Display Device Idle Driving Timing Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing display driving methods face challenges in performing idle driving effectively when timing information is not transmitted to the liquid crystal module in advance, particularly when the image generation speed of the CPU/GPU varies, leading to display timing deviations and quality deterioration.

Innovation Solution

A method for driving a display device that involves delaying the supply of display data to the data signal line driving circuit during a recovery period, allowing the circuit to transition from a sleep state to an active state, thereby enabling appropriate idle driving without relying on advance timing information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If idle driving is adopted to reduce power consumption, then power consumption is reduced, but display timing deviation occurs when timing information is not transmitted in advance

Engineering Contradiction:

Improvepower consumptionVSAvoiddisplay timing accuracy

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The liquid crystal module autonomously determines the start timing of frame scanning by detecting the rising edge of the synchronization signal, eliminating dependency on advance timing information from the CPU/GPU side. This self-service mechanism enables idle driving to function correctly without compromising display timing accuracy.

Inventive Principle:

Principle #25Self-service

2Loss of energy

If the vertical blank period is extended to achieve sufficient power consumption reduction, then power consumption is reduced, but the scanning period is shortened

Engineering Contradiction:

Improvepower consumptionVSAvoidscanning period

Core Design Contradiction:

Loss of energyVSDuration of action of moving object

Solution Approach 1:

The invention changes the parameter of vertical blank period duration, setting it to be equal to or longer than the scanning period. This parameter adjustment enables the pause period to be sufficiently long for power savings while the synchronization signal mechanism ensures the scanning period maintains appropriate duration for complete frame rendering.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the refresh rate is changed in accordance with image generation speed to prevent display timing deviation, then display timing accuracy is maintained, but device complexity increases

Engineering Contradiction:

Improvedisplay timing accuracyVSAvoidcontrol mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The liquid crystal module autonomously adapts to variable refresh rates by detecting the synchronization signal timing and automatically adjusting its frame scanning start timing. This self-service capability maintains display timing accuracy across different image generation speeds without requiring complex external control mechanisms or advance timing information.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11482185B2Method for driving display device, and display device

Publication Date: 2022.10.25 SHARP KK

AI summary

A method for driving a display device capable of appropriately performing idle driving even when timing information is not transmitted to a liquid crystal module in advance is provided. In a case where, in one vertical period, a non-scanning period other than a scanning period in which a screen of a display unit is scanned once is set to a pause period, a liquid crystal module delays supply of a data signal to the display unit by a recovery period during which a source driver is recovered from a sleep state to an active state in the pause period.