unit 161 and an audio signal output unit 162. And a speaker 163. The D / A converter 161 converts the audio information (= digital information) output from the TS demultiplexer 155 into an analog signal. The audio signal output unit 162 outputs the audio signal converted into an analog signal by the D / A conversion unit 161. The speaker 163 outputs audio corresponding to the audio signal output from the audio signal output unit 162.

  An MPEG (Motion Picture Experts Group) 2 decoding unit 17 decodes the moving picture information output from the TS demultiplexer 155 into the moving picture information before compression.

  The image output unit 18 outputs the moving image information decoded by the MPEG2 decoding unit 17, and includes an NTSC encoding unit 181, a video signal output unit 182, and a PDP 183. An NTSC (National Television Standards Committee) encoding unit 181 converts the moving image information decoded by the MPEG2 decoding unit 17 into an NTSC television signal. The video signal output unit 182 outputs the NTSC television signal output from the NTSC encoding unit 181 to the PDP 183. The PDP 183 (corresponding to FDP) displays a moving image corresponding to the television signal output from the video signal output unit 182.

  Next, the operation when the digital broadcast receiver 1 receives a broadcast will be described. First, the transmitted digital broadcast wave is received by the antenna unit 151. When a channel selection operation is accepted via the operation unit 14, the tuner unit 152 switches the transponder (Transponder) received. The received digital broadcast wave is converted into digital information by the A / D converter 153 and demodulated by the demodulator 154.

  The digital broadcast wave is transmitted as a TS (Transport Stream) packet from the transmission side (transmission station). The TS packet is composed of control information including moving image information, audio information, channel information, and the like. This control information is output separately by the TS demultiplexer 155 and stored in the RAM 12. The audio information read from the RAM 12 is converted into an analog signal by the D / A converter 161, and the audio is output from the speaker 163 through the audio signal output unit 162.

  Also, the moving image information read from the RAM 12 is decoded into the moving image information before compression by the MPEG2 decoding unit 17, converted into an NTSC television signal by the NTSC encoding unit 181, and the video signal output unit 182 The moving image is displayed on the PDP 183.

  FIG. 2 is a block diagram showing an example of the configuration of the main part of the digital broadcast receiver 1 according to the present invention. The MPU 11 of the digital broadcast receiver 1 shown in FIG. 1 functionally includes an information amount calculation unit 111, a maximum value calculation unit 112, a threshold setting unit 113, an activation determination unit 114, a saver execution unit 115, an elapsed time calculation unit 116, And the prohibition part 117 is provided.

  Here, the MPU 11 reads and executes a control program stored in advance in the ROM 13 or the like shown in FIG. 1 to execute an information amount calculation unit 111, a maximum value calculation unit 112, a threshold setting unit 113, an activation determination unit 114, a saver. It functions as functional units such as the execution unit 115, the elapsed time calculation unit 116, and the prohibition unit 117.

  Further, among various data stored in the RAM 12 and ROM 13 shown in FIG. 1, data that can be stored in a removable recording medium is, for example, a hard disk drive, an optical disk drive, a flexible disk drive, a silicon disk drive, a cassette medium reader, etc. In this case, the recording medium is, for example, a hard disk, an optical disk, a flexible disk, a CD (Compact Disk), a DVD (Digital Versatile Disk), a semiconductor memory, or the like.

  The information amount calculation unit 111 (corresponding to the information amount calculation unit) obtains a video bit rate that is the information amount of the video included in the TS received via the reception unit 15. Here, the information amount calculation unit 111 obtains a video bit rate (bit / sec) per unit time (for example, one second) set in advance, for example.

  The maximum value calculation unit 112 (corresponding to the maximum value calculation unit) obtains the maximum value BM within a predetermined period (for example, 30 seconds) of the video bit rate obtained by the information amount calculation unit 111. It is.

  The threshold setting unit 113 (corresponding to the threshold setting means) outputs resolution information indicating the resolution of the screen output to the PDP, frame rate information indicating the frequency of updating the screen output to the PDP, and the PDP. Based on the scanning method information indicating the scanning method of the screen, a determination threshold SH that is a threshold for determining whether or not to activate a screen saver, which is a process for preventing PDP burn-in, is set.

  FIG. 3 is a chart showing an example of the determination threshold value SH set by the threshold value setting unit 113. From left to right, the vertical resolution (dots), horizontal resolution (dots), frame rate (Hz), scanning method, determination threshold (Mbit / s), and maximum video bit rate (Mbit / s) are shown. ing. The resolution is represented by the number of dots on the PDP screen. For example, when the resolution in the vertical direction is “1080 dots” and the resolution in the horizontal direction is “1920 dots”, the resolution is “1080 × It is a screen having 1920 ”pixels.

