LCD Charge Share Device Dynamic Control

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Solution Overview

Problem

Liquid crystal display (LCD) devices face challenges in reducing power consumption and heat generation due to the inefficiencies in the data driver's charge share operation, which leads to increased power consumption and heat during the charge share process.

Innovation Solution

The implementation of a charge share device that selectively performs a charge share operation by storing charges during one interval and providing them to other data lines during another interval based on a comparison of video data, using a charge capacitor and a determiner to decide when to perform the charge share operation based on gray level differences, thereby reducing unnecessary power usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If charge share operation is performed during high interval of source output enable signal, then data voltages with same polarity can be applied during at least two horizontal intervals, but power consumption and heat generation increase

Engineering Contradiction:

Improvedata voltage application capabilityVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic control of the charge share operation by using a determiner to selectively enable or disable the charge share function based on gray level differences between adjacent data lines. When gray level differences exceed a threshold, charge share is disabled; when differences are small, charge share is enabled. This dynamic adaptation resolves the contradiction by adjusting the charge share operation according to actual display content requirements.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the operational parameter of the charge share device based on gray level difference thresholds. By comparing gray level values and dynamically adjusting whether charge share operation occurs, the system optimizes power consumption while maintaining display quality. This parameter-based control allows the system to adapt charge share behavior to different display scenarios.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

Engineering Contradiction:

Improvedata voltage application capabilityVSAvoidheat generation

Core Design Contradiction:

Adaptability or versatilityVSTemperature

Solution Approach 1:

The determiner dynamically adjusts charge share operation based on gray level differences, enabling heat reduction when display content varies significantly between adjacent lines. This dynamic control prevents unnecessary charge share operations that would generate heat, while still enabling the function when it provides benefit.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent converts the potential harm of unnecessary charge share operations (heat generation) into a benefit by using gray level difference detection to intelligently control when charge share should occur. The gray level comparison mechanism transforms what could be a source of heat waste into a useful control signal for optimizing thermal performance.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Device complexity

If positive and negative polarity buffers have single ended configuration, then circuit implementation is simplified, but current sharing between buffers is not possible leading to increased power consumption

Engineering Contradiction:

Improvebuffer configurationVSAvoidpower consumption

Core Design Contradiction:

Device complexityVSUse of energy by moving object

Solution Approach 1:

The patent makes the charge share device universal by enabling it to handle both positive and negative polarity data voltages through a single unified structure. The charge share device can selectively store charges corresponding to either positive or negative data voltages and provide them to appropriate data lines, eliminating the need for separate charge share circuits for each polarity while maintaining current sharing capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The charge share device acts as an intermediary between the positive and negative polarity buffers, enabling current sharing without requiring direct coupling between the buffers. The charge share device mediates the charge transfer process, storing charges from one buffer and providing them to data lines as needed, thereby reducing overall power consumption while keeping buffer configurations simple.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9280945B2Liquid crystal display device and method of driving the same

Publication Date: 2016.03.08 LG DISPLAY CO LTD

AI summary

An LCD device is disclosed which includes: a liquid crystal display panel in which there are a plurality of gate lines and a plurality of data lines; a data driver configured to apply data voltages to the data lines; a gate driver configured to apply gate pulses to the gate lines; and a charge share device configured to selectively perform a charge share operation by storing charges corresponding to a data voltage applied to one of the data lines during a first interval and providing the stored charges to said one or another one of the data lines during a second interval based on a comparison of first video data corresponding to said one of the data lines in the first interval with second video data corresponding to said one or another one of the data lines in the second interval.