LCD Panel Timing Control for Lower Power and EMI

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Large-scale display devices face issues with high power consumption and electromagnetic interference (EMI), which affect display quality.

Innovation Solution

A display device with a liquid crystal display (LCD) panel, driver circuit, and switch circuit, where the timing controller adjusts control signals within specific voltage ranges based on data signal polarity to reduce voltage swings and switching frequency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the control signal switches frequently within a wide voltage range to accommodate data signals of different polarities, then the display device can handle both positive and negative polarity data signals, but power consumption and electromagnetic interference increase

Engineering Contradiction:

Improveability to handle different polarity data signalsVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic control signal generation where the voltage range of the control signal is adjusted based on the polarity of the incoming data signal. When the data signal has positive polarity, the control signal switches within a first voltage range; when negative polarity, it switches within a second voltage range. This dynamic adaptation reduces unnecessary voltage swings and switching frequency, thereby lowering power consumption while maintaining the ability to handle both polarities.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the voltage range parameter of the control signal based on data signal polarity. By selecting appropriate voltage ranges (first voltage range for positive polarity, second voltage range for negative polarity), the system optimizes the control signal characteristics to minimize power consumption and EMI while preserving adaptability to different data signal polarities.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

Engineering Contradiction:

Improveability to handle different polarity data signalsVSAvoidelectromagnetic interference

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The timing controller dynamically selects the voltage range for control signal switching based on data signal polarity. This dynamic approach reduces unnecessary high-frequency switching and large voltage swings, which are primary sources of electromagnetic interference, while maintaining the system's ability to process both positive and negative polarity data signals effectively.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

By changing the voltage range parameter of the control signal according to data signal polarity, the patent minimizes voltage swings and switching frequency. This parameter optimization directly reduces electromagnetic interference generated by rapid voltage transitions, while preserving the adaptability to handle different polarity data signals.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the control signal switches multiple times within each line time to maintain display quality, then display quality is improved, but power consumption and switching frequency increase

Engineering Contradiction:

Improvedisplay qualityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic control signal generation where the voltage range is adapted based on data signal polarity. This reduces unnecessary switching operations while maintaining adequate display quality, thereby lowering power consumption without compromising reliability.

Inventive Principle:

Principle #15Dynamics

4Reliability

If the control signal switches multiple times within each line time to maintain display quality, then display quality is improved, but switching frequency increases

Engineering Contradiction:

Improvedisplay qualityVSAvoidswitching frequency

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The timing controller dynamically adjusts the control signal voltage range based on data signal polarity, reducing unnecessary switching operations. This dynamic approach maintains display quality by ensuring appropriate voltage levels are applied while minimizing switching frequency and its associated EMI problems.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12567386B2Display device and operating method thereof for controlling LCD panel

Publication Date: 2026.03.03 HIMAX TECH LTD

AI summary

A display device and an operating method are provided. The display device includes a liquid crystal display (LCD) panel, a driver circuit, a switch circuit, and a timing controller. The LCD panel comprises a plurality of data lines. The driver circuit is configured to provide a first data signal to a first data line of the plurality of data lines in a first frame time. The switch circuit comprises a first switch configured to provide the first data signal to the first data line according to a first control signal. The timing controller is configured to provide the first control signal switching within a first voltage range when the first data signal has a first polarity, and provide the first control signal switching within a second voltage range different from the first voltage range when the first data signal has a second polarity.