Display Driver Memory Handshake for Sleep-Out Communication Recovery

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Solution Overview

Problem

Communication failures occur between the display driver and memory when a display device transitions from a sleep-in mode to a sleep-out mode, leading to reliability issues.

Innovation Solution

The display device includes a processor that determines the state of communication with the memory by checking and adjusting state data, and if necessary, powers off and on the display driver and memory to ensure proper communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the display device enters sleep-in mode to reduce power consumption, then power consumption is reduced, but communication failure occurs between display driver and memory when transitioning to sleep-out mode

Engineering Contradiction:

Improvepower consumptionVSAvoidcommunication reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The display driver performs preliminary actions before entering sleep-in mode by storing driving data in the memory and setting state data to indicate communication status. When transitioning from sleep-in to sleep-out mode, the driver checks this pre-set state data and re-establishes communication if necessary, preventing communication failures during mode transitions.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses state data as feedback to track communication status between the display driver and memory. The driver reads this state data upon waking from sleep mode and uses it to determine whether communication needs to be re-established, enabling reliable operation after power-saving mode without continuous monitoring overhead.

Inventive Principle:

Principle #23Feedback

2Reliability

If the display driver continuously monitors communication status with memory, then communication reliability is maintained, but device complexity increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidcontrol complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Instead of continuous monitoring, the system performs a preliminary action by setting state data before entering sleep mode. This single pre-action eliminates the need for continuous communication status monitoring during sleep-in mode, reducing control complexity while maintaining reliability through the pre-established communication state.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The memory and display driver use shared state data to self-verify communication status without requiring active monitoring or complex control protocols. The state data serves as a mutual acknowledgment mechanism that simplifies the interaction between components during mode transitions.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12633271B2Display device having memory for storing driving data and state data, driving method thereof, and electronic device including the same

Publication Date: 2026.05.19 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a processor configured to provide input image data, a display driver configured to display an image on a display panel based on the input image data and generate driving data for operating the display panel, and a memory configured to store the driving data and state data indicating whether communication with the display driver is possible. The display driver determines whether the state data is a first value when entering a sleep-out mode from a sleep-in mode, and changes the state data to the first value when the state data is not the first value.