Projector Standby Resume Speed via Dual Volatile Memory Segmentation

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Solution Overview

Problem

Display devices face a delay in resuming image display after entering a standby state due to the slower data retrieval from nonvolatile storage compared to volatile storage, leading to a time lag before images can be displayed again.

Innovation Solution

Incorporating a volatile second memory that retains data during the standby state, allowing the processor to store display object data in this memory when transitioning to standby and retrieve it quickly when returning to normal operation, thereby bypassing the need for slow nonvolatile storage retrieval.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If data is stored in nonvolatile storage device, then data is retained during standby state, but data retrieval time is slow

Engineering Contradiction:

Improvedata retentionVSAvoiddata retrieval time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent divides the storage system into two segments: a first volatile storage device for fast data access and a second nonvolatile storage device for data retention during standby. By segmenting the storage functions, the system achieves both fast retrieval and reliable data retention without the time penalty of slow nonvolatile storage access.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first volatile storage device acts as an intermediary between the processor and the second nonvolatile storage device. During standby, data is copied to the first storage device which maintains it in a ready state, serving as a buffer that enables fast retrieval without requiring continuous power to the nonvolatile storage.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If volatile memory is used for fast data access, then data retrieval speed is fast, but data is lost when power is stopped

Engineering Contradiction:

Improvedata retrieval speedVSAvoiddata retention

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

Before entering standby mode, the processor copies necessary data from the nonvolatile second storage device to the volatile first storage device. This preliminary action ensures that the volatile memory contains the data needed for quick retrieval, while the system prepares for power reduction by having already transferred essential information.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a data copying mechanism where data is replicated from the nonvolatile second storage device to the volatile first storage device. This copying allows the system to maintain a working copy in fast memory while preserving the master copy in nonvolatile storage, enabling both speed and reliability.

Inventive Principle:

Principle #26Copying

3Ease of operation

If display device returns from standby state, then operation resumes, but time lag occurs before image display

Engineering Contradiction:

Improveoperation resumptionVSAvoidtime lag

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The first volatile storage device maintains data in a ready state during standby, keeping the data access pathway active and continuous. When returning from standby, the processor can immediately access the data already loaded in the first storage device without the interruption of reading from nonvolatile storage, thus eliminating time lag and maintaining continuous useful action.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS11886101B2Display device, and method of controlling display device

Publication Date: 2024.01.30 SEIKO EPSON CORP

AI summary

A projector is provided with a CPU, a first memory which is a volatile memory to be reset when the projector makes the transition to a standby state, and a second memory which is a volatile memory capable of keeping data in the standby state of the projector. The CPU stores OSD data in the second memory when the projector makes the transition to the standby state.