Scrambled Gate Line Scanning for LCD Power Reduction

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Solution Overview

Problem

Conventional LCDs face high power consumption and temperature issues due to the fixed sequence of gate line scanning, which can lead to abnormal image display when specific display patterns are frequently displayed, causing excessive power usage and heat in the source driver.

Innovation Solution

Implementing a scrambled scan sequence for the gate lines driven by a gate driver, which can use pseudo-random binary sequences or random number tables to randomly select gate lines, reducing the likelihood of large power output in the source drivers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a fixed sequence is used to scan gate lines, then the gate driver can output scan signals in a predetermined order, but the source driver consumes excessive power and generates high temperature when specific display patterns are frequently shown

Engineering Contradiction:

Improvegate line scanning sequenceVSAvoidsource driver power consumption

Core Design Contradiction:

Ease of operationVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by making the gate line scanning sequence variable rather than fixed. The gate driver randomly selects the scanning sequence of gate lines according to a predetermined probability, allowing the system to adapt its operation to different display patterns and avoid consistent high power consumption states.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of scanning sequence from a fixed predetermined order to a randomly selected sequence. By varying the scanning sequence parameter based on probability distribution, the system can distribute power consumption more evenly across different operating conditions, preventing excessive power usage and heat generation.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a fixed sequence is used to scan gate lines, then the scanning process is simple and predictable, but abnormal image display occurs when specific display patterns are regularly shown due to excessive power output

Engineering Contradiction:

Improveimage display stabilityVSAvoidgate line scanning control

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces dynamic randomness into the gate line scanning sequence selection. The gate driver randomly selects scanning sequences according to predetermined probability, which prevents regular display patterns from consistently triggering high power consumption states that cause abnormal image display, thereby improving reliability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements a feedback mechanism where the gate driver monitors display patterns and adjusts the scanning sequence selection accordingly. By using predetermined probability to guide random selection, the system can avoid scanning sequences that would lead to abnormal image display while maintaining overall system reliability.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS9875707B2Display apparatus and gate driving method thereof

Publication Date: 2018.01.23 NOVATEK MICROELECTRONICS CORP

AI summary

A display apparatus and a gate driving method thereof are provided. The display apparatus includes a display panel and a gate driver. The display panel has a plurality of gate lines. Output terminals of the gate driver are coupled to the gate lines in a one-to-one manner. The gate driver is configured to drive the gate lines according to a scrambled scan sequence.