Liquid Crystal Display Sub-Pixel Voltage Control

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Solution Overview

Problem

Conventional liquid crystal display devices with a multi-pixel structure face challenges in reducing power consumption due to limitations in setting the amplitude of the video signal, as the common electrode potential cannot be freely set, and the existing methods are not suitable for devices with a multi-pixel configuration, leading to inefficient power management and potential deviations in liquid crystal application voltage.

Innovation Solution

An active matrix-type display device with a multi-pixel structure incorporates first and second pixel electrodes, amplification circuit units, and control wirings to adjust potentials dynamically, allowing for a smaller video signal amplitude while maintaining effective display characteristics by alternately applying potentials to control wirings and scanning signal lines, thereby reducing power consumption and improving view angle compensation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by stationary object

If the amplitude of the video signal is reduced to lower power consumption, then power consumption is reduced, but the liquid crystal application voltage may deviate from the intended value

Engineering Contradiction:

Improvepower consumptionVSAvoidliquid crystal application voltage precision

Core Design Contradiction:

Use of energy by stationary objectVSManufacturing precision

Solution Approach 1:

The patent changes the potential of the common electrode dynamically during the selection period. By setting the common electrode potential to a first potential during a first period and switching to a second potential during a second period, the system compensates for voltage deviations caused by reduced video signal amplitude, thereby maintaining precise liquid crystal application voltage while reducing power consumption

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dynamic potential adjustment of the common electrode during the selection period. The common electrode potential is not fixed but changes between a first potential and a second potential at different times within the selection period, allowing the system to adapt and compensate for voltage deviations in real-time

Inventive Principle:

Principle #15Dynamics

2Device complexity

If the common electrode potential is fixed to simplify the structure, then device complexity is reduced, but the ability to compensate for voltage deviations is limited

Engineering Contradiction:

Improvecontrol wiring complexityVSAvoidvoltage compensation capability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent segments the selection period into a first period and a second period, with different common electrode potentials applied in each period. This temporal segmentation allows the system to provide different voltage levels at different times, enabling voltage compensation without requiring complex spatial structures

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs periodic action by alternating between a first potential and a second potential for the common electrode during the selection period. This periodic potential switching enables the system to compensate for voltage deviations through time-varying voltage application

Inventive Principle:

Principle #19Periodic action

3Device complexity

If a single pixel structure is used to simplify the circuit design, then device complexity is reduced, but view angle characteristics deteriorate

Engineering Contradiction:

Improvepixel circuit complexityVSAvoidview angle characteristic

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent divides a single pixel into multiple sub-pixels (first sub-pixel and second sub-pixel), each with its own pixel electrode. This segmentation allows different sub-pixels to have different potentials, thereby improving view angle characteristics while maintaining relatively simple circuit design through shared control wirings

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS9230497B2Display device having each pixel divided into sub pixels for improved view angle characteristic

Publication Date: 2016.01.05 SHARP KK

AI summary

In a liquid crystal display device having a configuration in which one pixel is divided into a plurality of sub pixels, low power consumption is realized by reducing an amplitude of a video signal. In each pixel formation portion, an amplification circuit unit including a second-capacitor is provided between a dark display pixel electrode and a bright display pixel electrode. A selection period consists of a precharge period and an amplification period. In the precharge period, a potential of a control wiring is applied to the dark display pixel electrode, and a potential of a video signal line is applied to the bright display pixel electrode. In the amplification period, a potential of the video signal line is applied to the dark display pixel electrode in the state where the bright display pixel electrode is placed in a floating state.