# US 2022/0044614 A1 · Flexible display apparatus and method of driving display panel using the same

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- Number: US 2022/0044614 A1
- Document ID: US20220044614A1
- Status: Published application
- Kind: A1
- Application number: 17/321,227
- Filed: 2021-05-14
- Published: 2022-02-10
- Earliest claimed: 2020-08-05
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: EUN SIL YUN; SANGAN KWON; SOON-DONG KIM; TAEHOON KIM; CHANGNOH YOON
- Web page: https://patentgrep.com/patent/US20220044614A1

## CPC

- G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)}
- G06F 1/1616: {with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position}
- G06F 1/1641: {the display being formed by a plurality of foldable display components (G06F1/1647 takes precedence)}
- G06F 1/1652: {the display being flexible, e.g. mimicking a sheet of paper, or rollable}
- G06F 1/1677: {for detecting open or closed state or particular intermediate positions assumed by movable parts of the enclosure, e.g. detection of display lid position with respect to main body in a laptop, detection of opening of the cover of battery compartment}
- G06F 1/3218: of display devices
- G06F 1/324: by lowering clock frequency
- G06F 1/3265: {Power saving in display device}
- G09G 3/035: {for flexible display surfaces}
- G09G 3/2007: {Display of intermediate tones}
- G09G 3/3291: in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
- G09G 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
- G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
- G09G 2320/0271: Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- 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 2320/0686: with two or more screen areas displaying information with different brightness or colours
- G09G 2320/103: Detection of image changes, e.g. determination of an index representative of the image change
- G09G 2330/021: Power management, e.g. power saving
- G09G 2340/0435: Change or adaptation of the frame rate of the video stream
- Y02D 10/00: Energy efficient computing, e.g. low power processors, power management or thermal management
- 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)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A flexible display apparatus includes a first body portion, a second body portion and a driving controller. The first body portion includes a first display area, and the second body portion includes a second display area. The second display area is connected to the first display area. The driving controller is configured to determine a first driving frequency of the first display area and a second driving frequency of the second display area based on a folded angle between the first body portion and the second body portion along a folded line disposed between the first body portion and the second body portion.

## Claims

### Claim 1

A flexible display apparatus comprising:
a first body portion including a first display area;
a second body portion including a second display area connected to the first display area; and
a driving controller configured to determine a first driving frequency of the first display area and a second driving frequency of the second display area based on a folded angle between the first body portion and the second body portion along a folded line disposed between the first body portion and the second body portion.

### Claim 2 (depends on 1)

The flexible display apparatus of claim 1, wherein when the folded angle is equal to or less than a threshold angle, the first driving frequency is different from the second driving frequency.

### Claim 3 (depends on 1)

The flexible display apparatus of claim 1, wherein when the folded angle is equal to or less than a threshold angle, and the second body portion contacts a ground, the first driving frequency is an input frequency of input image data, and the second driving frequency is a low driving frequency less than the input frequency.

### Claim 4 (depends on 1)

The flexible display apparatus of claim 1, wherein when the folded angle is greater than a threshold angle, the first driving frequency is equal to the second driving frequency.

### Claim 5 (depends on 1)

The flexible display apparatus of claim 1, wherein when the folded angle is greater than a threshold angle, the first driving frequency and the second driving frequency are an input frequency of input image data.

### Claim 6 (depends on 2)

The flexible display apparatus of claim 2, wherein the threshold angle is about 90 degrees.

### Claim 7 (depends on 1)

The flexible display apparatus of claim 1, wherein the driving controller comprises:
a static image determiner configured to determine whether input image data represents a static image or a moving image; and
a driving frequency determiner configured to determine the first driving frequency and the second driving frequency based on the folded angle and configured to determine whether the input image data represents the static image or the moving image.

### Claim 8 (depends on 7)

The flexible display apparatus of claim 7, wherein the driving controller further comprises a flicker value storage including a flicker value representing a flicker generating degree according to a grayscale value of the input image data, and
wherein the driving frequency determiner is configured to determine the first driving frequency and the second driving frequency based on the folded angle, the flicker value, and whether the input image data represents the static image or the moving image.

### Claim 9 (depends on 8)

The flexible display apparatus of claim 8, wherein the input image data is divided into a plurality of segments, and
wherein the driving frequency determiner is configured to determine the first driving frequency and the second driving frequency based on the folded angle, whether the input image data represents the static image or the moving image, the flicker value, and a segment information of the input image data.

### Claim 10 (depends on 9)

The flexible display apparatus of claim 9, wherein the driving frequency determiner is configured to determine optimal driving frequencies for the segments of the input image data, and
wherein the driving frequency determiner is configured to determine the first driving frequency and the second driving frequency based on a maximum driving frequency among the optimal driving frequencies for the segments.

### Claim 11 (depends on 8)

The flexible display apparatus of claim 8, wherein when the folded angle is equal to or less than a threshold angle, and the second body portion contacts the ground, the driving frequency determiner is configured to determine the first driving frequency based on whether a first input image data corresponding to the first display area represents the static image or the moving image and the flicker value of the first input image data and the second driving frequency as a predetermined low driving frequency.

### Claim 12 (depends on 8)

The flexible display apparatus of claim 8, wherein when the folded angle is greater than a threshold angle, the driving frequency determiner is configured to determine the first driving frequency based on whether first input image data corresponding to the first display area represent the static image or the moving image and the flicker value of the first input image data and the second driving frequency based on whether second input image data corresponding to the second display area represent the static image or the moving image and the flicker value of the second input image data.

### Claim 13 (depends on 1)

The flexible display apparatus of claim 1, further comprising a sensor configured to determine the folded angle between the first body portion and the second body portion and to determine whether the first body portion is closer to a ground than the second body portion, or the second body portion is closer to the ground than the first body portion.

### Claim 14 (depends on 13)

The flexible display apparatus of claim 13, further comprising a host configured to receive the folded angle and a proximity information representing whether the first body portion is closer to the ground than the second body portion, or the second body portion is closer to the ground than the first body portion from the sensor and configured to transmit the folded angle and the proximity information to the driving controller.

### Claim 15

A method of driving a display panel, the method comprising steps of:
determining a first driving frequency of a first display area and a second driving frequency of a second display area based on a folded angle of a first body portion including the first display area and a second body portion including the second display area connected to the first display area;
displaying a first image on the first display area in the first driving frequency; and
displaying a second image on the second display area in the second driving frequency.

### Claim 16 (depends on 15)

The method of claim 15, wherein, when the folded angle is equal to or less than a threshold angle, the first driving frequency is different from the second driving frequency.

### Claim 17 (depends on 15)

The method of claim 15, wherein, when the folded angle is equal to or less than a threshold angle, and the second body portion contacts a ground, the first driving frequency is an input frequency of input image data, and the second driving frequency is a low driving frequency less than the input frequency.

### Claim 18 (depends on 15)

The method of claim 15, wherein, when the folded angle is greater than a threshold angle, the first driving frequency is equal to the second driving frequency.

### Claim 19 (depends on 15)

The method of claim 15, wherein, when the folded angle is greater than a threshold angle, the first driving frequency and the second driving frequency are an input frequency of input image data.

### Claim 20 (depends on 16)

The method of claim 16, wherein the threshold angle is about 90 degrees.