  The frame rate indicates the number of times the screen is updated per second. For example, in the case of “30 Hz”, it means that the screen is updated only 30 times per second. In the column of the scanning method, “progressive” is a method of updating the scanning lines continuously, and “interlace” is a method of updating the scanning lines every other line.

  As shown in the figure, for example, when the resolution is “1080 × 1920”, the frame rate is “30 Hz”, and the scanning method is “progressive”, the determination threshold SH is “1.6 Mbit / s. Is set. For example, when the resolution is “480 × 640”, the frame rate is “30 Hz”, and the scanning method is “progressive”, “0.3 Mbit / s” is set as the determination threshold SH. The That is, the determination threshold BM is set to 2% of the maximum video bit rate here.

  Here, the table shown in FIG. 3 is stored in advance in the RAM 12 or the like shown in FIG. 1, and the threshold value setting unit 113 reads the corresponding determination threshold value SH from the table stored in the RAM 12, thereby setting the determination threshold value SH. It is to set. Note that the PDP resolution information, frame rate information, and scanning method information are set in advance and stored in the RAM 12 shown in FIG.

  Returning to FIG. 2 again, the functional configuration of the MPU 11 will be described. The activation determination unit 114 (corresponding to the activation determination unit) is based on whether or not the maximum value BM of the video bit rate obtained by the maximum value calculation unit 112 is equal to or less than the determination threshold value SH set by the threshold value setting unit. Thus, it is determined whether to activate the screen saver. That is, here, when the maximum value BM for 30 seconds of the video bit rate is equal to or less than the determination threshold BM (= 2% of the maximum video bit rate), it is estimated that at least a part of the video is a still image. The clean saver is activated.

  A saver execution unit 115 (corresponding to a saver execution unit) executes a screen saver when the activation determination unit 114 determines that the screen saver is to be activated. Here, the saver execution unit 115 serves as a screen saver to move the image displayed on the PDP in one direction (for example, left and right) up and down and left and right by one pixel from the reference display position. That is, the saver execution unit 115 moves the image displayed on the PDP to the left when the odd-numbered screen saver is executed, and moves the image displayed on the PDP to the right when the even-numbered screen saver is executed. It is.

  The elapsed time calculation unit 116 (corresponding to the elapsed time calculation means) has a timekeeping function such as a timer, and obtains an elapsed time from when the screen saver is executed by the saver execution unit 115.

  The prohibition unit 117 (corresponding to a prohibition unit) instructs the saver execution unit 115 when the elapsed time calculated by the elapsed time calculation unit 116 is equal to or less than a predetermined time (for example, 1 minute) set in advance. The screen saver is prohibited from starting.

  FIG. 3 is a flowchart showing an example of the operation of the digital broadcast receiver 1 (mainly the MPU 11). First, the video amount is obtained by the information amount calculation unit 111 (S101). Then, the maximum value calculation unit 112 obtains the maximum value BM of the video bit rate within a predetermined period (for example, 30 seconds) (S103). Next, the threshold setting unit 113 sets the determination threshold SH (S105).

  Next, the activation determination unit 114 determines whether or not the maximum value BM is equal to or less than the determination threshold value SH (S107). If it is determined that the maximum value BM is not equal to or less than the determination threshold SH (= the maximum value BM is greater than the determination threshold SH) (NO in S107), the process returns to step S101, and the processes after step S101 are repeated. Executed. When it is determined that the maximum value BM is less than or equal to the determination threshold SH (YES in S107), the prohibition unit 117 sets a predetermined time that has elapsed in advance since the screen saver was last executed by the saver execution unit 115. It is determined whether or not the time (for example, 1 minute) is exceeded (S109).

  If it is determined that the elapsed time is not longer than a predetermined time (for example, 1 minute) (the elapsed time is less than the predetermined time (for example, 1 minute)) (NO in S109), the process returns to step S101. The processes after step S101 are repeatedly executed. When it is determined that the elapsed time is equal to or longer than a predetermined time (for example, 1 minute) (YES in S109), the screen saver is executed by the saver execution unit 115 (S111), and the process is terminated.

  In this way, the video bit rate that is the amount of video information included in the received TS is obtained, and based on the obtained video bit rate, a screen saver that is a process for preventing the burn-in of the PDP 183 is activated. If it is determined whether or not the screen saver is to be activated, the screen saver is executed, so that it is possible to reliably prevent the PDP 183 from being burned.

