# US 11,029,912 B2 · Display apparatus dividing the display into a plurality of regions and uniform light control method thereof

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- Number: US 11,029,912 B2
- Document ID: US11029912B2
- Status: Granted
- Kind: B2
- Application number: 16/715,724
- Filed: 2019-12-16
- Published: 2020-06-18
- Granted: 2021-06-08
- Earliest claimed: 2018-12-17
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Ji Yong Park; Young-Hoon Cho; Sang Kyun Im
- Web page: https://patentgrep.com/patent/US11029912B2

## CPC

- G06F 3/1446: {display composed of modules, e.g. video walls}
- G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)}
- G09G 3/2007: {Display of intermediate tones}
- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- G09G 5/14: Display of multiple viewports
- G09G 2300/026: Video wall, i.e. juxtaposition of a plurality of screens to create a display screen of bigger dimensions
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0271: Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G 2320/0276: for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
- G09G 2320/0285: using tables for spatial correction of display data
- G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve
- G09G 2320/0693: Calibration of display systems
- G09G 2354/00: Aspects of interface with display user
- G09G 2360/145: the light originating from the display screen
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- 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

Provided a display apparatus including a display including a plurality of display modules, each display module of the plurality of display modules including a pixel driving circuit and at least one pixel including a red inorganic light emitting element, a green inorganic light emitting element, and a blue inorganic light emitting element, a signal receiver configured to receive an image signal having a plurality of grayscales, and a controller configured to divide the display into a plurality of regions, each region of the plurality of regions having a same area and including at least one display module among the plurality of display modules, calibrate the image signal to output uniform light from each of the plurality of regions, and control the pixel driving circuit to display an image based on the calibrated image signal.

## Claims

### Claim 1

A display apparatus comprising:
a display comprising a plurality of display modules, each display module of the plurality of display modules comprising a pixel driving circuit and at least one pixel comprising a red inorganic light emitting element, a green inorganic light emitting element, and a blue inorganic light emitting element;
a signal receiver configured to receive an image signal having a plurality of grayscales; and
a controller configured to:
divide the display into a plurality of regions, each region of the plurality of regions having a same area and comprising at least one display module among the plurality of display modules,
calibrate the image signal to output uniform light from each of the plurality of regions, and
control the pixel driving circuit to display an image based on the calibrated image signal,
wherein the controller is further configured to determine a calibration coefficient for each grayscale corresponding to each of the plurality of display modules based on a reference calibration coefficient corresponding to each of the plurality of display modules, and calibrate the image signal by applying the determined calibration coefficient to the image signal based on each of the plurality of display modules,
wherein the reference calibration coefficient comprises a plurality of measurement calibration coefficients obtained based on a measurement of an image displayed on the display for a plurality of reference grayscales among the plurality of grayscales,
wherein the plurality of reference grayscales comprises at least one first grayscale selected from low grayscales lower than a first value and at least one second grayscale selected from high grayscales higher than a second value, and
wherein the controller is further configured to determine the determined calibration coefficient based on the reference calibration coefficient corresponding to a reference grayscale having a lowest grayscale included in a first grayscale section equal to or lower than the reference grayscale having the lowest grayscale.

### Claim 2 (depends on 1)

The display apparatus according to claim 1, wherein the controller is further configured to determine the reference calibration coefficient corresponding to each of the plurality of display modules based on a measurement of an image displayed in the plurality of regions of the display divided to have an area corresponding to one of the plurality of display modules.

### Claim 3 (depends on 1)

The display apparatus according to claim 1, wherein the controller is further configured to determine the reference calibration coefficient corresponding to the reference grayscale as the determined calibration coefficient for a grayscale section set by a user based on the reference grayscale.

### Claim 4 (depends on 1)

The display apparatus according to claim 1, wherein the controller is further configured to determine the determined calibration coefficient based on the reference calibration coefficient corresponding to a reference grayscale having a highest grayscale included in a second grayscale section equal to or higher than the reference grayscale having the highest grayscale and determine the determined calibration coefficient based on the reference calibration coefficient corresponding to each of the reference grayscales having grayscale sections therebetween for a grayscale section between the reference grayscales.

### Claim 5 (depends on 1)

The display apparatus according to claim 1, wherein the controller is further configured to:
identify a display module corresponding to a display module which is replaced among the plurality of display modules; and
calibrate a gamma value of the replaced display module based on a gamma calibration table corresponding to the identified display module or apply the determined calibration coefficient to an image signal corresponding to the replaced display module.

### Claim 6 (depends on 1)

The display apparatus according to claim 1, wherein the reference calibration coefficient corresponding to one of the plurality of display modules comprises a reference calibration coefficient corresponding to each of a plurality of regions having an area corresponding to a display module among the plurality of display modules.

