LCD Driving Method Reducing Power via Data Comparison

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Solution Overview

Problem

LCD devices experience unnecessary power consumption and severe electromagnetic interference due to redundant signal generation and transmission, especially with increasing resolution.

Innovation Solution

A driving method and device that sequentially receive image data and determine if it is the same as previous data, controlling the data-line driving circuit not to read in driving data when it is identical, thereby saving power and reducing signal transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the data-line driving circuit reads in driving data sequentially for each scan-line, then the LCD can display images correctly, but unnecessary power consumption occurs when consecutive image data are identical

Engineering Contradiction:

Improveimage display correctnessVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The timing controller performs preliminary comparison of consecutive image data before generating driving data. When identical data are detected, the controller skips redundant data generation and transmission, preventing unnecessary power consumption while maintaining correct display through the comparison mechanism itself

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback by comparing consecutive image data and using the comparison result to control whether driving data should be generated and transmitted. This feedback loop eliminates redundant operations when image data remain unchanged, reducing power consumption without affecting display correctness

Inventive Principle:

Principle #23Feedback

2Loss of information

If driving data are generated and transmitted for every scan-line, then complete image data is provided, but severe electromagnetic interference occurs due to redundant signal transmission

Engineering Contradiction:

Improveimage data completenessVSAvoidelectromagnetic interference

Core Design Contradiction:

Loss of informationVSObject-generated harmful factors

Solution Approach 1:

The timing controller performs preliminary comparison of image data before generating driving signals. When consecutive scan-line data are identical, the controller skips redundant signal generation and transmission, eliminating electromagnetic interference while maintaining image data completeness through the comparison mechanism

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system extracts and removes redundant driving data and control signals from the transmission stream when consecutive image data are identical. This extraction eliminates unnecessary signal transmission that causes electromagnetic interference while preserving all necessary information for correct display

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS8878764B2Driving method and related device for reducing power consumption of LCD by comparing received data

Publication Date: 2014.11.04 NOVATEK MICROELECTRONICS CORP

AI summary

A driving method is provided for reducing power consumption of a liquid crystal display. The driving method includes steps of sequentially receiving first data and second data, determining whether the second data is the same as the first data, and controlling a data-line driving circuit not to read in driving data corresponding to the second data when the second data is the same as the first data.