# US 9,520,080 B2 · OLED display device compensating image decay

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- Number: US 9,520,080 B2
- Document ID: US9520080B2
- Status: Granted
- Kind: B2
- Application number: 14/860,793
- Filed: 2015-09-22
- Published: 2016-01-14
- Granted: 2016-12-13
- Earliest claimed: 2012-11-14
- Assignees: Shenzhen China Star Optoelectronics Technology Co., Ltd.
- Applicants: Shenzhen China Star Optoelectronics Technology Co., Ltd.
- Inventors: Tai-jiun Hwang
- Web page: https://patentgrep.com/patent/US9520080B2

## CPC

- G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED]
- 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 2320/043: Preventing or counteracting the effects of ageing
- G09G 2320/0693: Calibration of display systems
- G09G 2360/145: the light originating from the display screen
- 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)

## Abstract

An OLED display device includes a display screen, a sensor, and a timing controller. The timing controller includes a detection unit, a test image generation unit, a data compensation unit, and image control unit. The detection unit provides a command for generating a test image. The test image generation unit generates a test image according to the command. The data compensation unit receives a decayed signal that corresponds to the test image and is detected by the sensor in order to generate a compensation signal according to the decayed signal. In response to the compensation signal, the image control unit compensates an external image to achieve normal displaying of the external image on the display screen.

## Claims

### Claim 1

An organic light emitting diode (OLED) display device, which comprises: a display screen, a sensor, and a timing controller, wherein the display screen is configured to display an image and the sensor is configured to detect a decayed signal of the display screen when displaying;
wherein the timing controller comprises a detector, an external image receiver, a test image generator, a selector, a data compensator, and an image controller, the selector being connected to the detector, the external image receiver, and the test image generator and being also connected to the image controller;
wherein the detector is configured to provide a command for generating a test image;
the external image receiver is configured to receive an external image;
the test image generator is configured to generate a test image according to the command;
the selector is configured to select an input of the test image from the test image generator when receiving the command or to select an input of the external image from the external image receiver when not receiving the command, and then to feed the input to the image controller;
the image controller is configured to transmit the test image to the display screen for detecting decay of a display screen in response to the input of the test image; and
the data compensator is connected to the sensor and is configured to receive a decayed signal of the display screen detected by the sensor, the decayed signal corresponding to the test image transmitted from the image controller to the display screen, and to generate a compensation signal that is transmitted to the image controller; and
wherein when the image controller transmits the external image to the display screen, the external image is compensated according to the compensation signal so that the external image is displayed normally on the display screen.

### Claim 2 (depends on 1)

The OLED display device as claimed in claim 1, wherein the detector further comprises a power-on detection unit, and the power-on detection unit is configured to provide the command for generating a test image when the OLED display device is turned on.

### Claim 3 (depends on 2)

The OLED display device as claimed in claim 2, wherein the detector further comprises a timer unit and a storage unit that stores default time, the timer unit receiving the default time and providing the command for generating test image in response to the default time.

### Claim 4 (depends on 3)

The OLED display device as claimed in claim 3, wherein the detector further comprises an external activation unit, and the external activation unit is adapted to receive an instruction from a user and in response thereto, provides the command for generating a test image.

### Claim 5 (depends on 1)

The OLED display device as claimed in claim 1, wherein the decayed signal is one of a voltage signal and a current signal; and where the data compensator is loaded therein a standard voltage signal or a standard current signal corresponding to the test image before inputting to display screen, then after the test image inputted to display screen, uses the sensor to detect the decayed voltage signal or decayed current signal corresponding to the test image, and determines the value of compensation signal according to the difference between the standard voltage signal and decayed voltage signal or the difference between the standard current signal and the decayed current signal.

### Claim 6 (depends on 1)

The OLED display device as claimed in claim 1, wherein the image controller further comprises an image duration control unit, which controls a duration of each of frames of the external image transmitted to the display screen according to the compensation signal.

### Claim 7 (depends on 1)

The OLED display device as claimed in claim 1, wherein the image controller further comprises a voltage generation unit, which generates a control voltage corresponding to the external image according to the compensation signal and transmits the control signal to the display screen.