# US 11,308,870 B2 · Organic light emitting display device and method of operating the same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,308,870 B2
- Document ID: US11308870B2
- Status: Granted
- Kind: B2
- Application number: 17/039,936
- Filed: 2020-09-30
- Published: 2021-01-21
- Granted: 2022-04-19
- Earliest claimed: 2017-05-24
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Jeongmin Sung; Woo-Chul Kim
- Web page: https://patentgrep.com/patent/US11308870B2

## CPC

- G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED]
- G09G 5/003: {Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto (specific for a CRT G09G1/165; for a flat panel G09G3/2092)}
- G09G 2300/0814: used for selection purposes, e.g. logical AND for partial update
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
- G09G 2310/0264: Details of driving circuits
- G09G 2340/04: Changes in size, position or resolution of an image
- G09G 2340/0435: Change or adaptation of the frame rate of the video stream
- G09G 2340/0442: Handling or displaying different aspect ratios, or changing the aspect ratio
- 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

An organic light emitting display device comprising: a source device configured to output image data; and a sink device configured to perform a displaying operation based on the image data, wherein the source device is configured to change a frame rate of an image frame composing the image data while the displaying operation is performed, wherein the sink device is configured to change a frame rate of a panel driving frame for the displaying operation as the frame rate of the image frame is changed, and wherein the source device is configured to change the frame rate of the image frame while satisfying a condition in which an emission duty ratio of the panel driving frame is not changed.

## Claims

### Claim 1

A method of operating an organic light emitting display device in which an organic light emitting diode included in a pixel circuit emits light in response to an emission on-off clock, the method comprising:
changing, while a displaying operation is performed, a frame rate of an image frame composing image data while satisfying a condition in which an emission duty ratio of a panel driving frame for the displaying operation is not changed; and
changing a frame rate of the panel driving frame as the frame rate of the image frame is changed such that a driving timing of the panel driving frame is synchronized with a transmission timing of the image frame.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
applying the emission on-off clock to the panel driving frame to display images corresponding to the image data.

### Claim 3 (depends on 2)

The method of claim 2, wherein one clock cycle time of the emission on-off clock is not changed when the frame rate of the image frame and the frame rate of the panel driving frame are changed.

### Claim 4 (depends on 3)

The method of claim 3, wherein the frame rate of the image frame is changed to control a time of the image frame to be equal to or longer than the one clock cycle time of the emission on-off clock.

### Claim 5 (depends on 4)

The method of claim 4, wherein the frame rate of the image frame is changed to control the time of the image frame to be an integer multiple of the one clock cycle time of the emission on-off clock.

### Claim 6 (depends on 3)

The method of claim 3, wherein the frame rate of the panel driving frame is increased as the frame rate of the image frame is increased, and
wherein the frame rate of the panel driving frame is decreased as the frame rate of the image frame is decreased.

### Claim 7 (depends on 6)

The method of claim 6, wherein the frame rate of the panel driving frame is changed to be equal to the frame rate of the image frame.

### Claim 8 (depends on 3)

The method of claim 3, wherein the frame rate of the image frame is changed according to characteristics of images that are displayed by the displaying operation.

### Claim 9 (depends on 8)

The method of claim 8, wherein the frame rate of the image frame is increased when a change of the images is faster than a predetermined reference speed.

### Claim 10 (depends on 8)

The method of claim 8, wherein the frame rate of the image frame is decreased when a change of the images is slower than a predetermined reference speed.

### Claim 11

A method of operating an organic light emitting display device in which an organic light emitting diode included in a pixel circuit emits light in response to an emission on-off clock, the method comprising: changing a frame rate of an image frame composing image data while a displaying operation is performed; and changing a frame rate of a panel driving frame for the displaying operation as the frame rate of the image frame is changed such that a driving timing of the panel driving frame is synchronized with a transmission timing of the image frame, wherein the frame rate of the image frame is changed using [Equation 1] as follows:
F
=
1
A
×
K
where F denotes the frame rate of the image frame, A denotes one clock cycle time of the emission on-off clock, and K is an integer greater than or equal to 1.

### Claim 12 (depends on 11)

The method of claim 11, wherein the frame rate of the image frame is changed by selecting one of a plurality of candidate frame rates of the image frame that are calculated by the [Equation 1] as the frame rate of the image frame.

### Claim 13 (depends on 11)

The method of claim 11, further comprising:
applying the emission on-off clock to the panel driving frame to display images corresponding to the image data.

### Claim 14 (depends on 13)

The method of claim 13, wherein the one clock cycle time of the emission on-off clock is not changed when the frame rate of the image frame and the frame rate of the panel driving frame are changed.

### Claim 15 (depends on 14)

The method of claim 14, wherein an emission duty ratio of the panel driving frame is not changed even when the frame rate of the panel driving frame is changed.

### Claim 16 (depends on 14)

The method of claim 14, wherein the frame rate of the panel driving frame is increased as the frame rate of the image frame is increased, and
wherein the frame rate of the panel driving frame is decreased as the frame rate of the image frame is decreased.

### Claim 17 (depends on 16)

The method of claim 16, wherein the frame rate of the panel driving frame is changed to be equal to the frame rate of the image frame.

### Claim 18 (depends on 14)

The method of claim 14, wherein the frame rate of the image frame is changed according to characteristics of images that are displayed by the displaying operation.

### Claim 19 (depends on 18)

The method of claim 18, wherein the frame rate of the image frame is increased when a change of the images is faster than a predetermined reference speed.

### Claim 20 (depends on 18)

The method of claim 18, wherein the frame rate of the image frame is decreased when a change of the images is slower than a predetermined reference speed.