### Claim 7 (depends on 6)

The display apparatus according to claim 6, wherein the controller is further configured to divide the display into a plurality of first regions based on an area corresponding to one of the plurality of display modules, determine a first calibration coefficient corresponding to each of the plurality of first regions based on a first reference calibration coefficient and a grayscale of each of the plurality of first regions, and calibrate the image signal by applying the determined first calibration coefficient to the image signal.

### Claim 8 (depends on 7)

The display apparatus according to claim 7, wherein the controller is further configured to divide the display into a plurality of second regions based on an area corresponding to another display module of the plurality of display modules, determine a second calibration coefficient corresponding to each of the plurality of second regions based on a second reference calibration coefficient and a grayscale of each of the plurality of second regions, and calibrate the image signal by applying the determined second calibration coefficient to an image signal to which the determined first calibration coefficient is applied.

### Claim 9

A control method of a display apparatus comprising a display comprising a plurality of display modules, each display module of the plurality of display modules comprising a pixel driving circuit and at least one pixel comprising a red inorganic light emitting element, a green inorganic light emitting element, and a blue inorganic light emitting element, the control method comprising:
receiving an image signal having a plurality of grayscales;
dividing a display region of the display into a plurality of regions, each region of the plurality of regions having a same area and comprising at least one display module among the plurality of display modules;
calibrating the image signal to output uniform light from each of the plurality of regions; and
controlling the pixel driving circuit to display an image based on the calibrated image signal,
wherein the calibrating the image signal comprises:
determining a calibration coefficient for each grayscale corresponding to each of the plurality of display modules based on a reference calibration coefficient corresponding to each of the plurality of display modules; and
calibrating the image signal by applying the determined calibration coefficient to the image signal based on each of the plurality of display modules,
wherein the reference calibration coefficient comprises a plurality of measurement calibration coefficients obtained based on a measurement of an image displayed on the display for a plurality of reference grayscales among the plurality of grayscales,
wherein the plurality of reference grayscales comprises at least one first grayscale selected from low grayscales lower than a first value and at least one second grayscale selected from high grayscales higher than a second value, and
wherein determining the calibration coefficient for each grayscale further comprises determining the determined calibration coefficient based on the reference calibration coefficient corresponding to a reference grayscale having a highest grayscale included in a second grayscale section equal to or higher than the reference grayscale having the highest grayscale.

### Claim 10 (depends on 9)

The control method according to claim 9, further comprising:
determining the reference calibration coefficient corresponding to each of the plurality of display modules based on a measurement of an image displayed in the plurality of regions of the display divided into an area corresponding to one of the plurality of display modules.

### Claim 11 (depends on 9)

The control method according to claim 9, wherein the determining the calibration coefficient for each grayscale comprises:
determining the reference calibration coefficient corresponding to a reference grayscale as the determined calibration coefficient for a grayscale section set by a user based on the reference grayscale; and
determining the determined calibration coefficient based on the reference calibration coefficient corresponding to the reference grayscale having a lowest grayscale included in a first grayscale section equal to or lower than the reference grayscale having the lowest grayscale.

### Claim 12 (depends on 9)

The control method according to claim 9, wherein the determining the calibration coefficient for each grayscale further comprises:
determining the determined calibration coefficient based on the reference calibration coefficient corresponding to each of the reference grayscales having grayscale sections therebetween for a grayscale section between the reference grayscales.

### Claim 13 (depends on 9)

The control method according to claim 9, further comprising:
identifying a display module corresponding to a display module which is replaced among the plurality of display modules; and
calibrating a gamma value of the replaced display module based on a gamma calibration table corresponding to the identified display module or applying the determined calibration coefficient to an image signal corresponding to the replaced display module.

### Claim 14 (depends on 9)

The control method according to claim 9, wherein the reference calibration coefficient corresponding to one of the plurality of display modules comprises a reference calibration coefficient corresponding to each of a plurality of regions of the display divided into an area corresponding to a display module among the plurality of display modules.

### Claim 15 (depends on 14)

The control method according to claim 14, wherein the calibrating the image signal comprises:
dividing the display region of the display into a plurality of first regions based on an area corresponding to one of the plurality of display modules;
determining a first calibration coefficient corresponding to each of the plurality of first regions based on a first reference calibration coefficient and a grayscale of each of the plurality of first regions; and
calibrating the image signal by applying the determined first calibration coefficient to the image signal.

### Claim 16 (depends on 15)

The control method according to claim 15, wherein the calibrating the image signal comprises:
dividing the display region of the display into a plurality of second regions based on an area corresponding to another display module of the plurality of display modules;
determining a second calibration coefficient corresponding to each of the plurality of second regions based on a second reference calibration coefficient and a grayscale corresponding to each of the plurality of second regions; and
calibrating the image signal by applying the determined second calibration coefficient to an image signal to which the determined first calibration coefficient is applied.