Circuit apparatus and display system having different attenuation factor distributions of backlight source luminance
A circuit apparatus includes a storage unit and a light source luminance determination circuit. The storage unit stores a plurality of pieces of attenuation factor distribution information indicating an attenuation factor distribution of light with respect to a distance between a light source element and a pixel. The light source luminance determination circuit determines, by light adjustment processing based on input image data and the plurality of pieces of attenuation factor distribution information, light source luminance information indicating luminance of light emitted by each light source element of a plurality of light source elements. In a first mode, the light source luminance determination circuit determines the light source luminance information based on the input image data and first attenuation factor distribution information among the plurality of pieces of attenuation factor distribution information. In a second mode, the light source luminance determination circuit determines the light source luminance information based on the input image data and second attenuation factor distribution information in which the attenuation factor distribution is different from that in the first attenuation factor distribution information among the plurality of pieces of attenuation factor distribution information.
1 . A circuit apparatus that controls a display apparatus including a plurality of light source elements and a display panel, the circuit apparatus comprising:
a memory configured to store a plurality of pieces of attenuation factor distribution information indicating an attenuation factor distribution of light with respect to a distance between each of the plurality of light source elements and a pixel; and
a light source luminance determination circuit configured to determine, by light adjustment processing based on input image data and the plurality of pieces of attenuation factor distribution information, light source luminance information indicating luminance of light emitted by each light source element of the plurality of light source elements, wherein
in a first mode, the light source luminance determination circuit determines the light source luminance information based on the input image data and first attenuation factor distribution information among the plurality of pieces of attenuation factor distribution information,
in a second mode, the light source luminance determination circuit determines the light source luminance information based on the input image data and second attenuation factor distribution information in which the attenuation factor distribution is different from that in the first attenuation factor distribution information among the plurality of pieces of attenuation factor distribution information,
the first mode is a high luminance mode in which display is performed with higher luminance than that in the second mode,
the second mode is a halo reduction mode in which occurrence of halo is reduced as compared to the first mode, and
the attenuation factor distribution in the second attenuation factor distribution information has a higher degree of attenuation of light with respect to the distance than the attenuation factor distribution in the first attenuation factor distribution information.
2 . The circuit apparatus according to claim 1 , wherein
the first attenuation factor distribution information is a first look-up table to which the distance is input, and
the second attenuation factor distribution information is a second look-up table to which the distance is input.
3 . The circuit apparatus according to claim 1 , wherein
the first mode and the second mode are modes set according to ambient luminance.
4 . The circuit apparatus according to claim 1 , wherein
the first mode is set in a first area of the display panel, and
the second mode is set in a second area different from the first area of the display panel.
5 . The circuit apparatus according to claim 1 , further comprising:
an illumination luminance calculation circuit configured to calculate, based on attenuation factor distribution information for illumination luminance calculation among the plurality of pieces of attenuation factor distribution information and the light source luminance information determined by the light source luminance determination circuit, illumination luminance information indicating luminance at which a target pixel of the display panel is illuminated by the plurality of light source elements; and
a color correction circuit configured to perform color correction on the input image data based on the illumination luminance information.
6 . The circuit apparatus according to claim 1 , wherein
in a third mode, the light source luminance determination circuit determines the light source luminance information based on the input image data and third attenuation factor distribution information in which the attenuation factor distribution is different from those in the first attenuation factor distribution information and the second attenuation factor distribution information among the plurality of pieces of attenuation factor distribution information.
7 . The circuit apparatus according to claim 1 , wherein
the display apparatus is a head-up display, a meter panel, a center information display, or an electronic mirror.
8 . A display system comprising:
the circuit apparatus according to claim 1 ; and
the display apparatus.
9 . The circuit apparatus according to claim 1 , wherein
the light source luminance determination circuit obtains, based on a pixel value of a target pixel in the input image data and previous light source luminance information, a required change amount of luminance for illuminating the target pixel of the display panel,
in the first mode, the light source luminance determination circuit obtains current light source luminance information by updating the previous light source luminance information based on the required change amount of luminance and the first attenuation factor distribution information, and
in the second mode, the light source luminance determination circuit obtains the current light source luminance information by updating the previous light source luminance information based on the required change amount of luminance and the second attenuation factor distribution information.
