# US 10,311,788 B2 · Organic light-emitting display and driving method thereof

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- Number: US 10,311,788 B2
- Document ID: US10311788B2
- Status: Granted
- Kind: B2
- Application number: 15/816,553
- Filed: 2017-11-17
- Published: 2018-05-31
- Granted: 2019-06-04
- Earliest claimed: 2016-11-29
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Myunggi Lim; Kyoungdon Woo; Jaeyoon Bae
- Web page: https://patentgrep.com/patent/US10311788B2

## CPC

- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 3/2081: {with combination of amplitude modulation and time modulation (space and time error diffusion G09G3/2066)}
- 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 2310/0251: Precharge or discharge of pixel before applying new pixel voltage
- G09G 2310/0262: The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
- G09G 2320/0238: Improving the black level
- G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
- G09G 2320/0252: Improving the response speed
- G09G 2320/0261: in the context of movement of objects on the screen or movement of the observer relative to the screen
- G09G 2320/0271: Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G 2320/0295: by monitoring each display pixel
- 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 organic light-emitting display includes a driving transistor that drives an organic light-emitting diode, a first transistor connected between a data line supplying a data voltage and a gate electrode of the driving transistor, a second transistor connected between a reference voltage input line and a source electrode of the driving transistor, and a third transistor that directly charges the gate electrode of the driving transistor with a reference voltage supplied from the reference voltage input line, in response to a black data control signal, wherein the third transistor directly receives the reference voltage by being turned on for a certain period of time after the gate electrode of the driving transistor is programmed with the data voltage in one frame before receiving a data voltage in the next frame.

## Claims

### Claim 1

An organic light-emitting display comprising:
pixels arranged on a first pixel line to an nth pixel line, where n is a natural number,
wherein each of the pixels includes:
a driving transistor that drives an organic light-emitting diode;
a first transistor connected between a data line supplying a data voltage and a gate electrode of the driving transistor, and turned on according to a scan signal;
a second transistor connected between a reference voltage input line and a source electrode of the driving transistor; and
a third transistor that directly charges the gate electrode of the driving transistor with a reference voltage supplied from the reference voltage input line, in response to a black data control signal,
wherein the black data control signal is sequentially applied to the first pixel line to the nth pixel lines later than the scan signal, and
wherein an interval between the scan signal and the black data control signal is the same in all pixel lines among the first pixel line to the nth pixel line.

### Claim 2 (depends on 1)

The organic light-emitting display of claim 1, wherein the source electrode of the driving transistor is connected to an anode of the organic light-emitting diode, and the reference voltage supplied from the reference voltage input line is reset to keep the organic light-emitting diode turned off.

### Claim 3 (depends on 2)

The organic light-emitting display of claim 2, wherein the first transistor of each pixel on each pixel line is turned on in response to the scan signal during a programming period to charge the gate electrode of the driving transistor with the data voltage, and the pixels arranged on the first pixel line to the nth pixel line are sequentially supplied with the scan signal, where n is a natural number.

### Claim 4 (depends on 3)

The organic light-emitting display of claim 3, wherein the second transistor is turned on in synchronization with the first transistor during the programming period.

### Claim 5 (depends on 1)

The organic light-emitting display of claim 1, wherein the one frame comprises the period of time from a first horizontal period corresponding to the programming period of the pixels arranged on the first pixel line to an nth horizontal period corresponding to the programming period of the pixels arranged on the nth pixel line, and the third transistor of each of the pixels arranged on the first pixel line is turned on for a kth horizontal period, and the third transistor of each of the pixels arranged on the second pixel line is turned on for a k+1th horizontal period, where k is a natural number greater than 2 and less than or equal to n.

### Claim 6 (depends on 5)

The organic light-emitting display of claim 5, wherein as the average value of data voltages of pixels arranged on each pixel line among the first pixel line to the nth pixel line is lowered, the value of k is lowered.

### Claim 7

A driving method of an organic light-emitting display comprising pixels arranged on a first pixel line to an nth pixel line, where n is a natural number, the method comprising:
sequentially programming a data voltage for the pixels arranged on the first pixel line to the nth pixel line according to a scan signal;
sequentially causing the programmed pixels to emit light; and
sequentially writing black data to the pixels arranged on the first pixel line to the nth pixel line in response to a black data control signal,
wherein the black data control signal is sequentially applied to the first pixel line to the nth pixel lines later than the scan signal, and
wherein an interval between the scan signal and the black data control signal is the same in all pixel lines among the first pixel line to the nth pixel line.

### Claim 8 (depends on 7)

The driving method of claim 7, wherein the sequentially programming of the data voltage comprises:
charging a gate electrode of a driving transistor of each pixel with a data voltage and applying a reference voltage to a source electrode of the driving transistor,
wherein the reference voltage is lower than an operating voltage of an organic light-emitting diode.

### Claim 9 (depends on 8)

The driving method of claim 8, wherein the sequentially writing of the black data to the pixels arranged on the first pixel line to the nth pixel line comprises:
applying the reference voltage to the gate electrode and source electrode of the driving transistor of the pixels.

### Claim 10 (depends on 7)

The driving method of claim 7, wherein, in the sequentially writing of the black data to the pixels arranged on the first pixel line to the nth pixel line, as an average value of video data of each pixel line among the first pixel line to the nth pixel line is lowered, the interval between the scan signal and the black data control signal is narrow.

### Claim 11 (depends on 7)

The driving method of claim 7, wherein the sequentially writing black data to the pixels arranged on the first pixel line to the nth pixel line comprises:
writing the black data to the pixels arranged on the first pixel line, in a period synchronized with the programming of the pixels arranged on a kth pixel line, and
writing the black data to the pixels arranged on the second pixel line, in a period synchronized with the programming of the pixels arranged on a k+1th pixel line, and
wherein k is a natural number greater than 2 and less than or equal to n.

### Claim 12 (depends on 11)

The driving method of claim 11, wherein as the average value of data voltages of pixels arranged on each pixel line among the first pixel line to the nth pixel line is lowered, the value of k is lowered.