# US 11,308,841 B2 · Display control device, display apparatus, non-transitory recording medium, and method for controlling display control device

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- Number: US 11,308,841 B2
- Document ID: US11308841B2
- Status: Granted
- Kind: B2
- Application number: 17/105,295
- Filed: 2020-11-25
- Published: 2021-06-17
- Granted: 2022-04-19
- Earliest claimed: 2019-12-13
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: Yuichi Sato; Yohichi Takazane
- Web page: https://patentgrep.com/patent/US11308841B2

## CPC

- G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters}
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
- G09G 2320/0653: Controlling or limiting the speed of brightness adjustment of the illumination source
- G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve
- G09G 2330/021: Power management, e.g. power saving
- G09G 2340/0435: Change or adaptation of the frame rate of the video stream
- G09G 2340/16: Determination of a pixel data signal depending on the signal applied in the previous frame
- G09G 2370/08: Details of image data interface between the display device controller and the data line driver circuit
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A host control unit is configured to set a transition interval between a first period for which an image is displayed at a first frame rate and a second period for which the image is displayed at a second frame rate different from the first frame rate, the transition interval being a period in which a frame rate is changed between the first frame rate and the second frame rate, and cause a display control unit to reduce a luminance difference of the image data in the transition interval, the luminance difference being caused when the frame rate is changed between the first frame rate and the second frame rate.

## Claims

### Claim 1

A display control device, for controlling a display apparatus including a display panel, comprising:
a host control unit configured to obtain or generate image data of an image to be displayed on the display panel; and
a display control unit configured to output, to the display panel, the image data transferred from the host control unit, wherein:
the host control unit is further configured to
set a transition interval between a first period for which the image is displayed at a first frame rate and a second period for which the image is displayed at a second frame rate different from the first frame rate, the image being displayed at the second frame rate in the transition interval, and
cause the display control unit to reduce a luminance difference of the image data in the transition interval, the luminance difference being caused when a frame rate is changed between the first frame rate and the second frame rate; and
when a duty cycle is a ratio of a pixel light emission time of the display panel to a display time of the image, the host control unit is further configured to set a value of a third duty cycle in the transition interval at a value different from both a value of a first duty cycle in the first period and a value of a second duty cycle in the second period to cause the display control unit to reduce the luminance difference of the image data.

### Claim 2 (depends on 1)

A display apparatus comprising the display control device according to claim 1.

### Claim 3 (depends on 1)

A computer-readable non-transitory recording medium storing a control program that causes a computer to function as the display control device according to claim 1, the control program comprising:
causing a computer to function as the host control unit and the display control unit.

### Claim 4

A display control device, for controlling a display apparatus including a display panel, comprising:
a host control unit configured to obtain or generate image data of an image to be displayed on the display panel; and
a display control unit configured to output, to the display panel, the image data transferred from the host control unit, wherein:
the host control unit is further configured to
set a transition interval between a first period for which the image is displayed at a first frame rate and a second period for which the image is displayed at a second frame rate different from the first frame rate, the image being displayed at the second frame rate in the transition interval, and
cause the display control unit to reduce a luminance difference of the image data in the transition interval, the luminance difference being caused when a frame rate is changed between the first frame rate and the second frame rate; and
when a gamma value is an index of brightness of the image data, the host control unit is further configured to set a third gamma value in the transition interval at a value different from both a first gamma value in the first period and a second gamma value in the second period to cause the display control unit to reduce the luminance difference of the image data.

### Claim 5 (depends on 4)

A display apparatus comprising the display control device according to claim 4.

### Claim 6 (depends on 4)

A computer-readable non-transitory recording medium storing a control program that causes a computer to function as the display control device according to claim 4, the control program comprising:
causing a computer to function as the host control unit and the display control unit.

### Claim 7

A method for controlling a display control device configured to control a display apparatus including a display panel, the display control device including a host control unit configured to obtain or generate image data of an image to be displayed on the display panel and a display control unit configured to output, to the display panel, the image data transferred from the host control unit, the method comprising:
causing the host control unit to set a transition interval between a first period for which the image is displayed at a first frame rate and a second period for which the image is displayed at a second frame rate different from the first frame rate, the image being displayed at the second frame rate in the transition interval; and
causing the display control unit to reduce a luminance difference of the image data in the transition interval, the luminance difference being caused when a frame rate is changed between the first frame rate and the second frame rate, wherein
when a duty cycle is a ratio of a pixel light emission time of the display panel to a display time of the image, the host control unit is further configured to set a value of a third duty cycle in the transition interval at a value different from both a value of a first duty cycle in the first period and a value of a second duty cycle in the second period to cause the display control unit to reduce the luminance difference of the image data.

### Claim 8

A method for controlling a display control device configured to control a display apparatus including a display panel, the display control device including a host control unit configured to obtain or generate image data of an image to be displayed on the display panel and a display control unit configured to output, to the display panel, the image data transferred from the host control unit, the method comprising:
causing the host control unit to set a transition interval between a first period for which the image is displayed at a first frame rate and a second period for which the image is displayed at a second frame rate different from the first frame rate, the image being displayed at the second frame rate in the transition interval; and
causing the display control unit to reduce a luminance difference of the image data in the transition interval, the luminance difference being caused when a frame rate is changed between the first frame rate and the second frame rate, wherein
when a gamma value is an index of brightness of the image data, the host control unit is further configured to set a third gamma value in the transition interval at a value different from both a first gamma value in the first period and a second gamma value in the second period to cause the display control unit to reduce the luminance difference of the image data.