# US 12,190,808 B2 · Light emitting display apparatus and driving method thereof

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- Number: US 12,190,808 B2
- Document ID: US12190808B2
- Status: Granted
- Kind: B2
- Application number: 18/227,198
- Filed: 2023-07-27
- Published: 2023-11-16
- Granted: 2025-01-07
- Earliest claimed: 2021-12-17
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Sang Yun Han
- Web page: https://patentgrep.com/patent/US12190808B2

## CPC

- G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED]
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 2300/0426: Layout of electrodes and connections
- 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 2310/0286: Details of a shift registers arranged for use in a driving circuit
- G09G 2310/061: for resetting or blanking
- G09G 2310/08: Details of timing specific for flat panels, other than clock recovery
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
- G09G 2320/0257: Reduction of after-image effects
- G09G 2320/043: Preventing or counteracting the effects of ageing
- G09G 2330/021: Power management, e.g. power saving
- G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD
- G09G 2340/0435: Change or adaptation of the frame rate of the video stream
- 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

A light emitting display apparatus and a driving method thereof. The light emitting display apparatus includes a display panel configured to display an image, a timing controller including an on bias stress (OBS) voltage calculator configured to calculate an optimal OBS voltage value on the basis of a refresh rate of the display panel and a data signal which is to be supplied to the display panel, and a power supply configured to generate an OBS voltage which is to be supplied to the display panel, on the basis of the optimal OBS voltage value.

## Claims

### Claim 1

A driving method of a light emitting display apparatus, the driving method comprising:
receiving a data voltage;
calculating a park voltage and a refresh rate that both correspond to the received data voltage;
calculating a first on bias stress (OBS) voltage and a second OBS voltage to apply during a refresh period of a display panel based on the calculated park voltage and the calculated refresh rate that corresponds to the received data voltage;
calculating a third OBS voltage and a fourth OBS voltage to apply during an anode reset period of the display panel that is after the refresh period, the third OBS voltage and the fourth OBS voltage calculated based on the calculated park voltage and the calculated refresh rate that corresponds to the received data voltage;
applying the first OBS voltage to the display panel before the data voltage applied to the display panel is sampled, during the refresh period of the display panel;
applying the second OBS voltage after the data voltage applied to the display panel is sampled, during the refresh period of the display panel;
applying the third OBS voltage before the data voltage applied to the display panel is sampled, during the anode reset period of the display panel that occurs after the second OBS voltage is applied to the display panel; and
applying the fourth OBS voltage after the data voltage applied to the display panel is sampled, during the anode reset period of the display panel.

### Claim 2 (depends on 1)

The driving method of claim 1, wherein the first OBS voltage to the fourth OBS voltage vary based on the refresh rate, the data voltage, and digital brightness.

### Claim 3 (depends on 1)

The driving method of claim 1, wherein the first OBS voltage to the fourth OBS voltage vary per at least one pixel, at least one line, or at least one frame based on the refresh rate and the data voltage.