US-12620368-B2 - Circuit apparatus and display system having different attenuation factor distributions of backlight source luminance

US12620368B2US 12620368 B2US12620368 B2US 12620368B2US-12620368-B2

Abstract

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.

Inventors

Sebdani Mahmood MAZROUEI
Kwok lap jimmy LAI
Kumar anandabairavasamy Anand

Assignees

SEIKO EPSON CORPORATION

Dates

Publication Date: 20260505
Application Date: 20240327
Priority Date: 20230328

Claims (20)

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.

Description

The present application is based on, and claims priority from JP Application Serial Number 2023-051048, filed Mar. 28, 2023, the disclosure of which is hereby incorporated by reference herein in its entirety. BACKGROUND 1. Technical Field The present disclosure relates to a circuit apparatus, a display system, and the like. 2. Related Art JP-T-2012-516458 discloses a backlight type display apparatus in which a drive value of an LED is changed to reduce a rapid backlight change in a dark area in order to avoid or reduce an artifact caused by a halo effect. JP-T-2012-516458 is an example of the related art. SUMMARY By reducing luminance of a light-emitting element that emits light to a display panel, halo caused by the light is reduced. However, since there is a trade-off between the reduction of halo and the reduction of luminance for illuminating the display panel, light adjustment may not be optimal for display contents, an environment, or the like. An aspect of the disclosure relates to a circuit apparatus that controls a display apparatus including a plurality of light source elements and a display panel, the circuit apparatus including: a storage unit 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 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, in which, 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, and, 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. Another aspect of the disclosure relates to a display system including the circuit apparatus and the display apparatus. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration example of an electronic device. FIG. 2 is a detailed configuration example of a circuit apparatus. FIG. 3 is an example of a look-up table LUTA. FIG. 4 is an example of an attenuation factor distribution in the look-up table LUTA. FIG. 5 is an example of a look-up table LUTB. FIG. 6 is an example of an attenuation factor distribution in the look-up table LUTB. FIG. 7 is an example of a look-up table LUTC. FIG. 8 is an example of an attenuation factor distribution in the look-up table LUTC. FIG. 9 is an example of a two-dimensional look-up table. FIG. 10 is a flow of processing performed by a light source luminance determination circuit. FIG. 11 is an example of surrounding light source elements. FIG. 12 is a flow of processing performed by an illumination luminance calculation circuit. DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of the disclosure will be described in detail. The embodiment described below does not unduly limit the contents of the claims, and not all of the configurations described in the embodiment are essential configuration requirements. 1. Electronic Device, Display System, and Circuit Apparatus FIG. 1 is a configuration example of an electronic device including a display system according to the embodiment. An electronic device 500 includes a processing apparatus 300 and a display system 400. The electronic device 500 is, for example, an in-vehicle display device including a meter panel, a center information display, a head-up display, or an electronic mirror, a television apparatus, or an information processing apparatus including a display. The display system 400 includes a circuit apparatus 100 and a display apparatus 200. The circuit apparatus 100 is, for example, an integrated circuit apparatus in which a plurality of circuit elements are integrated on a semiconductor substrate. The circuit apparatus 100 and the display apparatus 200 are shown as separate components in FIG. 1, and alternatively, the circuit apparatus 100 may be provided in the display apparatus 200. The display apparatus 200 includes a backlight 210, a display panel 220, a display driver 230, a light source driver 240, and a display controller 250. An example of the display apparatus 200 is a display used in a television apparatus, an information processing apparatus, or the like. Alternatively, the display apparatu