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公开(公告)号：US20170336676A1
公开(公告)日：2017-11-23
申请号：US15595696
申请日：2017-05-15
Applicant: Japan Display Inc.
Inventor： Tsutomu Harada , Kazuhiko Sako , Tae Kurokawa
IPC: G02F1/1335 , G09G3/34 , G09G3/20 , G09G3/36
CPC classification number: G02F1/133602 , G09G3/2022 , G09G3/3413 , G09G3/342 , G09G3/3607 , G09G3/3666 , G09G2310/0232 , G09G2320/0238 , G09G2320/0285 , G09G2320/0646 , G09G2360/16
Abstract: According to an aspect, a display apparatus includes: an image display panel that displays an image thereon; a planar light source that includes a plurality of light sources and irradiates a plurality of divided areas of the image display panel with light from the back side of the image display panel; and a signal processor that drives the light sources individually based on input signals of the image to control brightness of the individual divided areas. The signal processor performs image display on the image display panel using output signals obtained by lowering brightness of a dark region in the image represented by the input signals.
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公开(公告)号：US20170270846A1
公开(公告)日：2017-09-21
申请号：US15442995
申请日：2017-02-27
Applicant: Japan Display Inc.
Inventor： Tadafumi OZAKI , Kazuhiko Sako , Tsutomu Harada , Naoyuki Takasaki
IPC: G09G3/20
CPC classification number: G09G3/2059 , G09G2320/0247
Abstract: An image display device includes a first pixel data calculator calculating first pixel data for a pixel of attention based on a first error value for a pixel adjacent thereto in the same error diffusion block; a second pixel data calculator calculating second pixel data for the pixel of attention based on a corrected error value for the adjacent pixel; a first error value calculator calculating the first error value based on the first pixel data; a second error value calculator calculating a second error value based on the second pixel data; and a corrected error value calculator calculating the corrected error value by correcting the second error value in a direction in which the second error value approaches the first error value in accordance with whether the pixel of attention is located within a predetermined range from a border among a plurality of error diffusion blocks.
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公开(公告)号：US12236910B2
公开(公告)日：2025-02-25
申请号：US18521650
申请日：2023-11-28
Applicant: Japan Display Inc.
Inventor： Kazuhiko Sako , Yoshihiro Watanabe , Tomoyuki Ishihara
Abstract: A display device includes a display panel comprising a display region for displaying an image, a light source device comprising a plurality of light sources configured to emit light toward the display panel, and a drive circuit configured to drive the display panel based on an image signal including information on the image.
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公开(公告)号：US10957261B2
公开(公告)日：2021-03-23
申请号：US16248232
申请日：2019-01-15
Applicant: Japan Display Inc.
Inventor： Kazuhiko Sako , Tsutomu Harada , Naoyuki Takasaki , Toshiyuki Nagatsuma
Abstract: According to an aspect, a display device includes a display unit including a plurality of pixels, a light source device that emits light that illuminates the display unit, and a controller that controls operation of the light source device. The controller does not lower luminance of the light for a second predetermined time or longer after the controller has raised the luminance of the light by a predetermined amount of luminance change or more within a first predetermined time.
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公开(公告)号：US10770008B2
公开(公告)日：2020-09-08
申请号：US16039440
申请日：2018-07-19
Applicant: Japan Display Inc.
Inventor： Kazuhiko Sako , Daichi Suzuki , Naoyuki Takasaki , Tsutomu Harada , Kojiro Ikeda
Abstract: According to an aspect, a display device includes a display panel comprising a plurality of pixels, a light guide plate, a light source configured to emit light from a lateral side of the light guide plate, a dimming panel, and a controller. The dimming panel comprises a plurality of dimming areas arranged in an emission direction of the light from the light source. The dimming areas are capable of individually changing transmittance of the light according to intensities of light required to display an image using the display panel. When adjacent two of the dimming areas differ in light transmittance from each other, the controller increases output gradation values of target pixels, the target pixels being located in a predetermined area extending from a boundary between the two dimming areas in one of the two dimming areas that has lower light transmittance.
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Patent Agency Ranking
公开(公告)号：US10373572B2
公开(公告)日：2019-08-06
申请号：US15016341
申请日：2016-02-05
Applicant: Japan Display Inc.
