Hollowed Common Electrode Reduces Parasitic Capacitance in ADS Array Substrates

Solution Overview

Problem

The existing ADS mode liquid crystal display technology has high power consumption due to excessive load on data lines, primarily caused by significant capacitance between the data line and the common electrode.

Innovation Solution

An array substrate design featuring a strip-like common electrode with a hollowed-out region over the data line and an insulating layer between the common and pixel electrodes, reducing parasitic capacitance and power consumption while maintaining pixel transmittance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a common electrode covers above the data line to suppress interference, then pixel transmittance is improved, but parasitic capacitance between data line and common electrode increases, causing power consumption to increase

Engineering Contradiction:

Improvepixel transmittanceVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The patent extracts the harmful portion of the common electrode by creating a hollowed-out region directly above the data line. This removes the source of parasitic capacitance while preserving the electrode's ability to suppress data line interference in other critical areas, thus reducing power consumption without significantly compromising pixel transmittance

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The common electrode is designed with non-uniform structure: it maintains full coverage in regions where interference suppression is critical for transmittance, but creates a hollowed-out region above the data line where parasitic capacitance would be harmful. This local differentiation optimizes both transmittance and power consumption by applying different electrode configurations in different spatial zones

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If a strip-like common electrode covers the data line to improve transmittance, then light leakage is suppressed, but the load on data line increases significantly

Engineering Contradiction:

Improvelight transmission efficiencyVSAvoiddata line load

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent extracts the harmful portion of the common electrode by creating a hollowed-out region directly above the data line. This removes the source of parasitic capacitance while preserving the electrode's ability to suppress data line interference in other critical areas, thus reducing power consumption without significantly compromising pixel transmittance

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The common electrode is designed with non-uniform structure: it maintains full coverage in regions where interference suppression is critical for transmittance, but creates a hollowed-out region above the data line where parasitic capacitance would be harmful. This local differentiation optimizes both transmittance and power consumption by applying different electrode configurations in different spatial zones

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design significantly reduces the load on data lines and overall power consumption of the liquid crystal panel without affecting pixel transmittance, enhancing the efficiency and performance of the display device.

Implementation Method 1

an insulating layer, disposed between the common electrode and the pixel electrode as well as between the common electrode and the data line

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Implementation Method 2

a region of the first common electrode corresponding to the data line is hollowed out... the capacitance between the data line and the common electrode covering thereon occupies the largest proportion with respect to the power consumption

Methodology Applied

Scientific EffectParasitic capacitance reduction: Capacitance

Implementation Method 3

forming a multi-dimensional electric field with an electric field generated from edges of slit-electrodes in the same plane and an electric field generated between a slit-electrode layer and a plate-electrode layer, enables liquid crystal molecules in all orientations between the slit-electrodes and directly above the electrodes within a liquid crystal cell to rotate

Methodology Applied

Scientific EffectElectric field: Electric Field

Data Source

PatentUS9099356B2Array substrate with hollowed common electrode above data line and manufacturing method thereof and display device

Publication Date: 2015.08.04 BEIJING BOE OPTOELECTRONCIS TECH CO LTD

AI summary

Embodiments of the present invention provide an array substrate, comprising: a base substrate; a gate line and a data line formed on the base substrate, the gate line and the data line crossing with each other to define a pixel region; a thin film transistor and a pixel electrode, disposed in the pixel region; a strip-like common electrode, disposed above the pixel electrode and the data line, the common electrode comprising a first common electrode which covers above the data line and has a width greater than that of the data line; and a second common electrode, disposed above the pixel electrode; an insulating layer, disposed between the common electrode and the pixel electrode as well as between the common electrode and the data line, wherein a region of the first common electrode corresponding to the data line is hollowed out.