10 . The circuit apparatus according to claim 9 , wherein
in the first mode, the light source luminance determination circuit distributes the required change amount of luminance to surrounding light source elements, which are light source elements disposed around the target pixel, by weighting based on the first attenuation factor distribution information, thereby updating light source luminance of the surrounding light source elements, and
in the second mode, the light source luminance determination circuit distributes the required change amount of luminance to the surrounding light source elements by weighting based on the second attenuation factor distribution information, thereby updating the light source luminance of the surrounding light source elements.
11 . The circuit apparatus according to claim 9 , wherein
when the required change amount of luminance is zero or negative, the light source luminance determination circuit sets the previous light source luminance information as the current light source luminance information without updating.
12 . The circuit apparatus according to claim 9 , wherein
the light source luminance determination circuit obtains, based on the previous light source luminance information relative to n×m light source elements disposed around the target pixel, the current light source luminance information relative to the n×m light source elements.
13 . A circuit apparatus that controls a display apparatus including a plurality of light source elements and a display panel, the circuit apparatus comprising:
a memory configured to store a plurality of pieces of attenuation factor distribution information indicating an attenuation factor distribution of light with respect to a distance between each of the plurality of light source elements and a pixel; and
a light source luminance determination circuit configured to determine, by light adjustment processing based on input image data and the plurality of pieces of attenuation factor distribution information, light source luminance information indicating luminance of light emitted by each light source element of the plurality of light source elements, wherein
in a first mode, the light source luminance determination circuit determines the light source luminance information based on the input image data and first attenuation factor distribution information among the plurality of pieces of attenuation factor distribution information,
in a second mode, the light source luminance determination circuit determines the light source luminance information based on the input image data and second attenuation factor distribution information in which the attenuation factor distribution is different from that in the first attenuation factor distribution information among the plurality of pieces of attenuation factor distribution information,
the light source luminance determination circuit obtains, based on a pixel value of a target pixel in the input image data and previous light source luminance information, a required change amount of luminance for illuminating the target pixel of the display panel,
in the first mode, the light source luminance determination circuit obtains current light source luminance information by updating the previous light source luminance information based on the required change amount of luminance and the first attenuation factor distribution information, and
in the second mode, the light source luminance determination circuit obtains the current light source luminance information by updating the previous light source luminance information based on the required change amount of luminance and the second attenuation factor distribution information.
14 . The circuit apparatus according to claim 13 , wherein
in the first mode, the light source luminance determination circuit distributes the required change amount of luminance to surrounding light source elements, which are light source elements disposed around the target pixel, by weighting based on the first attenuation factor distribution information, thereby updating light source luminance of the surrounding light source elements, and
in the second mode, the light source luminance determination circuit distributes the required change amount of luminance to the surrounding light source elements by weighting based on the second attenuation factor distribution information, thereby updating the light source luminance of the surrounding light source elements.
15 . The circuit apparatus according to claim 13 , wherein
when the required change amount of luminance is zero or negative, the light source luminance determination circuit sets the previous light source luminance information as the current light source luminance information without updating.
16 . The circuit apparatus according to claim 13 , wherein
the light source luminance determination circuit obtains, based on the previous light source luminance information relative to n×m light source elements disposed around the target pixel, the current light source luminance information relative to the n×m light source elements.
17 . The circuit apparatus according to claim 13 , wherein
the first attenuation factor distribution information is a first look-up table to which the distance is input, and
the second attenuation factor distribution information is a second look-up table to which the distance is input.
18 . The circuit apparatus according to claim 13 , wherein
the first mode and the second mode are modes set according to ambient luminance.
19 . The circuit apparatus according to claim 13 , wherein
the first mode is set in a first area of the display panel, and
the second mode is set in a second area different from the first area of the display panel.
20 . The circuit apparatus according to claim 13 , wherein
the display apparatus is a head-up display, a meter panel, a center information display, or an electronic mirror.