Method for transmitting appropriate meta data to display device according to transmission protocol version

Abstract

A transmitting method according to one aspect of the present disclosure is a transmitting method of a playback device, and includes: when a version of a transmission protocol is a first version, transmitting first meta data to a display device without transmitting second meta data to the display device, the transmission protocol being used to transmit a signal between the playback device and the display device, the first meta data including information that is commonly used for a plurality of images included in a continuous playback unit of a first video signal and relates to a luminance range of the first video signal, and the second meta data including information that is commonly used for a unit subdivided compared to the continuous playback unit of the first video signal and relates to the luminance range of the first video signal; and when the version of the transmission protocol is a second version, transmitting the first meta data and the second meta data to the display device.

1 - 6 . (canceled) 
     
     
         7 . A playback method for playing back a video signal,
 a luminance of the video signal being a first luminance value in a first luminance range whose maximum luminance value is defined as a first maximum luminance value exceeding 100 nit,   the playback method comprising:   determining whether or not an inter-screen change amount of a luminance value of the video signal exceeds a predetermined first threshold; and   adjusting the luminance value of the video signal when it is determined that the change amount exceeds the first threshold.   
     
     
         8 . The playback method according to  claim 7 , wherein the adjustment includes adjusting, for a pixel whose change amount exceeds the first threshold, a luminance value of the pixel such that the change amount of the pixel is the first threshold or less. 
     
     
         9 . The playback method according to  claim 7 , wherein
 the determination includes determining whether or not a difference exceeds the first threshold, the difference being a difference between a peak luminance of a first image included in the video signal, and each of luminance values of a plurality of pixels included in the video signal and included in a second image subsequent to the first image, and   the adjustment includes adjusting, for a pixel the difference of which exceeds the first threshold, a luminance value of the pixel such that the difference of the pixel is the first threshold or less.   
     
     
         10 . The playback method according to  claim 7 , wherein
 the determination includes determining whether or not the change amount of the luminance value at a reference time interval exceeds the first threshold, the reference time interval being an integer multiple of a reciprocal of a frame rate of the video signal.   
     
     
         11 . The playback method according to  claim 7 , wherein
 the determination includes determining whether or not a rate of pixels the change amounts of which exceed the first threshold with respect to a plurality of pixels exceeds a second threshold, the plurality of pixels being included in an image included in the video signal, and   the adjustment includes adjusting, when the rate exceeds the second threshold, the luminance values of a plurality of pixels such that the rate is the second threshold or less.   
     
     
         12 . The playback method according to  claim 7 , wherein
 the determination includes determining, for each of a plurality of areas obtained by dividing a screen, whether or not the inter-screen change amount of the luminance value of each of a plurality of areas exceeds the first threshold, and   the adjustment includes performing, an adjustment process of lowering a luminance value of an area for which it is determined that the change amount exceeds the first threshold.   
     
     
         13 . A playback method for playing back a video signal,
 a luminance of the video signal being a first luminance value in a first luminance range whose maximum luminance value is defined as a first maximum luminance value exceeding 100 nit,   the playback method comprising:   determining whether or not a luminance value of an image of the video signal exceeds a predetermined first threshold; and   adjusting the luminance value of the image when it is determined that the luminance value exceeds the first threshold.   
     
     
         14 . The playback method according to  claim 13 , wherein
 the determination includes determining a number of pixels whose luminance values exceed the first threshold with respect to a plurality of pixels included in the image, and   the adjustment includes lowering, when the number of pixels exceeds a third thresholds, the luminance value of the image such that the number of pixels is the third threshold or less.   
     
     
         15 . The playback method according to  claim 13 , wherein
 the determination includes determining, a rate of pixels whose luminance values exceed the first threshold with respect to a plurality of pixels included in the image, and   the adjustment includes lowering, when the rate exceeds a third threshold, the luminance value of the image such that the rate is the third threshold or less.   
     
     
         16 . The playback method according to  claim 13 , wherein
 the first threshold is a value calculated based on an upper limit value of a voltage which is simultaneously applicable to a plurality of pixels in a display device that displays the video signal.   
     
     
         17 . (canceled) 
     
     
         18 . A playback device that plays back a video signal,
 a luminance of the video signal being a first luminance value in a first luminance range whose maximum luminance value is defined as a first maximum luminance value exceeding 100 nit,   the playback device comprising one or more memories and circuitry which, in operation,   determines whether or not an inter-screen change amount of a luminance value of the video signal exceeds a predetermined first threshold; and   adjusts the luminance value of the video signal when it is determined that the change amount exceeds the first threshold.   
     
     
         19 . A playback device that plays back a video signal, wherein
 a luminance of the video signal is a first luminance value in a first luminance range whose maximum luminance value is defined as a first maximum luminance value exceeding 100 nit, and   the playback device comprises one or more memories and circuitry which, in operation, and   the playback device determines whether or not a luminance value of an image included in the video signal exceeds a predetermined first threshold, and   adjusts the luminance value of the image when it is determined that the luminance value exceeds the first threshold.   
     
     
         20 . A display method for displaying a video signal,
 a luminance of the video signal being a first luminance value in a first luminance range whose maximum luminance value is defined as a first maximum luminance value exceeding 100 nit,   the playback method comprising:   determining whether or not a luminance value of an image of the video signal exceeds a predetermined first threshold;   adjusting the luminance value of the image when it is determined that the luminance value exceeds the first threshold; and   displaying a signal adjusted in the adjusting.   
     
     
         21 . A display method for displaying a video signal,
 a luminance of the video signal being a first luminance value in a first luminance range whose maximum luminance value is defined as a first maximum luminance value exceeding 100 nit,   the display method comprising:   determining whether or not an inter-screen change amount of a luminance value of the video signal exceeds a predetermined first threshold;   adjusting the luminance value of the video signal when it is determined that the change amount exceeds the first threshold; and   displaying a signal adjusted in the adjusting.   
     
     
         22 . A display device that displays back a video signal, a luminance of the video signal is a first luminance value in a first luminance range whose maximum luminance value is defined as a first maximum luminance value exceeding 100 nit, the display device comprising:
 a display; and   circuitry that, in operation, performs operations including:
 determining whether or not a luminance value of an image included in the video signal exceeds a predetermined first threshold; 
 adjusting the luminance value of the image when it is determined that the luminance value exceeds the first threshold; and 
 displaying a signal on the display adjusted in the adjusting. 
   
     
     
         23 . A playback device that plays back a video signal, a luminance of the video signal being a first luminance value in a first luminance range whose maximum luminance value is defined as a first maximum luminance value exceeding 100 nit, the display device comprising:
 a display; and   circuitry that, in operation, performs operations including:
 determining whether or not an inter-screen change amount of a luminance value of the video signal exceeds a predetermined first threshold; 
 adjusting the luminance value of the video signal when it is determined that the change amount exceeds the first threshold; 
 displaying a signal on the display adjusted in the adjusting.