  That is, since it is determined whether or not to activate the screen saver, which is a process for preventing burn-in of the PDP 183, based on the video bit rate that is the amount of video information included in the TS, for example, the video bit rate is preset. If it is equal to or less than the predetermined threshold value, it is estimated that a part of the video is a still image (for example, if the video has a person in the background, the part corresponding to the background is a still image). Therefore, also in this case, it is possible to reliably prevent the PDP 183 from being burned by determining that the screen saver is activated.

  Further, the maximum value BM of the video bit rate within a predetermined period set in advance is obtained, and it is determined whether to activate the screen saver based on the obtained maximum value BM. Can be activated.

  In other words, since it is determined whether or not the screen saver is activated based on the maximum value BM within a predetermined period of the video bit rate, a still image (= including a case where a part of the video is a still image). ) Is displayed for a predetermined period (for example, 30 seconds) or longer, it is determined that the screen saver is activated. Therefore, by setting the predetermined period to an appropriate value (for example, 30 seconds) A screen saver can be activated.

  Further, based on resolution information indicating the resolution of the screen output to the PDP 183, frame rate information indicating the frequency of updating the screen output to the PDP 183, and scanning method information indicating the scanning method of the screen output to the PDP 183. A determination threshold value SH that is a threshold value for determining whether to activate the screen saver is set. Since it is determined whether or not the screen saver is to be activated based on whether or not the maximum value BM within a predetermined period of the video bit rate is equal to or less than the set determination threshold SH, it is more appropriate. The screen saver can be activated at a frequent frequency.

  That is, the higher the resolution indicating the resolution of the screen output to the PDP 183 and the higher the frame rate indicating the frequency of updating the screen output to the PDP 183, the higher the video bit rate, and the scanning of the screen output to the PDP 183. When the method is the progressive method, the video bit rate is increased as compared with the case where the scanning method of the screen output to the PDP 183 is the interlace method. Therefore, based on the resolution information, the frame rate information, and the scanning method information. Since the determination threshold value SH that is a threshold value for determining whether to activate the screen saver is set, an appropriate determination threshold value SH can be set. Further, since it is determined whether or not to activate the screen saver based on the determination threshold value SH set to an appropriate value, the screen saver can be activated at a more appropriate frequency.

  In addition, since the elapsed time from the time when the screen saver is executed is obtained and the obtained elapsed time is equal to or less than a predetermined time (for example, 1 minute) set in advance, the activation of the screen saver is prohibited. Furthermore, the screen saver can be activated at an appropriate frequency.

  In other words, when the elapsed time from the previous screen saver execution timing is less than or equal to a predetermined time, the screen saver is prohibited from being activated, so that it is more appropriate to set the predetermined time to an appropriate value (for example, 1 minute). The screen saver can be activated at an appropriate frequency.

  In addition, as a screen saver, the image displayed on the PDP 183 is moved in the left-right direction by one pixel from the reference display position, so that deterioration in the quality of the image displayed on the PDP 183 is suppressed, and the PDP 183 is burned. Can be prevented.

The present invention can also be applied to the following forms.
(A) In the present embodiment, the case where the FDP is the PDP 183 disposed in the digital broadcast receiver 1 has been described. However, the FDP may be configured as a device separate from the digital broadcast receiver 1. Good. For example, the FDP may be an FDP composed of an LCD (Liquid Crystal Display) or the like disposed in a personal computer or the like.

  (B) In the present embodiment, the case in which the FDP is the PDP 183 has been described, but the FDP may be another form of FDP. For example, the FDP may be an LCD (Liquid Crystal Display), an organic EL (Electro-Luminescence) display, or the like.

  (C) In this embodiment, the threshold value setting unit 113 outputs resolution information indicating the resolution of the screen output to the PDP, frame rate information indicating the frequency of updating the screen output to the PDP, and the PDP. Although the case where the determination threshold value SH is set based on the scanning method information indicating the screen scanning method has been described, the threshold value setting unit 113 displays the resolution information indicating the resolution of the screen output to the PDP, and the screen output to the PDP. The determination threshold value SH may be set based on at least one piece of information of frame rate information indicating the frequency of updating the image and scanning method information indicating the scanning method of the screen output to the PDP. For example, the threshold setting unit 113 may set the determination threshold SH based on resolution information indicating the resolution of the screen output to the PDP.

  (D) In the present embodiment, the saver execution unit 115 moves the image displayed on the PDP as a screen saver in one direction (for example, left and right) up, down, left, and right by one pixel from the reference display position. However, the saver execution unit 115 may execute another method of screen saver. For example, the saver execution unit 115 may be a screen saver that temporarily lowers the luminance of pixels having high luminance among the pixels constituting the PDP.

