# US 12,002,395 B2 · Display apparatus and method of driving the same

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- Number: US 12,002,395 B2
- Document ID: US12002395B2
- Status: Granted
- Kind: B2
- Application number: 17/494,792
- Filed: 2021-10-05
- Published: 2022-06-30
- Granted: 2024-06-04
- Earliest claimed: 2020-12-14
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., LTD.
- Inventors: Seokha Hong
- Web page: https://patentgrep.com/patent/US12002395B2

## 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}
- G06F 3/1446: {display composed of modules, e.g. video walls}
- G06F 3/1423: {controlling a plurality of local displays, e.g. CRT and flat panel display}
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 2300/026: Video wall, i.e. juxtaposition of a plurality of screens to create a display screen of bigger dimensions
- G09G 2300/043: Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
- G09G 2310/0272: Details of drivers for data electrodes, the drivers communicating data to the pixels by means of a current
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0242: Compensation of deficiencies in the appearance of colours
- G09G 2320/0271: Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G 2330/021: Power management, e.g. power saving
- G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data
- 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)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A display apparatus includes a plurality of display panels, a current sensor, a driving controller and a data driver. The current sensor is configured to sense a current of each of the display panels. The driving controller is configured to generate a compensation value of each of the display panels based on the current of each of the display panels and to generate a data signal of each of the display panels based on the compensation value. The data driver is configured to convert the data signal into a data voltage and to output the data voltage to each of the display panels.

## Claims

### Claim 1

A display apparatus comprising:
a plurality of display panels;
a current sensor configured to sense a current of each of the display panels;
a driving controller configured to generate a compensation value of each of the display panels based on the current of each of the display panels and to generate a data signal of each of the display panels based on the compensation value;
a data driver configured to convert the data signal into a data voltage and to output the data voltage to each of the display panels;
a switch including a first end connected to the current sensor and a second end directly connected to the display panel to sense the current of the display panel;
a first power supply line configured to supply a power to a first display panel of the display panels;
a first switch connected to the first power supply line;
a second power supply line configured to supply a power to a second display panel of the display panels;
a second switch connected to the second power supply line;
a third power supply line configured to supply a power to a third display panel of the display panels;
a third switch connected to the third power supply line;
a fourth power supply line configured to supply a power to a fourth display panel of the display panels; and
a fourth switch connected to the fourth power supply line,
wherein the first switch, the second switch, the third switch and the fourth switch are turned on in a non-sensing period,
wherein the first switch is turned off and the second switch, the third switch and the fourth switch are turned on in a first duration of a sensing period,
wherein the second switch is turned off and the first switch, the third switch and the fourth switch are turned on in a second duration of the sensing period,
wherein the third switch is turned off and the first switch, the second switch and the fourth switch are turned on in a third duration of the sensing period,
wherein the fourth switch is turned off and the first switch, the second switch and the third switch are turned on in a fourth duration of the sensing period, and
wherein the first, second, third, and fourth durations of the sensing period are contiguous periods that abut each other such that a beginning of the second duration abuts an end of the first duration, a beginning of the third duration abuts an end of the second duration, and a beginning of the fourth duration abuts an end of the third duration.

### Claim 2 (depends on 1)

The display apparatus of claim 1, further comprising:
a first power supply line configured to supply a power to a first display panel of the display panels;
a first switch connected to the first power supply line;
a second power supply line configured to supply a power to a second display panel of the display panels; and
a second switch connected to the second power supply line.

### Claim 3 (depends on 2)

The display apparatus of claim 2, wherein the first switch and the second switch are turned on in a non-sensing period.

### Claim 4 (depends on 3)

The display apparatus of claim 3, wherein the first switch is turned off and the second switch is turned on in a first duration of a sensing period, and
wherein the first switch is turned on and the second switch is turned off in a second duration of the sensing period.

### Claim 5 (depends on 4)

The display apparatus of claim 4, wherein the display panels are driven in a unit of a frame,
wherein the frame includes an active period and a vertical blank period, and
wherein the sensing period is disposed in the vertical blank period.