Inventor： Kazuhiko Sako , Naoyuki Takasaki , Tsutomu Harada
Abstract: A display device includes an image display panel, a light source unit, and a signal processing unit. The tentative expansion coefficient calculating unit calculates a tentative expansion coefficient. The tentative index value calculating unit calculates a tentative index value serving as an index of the irradiation amount of light based on the tentative expansion coefficient. The low-saturation pixel detecting unit detects low-saturation pixels in a certain region on an image display surface. The light irradiation amount calculating unit calculates a comparative light irradiation amount based on a detection by the low-saturation pixel detecting unit, a display quality maintenance reference value at which the display quality of colors displayed by the low-saturation pixels is maintained, and an index value calculated based on the tentative index value and calculates, based on the comparative light irradiation amount, a light irradiation amount serving as the irradiation amount of light.
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公开(公告)号：US10297231B2
公开(公告)日：2019-05-21
申请号：US15677326
申请日：2017-08-15
Applicant: Japan Display Inc.
Inventor： Kazuhiko Sako , Kazunari Tomizawa , Tsutomu Harada , Naoyuki Takasaki , Tae Kurokawa
IPC: G09G5/10 , G06T5/00 , G09G3/34 , G09G3/36 , G09G3/3208
Abstract: According to an aspect, a display apparatus includes: an image display panel including a plurality of pixels and displaying an image; and a signal processor generating a second signal by multiplying signal values for a plurality of sub-pixels making up each of the plurality of pixels by a gain, the signal values being included in a first signal that is an input signal of the image. The the signal processor calculates a luminance of each of the plurality of pixels based on the signal values of the sub-pixels included in the respective pixels. The signal processor increases the gain by which the signal values of the sub-pixels of the pixel having a luminance greater than a first luminance threshold are multiplied, in accordance with the luminance of the corresponding pixel.
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公开(公告)号：US10297212B2
公开(公告)日：2019-05-21
申请号：US14667981
申请日：2015-03-25
Applicant: Japan Display Inc.
Inventor： Kazuhiko Sako , Tsutomu Harada
Abstract: A display device includes an image display panel on which pixels are arranged, a backlight which lights the image display panel from a rear of the image display panel, a first device which controls the backlight, and a second device which controls the image display panel. The first device generates an image signal, outputs the image signal to the second device, determines a light source lighting amount of the backlight on the basis of the image signal by blocks obtained by dividing a display surface of the image display panel and luminance distribution information on the backlight stored in advance, and controls the backlight by the light source lighting amount. The second device acquires the image signal, converts the image signal to a display signal for controlling display of the image display panel, and controls the image display panel.
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公开(公告)号：US10139675B2
公开(公告)日：2018-11-27
申请号：US15595696
申请日：2017-05-15
Applicant: Japan Display Inc.
Inventor： Tsutomu Harada , Kazuhiko Sako , Tae Kurokawa
IPC: G02F1/1335 , G09G3/20 , G09G3/34 , G09G3/36
Abstract: According to an aspect, a display apparatus includes: an image display panel that displays an image thereon; a planar light source that includes a plurality of light sources and irradiates a plurality of divided areas of the image display panel with light from the back side of the image display panel; and a signal processor that drives the light sources individually based on input signals of the image to control brightness of the individual divided areas. The signal processor performs image display on the image display panel using output signals obtained by lowering brightness of a dark region in the image represented by the input signals.
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公开(公告)号：US10032418B2
公开(公告)日：2018-07-24
申请号：US15583146
申请日：2017-05-01
Applicant: Japan Display Inc.
Inventor： Kazuhiko Sako , Naoyuki Takasaki , Tsutomu Harada , Tatsuya Yata , Shigenori Aoki
Abstract: According to an aspect, a display apparatus includes: a plurality of light sources; a display device that includes a display area provided with n1 pixels and that is irradiated with light from the light sources; a light source controller controlling an operation of the light sources; and a display controller controlling an output gradation value of part or all of the pixels. The display area includes a plurality of partial areas, the partial areas corresponding to the light sources on a one-to-one basis. The light source controller determines the amount of light emitted from each light source corresponding to a corresponding one of the partial areas based on luminance of light required for the corresponding partial area. The display controller performs first correction and second correction when the amounts of light emitted from two light sources corresponding to two adjacent partial areas are different.
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