  (E) In this embodiment, the case where the activation determination unit 114 determines whether to activate the screen saver based on the maximum value BM of the video bit rate has been described. It is also possible to determine whether to activate the screen saver based on the average value. Alternatively, the activation determination unit 114 may determine whether to activate the screen saver based on the video bit rate. In this case, the process is simplified.

These are block diagrams which show an example of a structure of the digital broadcast receiver which concerns on this invention. These are block diagrams which show an example of a structure of the principal part of the digital broadcast receiver shown in FIG. These are the figures which show an example of determination threshold value SH set by the threshold value setting part. These are the flowcharts which show an example of operation | movement of a digital broadcast receiver (mainly MPU).

Explanation of symbols

1 Digital broadcast receiver (broadcast receiver)
11 MPU
111 Information amount calculation unit (information amount calculation means)
112 Maximum value calculation unit (maximum value calculation means)
113 Threshold setting unit (threshold setting means)
114 Start determination unit (start determination unit)
115 Saver execution unit (saver execution means)
116 Elapsed time calculation unit (elapsed time calculation means)
117 Prohibited part (prohibited means)
15 Receiving Unit 18 Image Output Unit 183 PDP (FPD)

Claims (6)

A broadcast receiving device configured to receive a digital television broadcast and output to a PDP (Plasma Display Panel),
An information amount calculating means for obtaining a video bit rate that is an information amount of video included in a received TS (Transport Stream);
Maximum value calculating means for obtaining a maximum value within a predetermined period of the video bit rate obtained by the information amount calculating means;
Based on resolution information indicating the resolution of the screen output to the PDP, frame rate information indicating the frequency of updating the screen output to the PDP, and scanning method information indicating the scanning method of the screen output to the PDP. Threshold setting means for setting a determination threshold that is a threshold for determining whether or not to activate a screen saver that is a process for preventing the PDP from being burned;
An activation determination unit that determines whether to activate the screen saver based on whether or not the maximum value obtained by the maximum value calculation unit is equal to or less than a determination threshold set by the threshold setting unit;
Saver execution means for executing a screen saver when it is determined by the activation determination means to activate a screen saver;
An elapsed time calculating means for obtaining an elapsed time from the time when the screen saver is executed by the saver executing means;
Prohibiting means for prohibiting the saver executing means from starting the screen saver when the elapsed time obtained by the elapsed time calculating means is less than or equal to a predetermined time set in advance;
With
The saver executing means, as the screen saver, moves an image displayed on the PDP in at least one pixel from the reference display position in at least one direction, up, down, left, and right. A broadcast receiving device configured to receive digital television broadcast and output to an FPD (Flat Panel Display),
An information amount calculating means for obtaining a video bit rate that is an information amount of video included in a received TS (Transport Stream);
An activation determination unit that determines whether or not to activate a screen saver that is a process for preventing burn-in of the FPD, based on the video bit rate obtained by the information amount calculation unit;
Saver execution means for executing a screen saver when it is determined by the activation determination means to activate a screen saver;
Maximum value calculating means for obtaining a maximum value within a predetermined period of the video bit rate obtained by the information amount calculating means;
With
The broadcast determination apparatus , wherein the activation determination unit determines whether to activate the screen saver based on the maximum value obtained by the maximum value calculation unit . Resolution information indicating the resolution of the screen output to the FPD, frame rate information indicating the frequency of updating the screen output to the FPD, and scanning method information indicating the scanning method of the screen output to the FPD A threshold setting means for setting a determination threshold which is a threshold for determining whether to activate the screen saver based on the information of 1;
The activation determination unit determines whether to activate the screen saver based on whether the maximum value obtained by the maximum value calculation unit is equal to or less than a determination threshold set by the threshold setting unit. It broadcast receiving apparatus according to claim 2, characterized in that. An elapsed time calculating means for obtaining an elapsed time from the time when the screen saver is executed by the saver executing means;
Prohibiting means for prohibiting the saver executing means from starting the screen saver when the elapsed time obtained by the elapsed time calculating means is less than or equal to a predetermined time set in advance;
Broadcast receiving apparatus according to claim 2 or claim 3, characterized in that it comprises a. 3. The saver executing means , as the screen saver, moves an image displayed on the FPD in at least one direction, up, down, left, and right by at least one pixel from a reference display position . The broadcast receiving apparatus according to claim 4 . The FPD is the broadcast receiving apparatus according to any one of claims 2 to 5, characterized in that it consists of PDP (Plasma Display Panel).

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