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公开(公告)号：EP4083984A1
公开(公告)日：2022-11-02
申请号：EP20906183.7
申请日：2020-09-30
发明人： MAEKAWA, Yusuke , UEHARA, Kazuhiro , YONEDA, Akira
摘要： A control device (110) that controls a liquid crystal display device (100), the control device includes: an obtainer (111) that obtains a first video signal; a determiner (122) that determines a first backlight value as a reference luminance of a backlight (105b) of the liquid crystal display device (100), using a first luminance characteristic of the first video signal; a tone map processor (123) that performs tone mapping on the first video signal based on the first backlight value and a peak luminance displayable by the liquid crystal display device (100), and outputs a second video signal obtained through the tone mapping; and a generator (113) that generates a control signal for local dimming control on the liquid crystal display device (100) based on the first backlight value and the second video signal, and outputs the control signal to the liquid crystal display device (100).
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公开(公告)号：EP3684061A1
公开(公告)日：2020-07-22
申请号：EP18855339.0
申请日：2018-02-26
发明人： HIROTA, Takeshi , MIYAJIMA, Susumu , YONEDA, Akira , KASHIWAGI, Yoshiichiro , NISHIO, Toshiroh , KOZUKA, Masayuki
摘要： A video display device (100) includes: a video receiver (110) that obtains video data including a video and dynamic luminance characteristics indicating a time-dependent change in luminance characteristics of the video; a tone mapping processor (120) that, in the case where a luminance region having a luminance less than or equal to a first luminance is defined as a low luminance region, and a luminance region having a luminance exceeding the first luminance is defined as a high luminance region, (i) performs first tone mapping using first conversion characteristics when first luminance characteristics exceed a predetermined threshold value, and (ii) performs second tone mapping using second conversion characteristics when the first luminance characteristics are less than or equal to the predetermined threshold value, the first luminance characteristics being included in the dynamic luminance characteristics and indicating the number of pixels having luminances less than or equal to a second luminance among pixels included in the low luminance region in one frame of the video, the first tone mapping maintaining the luminances less than or equal to the second luminance, the second tone mapping decreasing the luminances less than or equal to the second luminance; and a display (130) that displays a video obtained as a result of the first tone mapping or the second tone mapping.
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公开(公告)号：EP4220541A1
公开(公告)日：2023-08-02
申请号：EP23163831.3
申请日：2018-02-26
发明人： HIROTA, Takeshi , MIYAJIMA, Susumu , YONEDA, Akira , KASHIWAGI, Yoshiichiro , NISHIO, Toshiroh , KOZUKA, Masayuki
摘要： A luminance characteristics generation method includes: determining (S32), for each of frames included in a video, a value as first luminance characteristics, the value being obtained by dividing the number of pixels having luminances less than or equal to a first luminance among all pixels included in the frame by the number of all the pixels included in the frame; and outputting (S33) the first luminance characteristics determined in the determining of the value.
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公开(公告)号：EP3684063A1
公开(公告)日：2020-07-22
申请号：EP18857102.0
申请日：2018-02-26
发明人： HIROTA, Takeshi , MIYAJIMA, Susumu , YONEDA, Akira , KASHIWAGI, Yoshiichiro , NISHIO, Toshiroh , KOZUKA, Masayuki
摘要： A luminance characteristics generation method includes: determining (S32), for each of frames included in a video, a value as first luminance characteristics, the value being obtained by dividing the number of pixels having luminances less than or equal to a first luminance among all pixels included in the frame by the number of all the pixels included in the frame; and outputting (S33) the first luminance characteristics determined in the determining of the value.
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