### Claim 6 (depends on 2)

The display apparatus of claim 2, wherein the current sensor comprises:
a load connected to both ends of the first switch and both ends of the second switch.

### Claim 7 (depends on 1)

The display apparatus of claim 1, wherein the current sensor comprises:
a load connected to two ends of a power supply line configured to supply a power to the display panel; and
an analog to digital converter configured to convert an analog current signal received from the load to a digital current signal.

### Claim 8 (depends on 1)

The display apparatus of claim 1, wherein the driving controller comprises:
an image analyzer configured to analyze input image data to generate a target current;
a comparator configured to compare the target current and a sensed current of the current sensor to generate a compensation value; and
a compensator configured to generate the data signal based on the input image data and the compensation value.

### Claim 9 (depends on 8)

The display apparatus of claim 8, wherein the compensation value is a scale factor which is multiplied by a grayscale value of the input image data,
wherein when the sensed current is greater than the target current, the scale factor is set to be less than 1, and
wherein when the sensed current is less than the target current, the scale factor is set to be greater than 1.

### Claim 10 (depends on 1)

The display apparatus of claim 1, wherein each of the display panels comprises:
a plurality of display blocks,
wherein the current sensor is configured to sense a current of each of the display blocks, and
wherein the driving controller is configured to generate a compensation value of each of the display blocks based on the current of each of the display blocks.

### Claim 11 (depends on 1)

The display apparatus of claim 1, wherein the display apparatus comprises:
a plurality of the current sensors,
wherein the current sensors are connected to the display panels in a one-to-one correspondence, and
wherein a number of the current sensors is the same as a number of the display panels.

### Claim 12

A method of driving a display apparatus including a plurality of display panels, the method comprising:
sensing a current of each of the display panels;
generating a compensation value of each of the display panels based on the current of each of the display panels;
generating a data signal of each of the display panels based on the compensation value;
converting the data signal into a data voltage; and
outputting the data voltage to each of the display panels,
wherein the display apparatus further comprises:
a switch including a first end connected to a current sensor and a second end directly connected to the display panel to sense the current of the display panel;
a first power supply line configured to supply a power to a first display panel of the display panels;
a first switch connected to the first power supply line;
a second power supply line configured to supply a power to a second display panel of the display panels;
a second switch connected to the second power supply line;
a third power supply line configured to supply a power to a third display panel of the display panels;
a third switch connected to the third power supply line;
a fourth power supply line configured to supply a power to a fourth display panel of the display panels; and
a fourth switch connected to the fourth power supply line,
wherein the first switch, the second switch, the third switch and the fourth switch are turned on in a non-sensing period,
wherein the first switch is turned off and the second switch, the third switch and the fourth switch are turned on in a first duration of a sensing period,
wherein the second switch is turned off and the first switch, the third switch and the fourth switch are turned on in a second duration of the sensing period,
wherein the third switch is turned off and the first switch, the second switch and the fourth switch are turned on in a third duration of the sensing period, and
wherein the fourth switch is turned off and the first switch, the second switch and the third switch are turned on in a fourth duration of the sensing period, and
wherein the first, second, third, and fourth durations of the sensing period are contiguous periods that abut each other such that a beginning of the second duration abuts an end of the first duration, a beginning of the third duration abuts an end of the second duration, and a beginning of the fourth duration abuts an end of the third duration.

### Claim 13 (depends on 12)

The method of claim 12, wherein the display panels are driven in a unit of a frame,
wherein the frame includes an active period and a vertical blank period, and
wherein the sensing period is disposed in the vertical blank period.

### Claim 14 (depends on 12)

The method of claim 12, wherein the generating the compensation value comprises:
analyzing input image data to generate a target current; and
comparing the target current and the sensed current to generate the compensation value, and
wherein the data signal is generated based on the input image data and the compensation value.

### Claim 15 (depends on 14)

The method of claim 14, wherein the compensation value is a scale factor which is multiplied by a grayscale value of the input image data,
wherein when the sensed current is greater than the target current, the scale factor is set to be less than 1, and
wherein when the sensed current is less than the target current, the scale factor is set to be greater than 1.