Display Panel Multiple-Refresh Scheduling for Low-Speed Operation

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Solution Overview

Problem

Organic light-emitting display apparatuses face issues with large refresh periods in low-speed operation, leading to image data leakage and response delays due to hysteresis characteristics of driving TFTs, which affect image quality and power consumption.

Innovation Solution

The display apparatus performs multiple refreshes during an initial period of a frame and then changes the refresh period, gradually increasing it over subsequent frames to improve response characteristics and maintain target image data levels, thereby reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the display apparatus operates in low-speed mode to reduce power consumption, then power consumption is reduced, but the refresh period becomes large causing image data leakage and response delays

Engineering Contradiction:

Improvepower consumptionVSAvoidimage data maintenance

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The refresh operation is segmented into multiple partial refreshes within the initial period of the first frame, rather than performing a single refresh. This segmentation allows the system to maintain image data integrity through multiple smaller refresh operations while still operating in low-speed mode to reduce overall power consumption

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple refreshes are performed during the initial period of the first frame before the display enters the lower refresh rate mode. This preliminary action ensures that image data is properly established and maintained before the extended refresh period begins, preventing data leakage while maintaining energy efficiency

Inventive Principle:

Principle #10Preliminary action

2Use of energy by moving object

If the refresh period is extended in low-speed operation, then power consumption is reduced, but response delay occurs due to hysteresis characteristic of driving TFT

Engineering Contradiction:

Improvepower consumptionVSAvoidresponse speed

Core Design Contradiction:

Use of energy by moving objectVSSpeed

Solution Approach 1:

The system employs periodic refresh actions during the initial period of the first frame, performing multiple refreshes at regular intervals before transitioning to the extended refresh period. This periodic action maintains fast response characteristics during the critical initial phase while enabling energy-saving low-speed operation for subsequent frames

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS12431092B2Display apparatus having an initial period with multiple refreshes and method thereof

Publication Date: 2025.09.30 LG DISPLAY CO LTD

AI summary

Disclosed are a display apparatus capable of changing a refresh period to improve response characteristics under a low-speed operation mode, and a method for operating the apparatus. The display apparatus includes a display panel; and a panel driving circuit configured to drive the display panel, wherein in a low-speed operation mode, the apparatus is configured to control the panel driving circuit to: perform multiple refreshes during an initial period of the first frame; and, after the multiple refreshes, change a refresh period and perform refreshes based on the changed refresh period.