US-12620367-B2 - Circuit device and display system

US12620367B2US 12620367 B2US12620367 B2US 12620367B2US-12620367-B2

Abstract

A circuit device includes a luminance processing circuit and a color correction circuit. The luminance processing circuit computes lighting luminance information indicating luminance at which a target pixel of a display panel is illuminated by a plurality of light source elements, based on light source luminance information indicating luminance of light emitted by each of the plurality of light source elements and attenuation rate distribution information indicating an attenuation rate distribution of light with respect to a distance between each of the light source elements and each of pixels. The color correction circuit performs color correction on input image data based on the lighting luminance information. The luminance processing circuit computes the lighting luminance information by disabling light source luminance information of virtual light source positions where the plurality of light source elements are not arranged in a computing grid used for computation of the lighting luminance information.

Inventors

Stanislav ZAOZERSKII
Sebdani Mahmood MAZROUEI
Kumar anandabairavasamy Anand

Assignees

SEIKO EPSON CORPORATION

Dates

Publication Date: 20260505
Application Date: 20241127
Priority Date: 20231128

Claims (11)

1 . A circuit device that controls a display device including a plurality of light source elements and a display panel, the circuit device comprising: a luminance processing circuit that computes lighting luminance information indicating luminance at which a target pixel of the display panel is illuminated by the plurality of light source elements, based on light source luminance information indicating luminance of light emitted by each of the plurality of light source elements and attenuation rate distribution information indicating an attenuation rate distribution of light with respect to a distance between each of the light source elements and each of pixels; and a color correction circuit that performs color correction on input image data, based on the lighting luminance information, wherein the luminance processing circuit computes the lighting luminance information by disabling the light source luminance information of virtual light source positions where the plurality of light source elements are not arranged in a computing grid used for computation of the lighting luminance information.
2 . The circuit device according to claim 1 , further comprising a storage unit that stores grid identification information for identifying at least one of effective light source positions, at which the plurality of light source elements are arranged, and the virtual light source positions in the computing grid, wherein the luminance processing circuit disables the light source luminance information of the virtual light source positions, based on the grid identification information.
3 . The circuit device according to claim 2 , wherein the storage unit stores the grid identification information in which the effective light source positions or the virtual light source positions are identified for light source positions in the computing grid.
4 . The circuit device according to claim 2 , wherein the storage unit stores the grid identification information for designating any one preset from a plurality of presets in which the effective light source positions or the virtual light source positions are identified in advance for light source positions in the computing grid.
5 . The circuit device according to claim 1 , wherein the luminance processing circuit includes at least two modes of: an effective light source mode in which light source positions in the computing grid are set to effective light source positions at which the plurality of light source elements are arranged; a virtual light source mode in which the light source positions in the computing grid are set to the virtual light source positions; and a mixed mode in which the effective light source positions and the virtual light source positions are mixed in the computing grid.
6 . The circuit device according to claim 5 , wherein the luminance processing circuit sets a first mode, which is one of the at least two modes, for a first region in the computing grid, and sets a second mode, which is different from the first mode, of the at least two modes for a second region different from the first region in the computing grid.
7 . The circuit device according to claim 1 , wherein the computing grid is a grid in which light source positions are aligned at a first interval in a horizontal scanning direction and light source positions are aligned at a second interval in a vertical scanning direction.
8 . The circuit device according to claim 7 , wherein one of an odd-numbered column and an even-numbered column in an odd-numbered row and an other of an odd-numbered column and an even-numbered column in an even-numbered row are the virtual light source positions in the computing grid.
9 . The circuit device according to claim 1 , wherein the luminance processing circuit includes: a light source luminance determination circuit that disables the light source luminance information of the virtual light source positions in the computing grid and determines the light source luminance information, based on the input image data; and a lighting luminance computation circuit that computes the lighting luminance information, based on the light source luminance information, which is determined by the light source luminance determination circuit, and the attenuation rate distribution information.
10 . The circuit device according to claim 1 , wherein the luminance processing circuit computes the lighting luminance information by using the light source luminance information of s×t light source positions around the target pixel in the computing grid, each of s and t being an integer of 2 or more.
11 . A display system comprising: the circuit device according to claim 1 ; and the display device.

Description

The present application is based on, and claims priority from JP Application Serial Number 2023-200471, filed Nov. 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 device, a display system, and the like. 2. Related Art JP-A-2019-095559 discloses an image display device that performs local dimming. LEDs of a backlight are arranged in a matrix. The image display device includes an LED output value calculation unit, a display luminance calculation unit, and an LCD data calculation unit. The LED output value calculation unit calculates light-emission luminance data indicating luminance at the time of light emission of a light source corresponding to each area of an image. The display luminance calculation unit performs convolution processing on the light-emission luminance data using a point spread function or a luminance spread function to calculate spread luminance data. A linear interpolation unit performs linear interpolation processing on the spread luminance data to obtain display luminance data for each pixel. The LCD data calculation unit calculates a light transmittance of each pixel for each primary color based on the input image data and the display luminance data. In the local dimming, there is a problem in that luminance of the backlight can be calculated only when the light source elements of the backlight are arranged in a specific arrangement that is assumed in advance. In JP-A-2019-095559 described above, for example, it is assumed that LEDs of the backlight are arranged in a matrix form, and luminance calculation of the backlight in a case where the LEDs are arranged in a form other than the matrix form is not assumed. SUMMARY As aspect of the present disclosure relates to a circuit device that controls a display device including a plurality of light source elements and a display panel, the circuit device including: a luminance processing circuit that computes lighting luminance information indicating luminance at which a target pixel of the display panel is illuminated by the plurality of light source elements, based on light source luminance information indicating luminance of light emitted by each of the plurality of light source elements and attenuation rate distribution information indicating an attenuation rate distribution of light with respect to a distance between each of the light source elements and each of pixels; and a color correction circuit that performs color correction on input image data based on the lighting luminance information, the luminance processing circuit being configured to compute the lighting luminance information by disabling the light source luminance information of virtual light source positions where the plurality of light source elements are not arranged in a computing grid used for computation of the lighting luminance information. Another aspect of the present disclosure relates to a display system including the circuit device described above and the display device. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating an example of a configuration of an electronic apparatus. FIG. 2 is a diagram illustrating an example of a configuration of a circuit device. FIG. 3 is a diagram illustrating a first detailed configuration example of the circuit device. FIG. 4 is a diagram illustrating an example of a computing grid. FIG. 5 is a diagram illustrating an example in which all light source positions of the computing grid are effective light source positions. FIG. 6 is a diagram illustrating a first example of a case where some positions of the computing grid are virtual light source positions. FIG. 7 is a diagram illustrating a second example of a case where some positions of the computing grid are virtual light source positions. FIG. 8 is a diagram illustrating a third example of a case where some positions of the computing grid are virtual light source positions. FIG. 9 is a diagram illustrating an example of grid identification information designating presets. FIG. 10 is a diagram illustrating a second detailed configuration example of the circuit device. FIG. 11 is a flowchart of processing performed by a light source luminance determination circuit. FIG. 12 is a diagram illustrating an example of light source elements arranged at surrounding light source positions. FIG. 13 is a flowchart of processing performed by a lighting luminance computation circuit. DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of the present disclosure will be described in detail. It should be noted that the present embodiment described below is not intended to unduly limit the content described in the scope of claims, and all components described in the present embodiment are not necessarily essential requirements. 1. Electronic Apparatus, Display System, and Circuit Device FIG. 1 illustrates an example of a configuration of an electron