Display Device Common Electrode Voltage Stability

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Solution Overview

Problem

Display devices experience screen display noise, such as horizontal crosstalk, due to the strong influence of data voltage on the common electrode when displaying solid colors.

Innovation Solution

A display device with a matrix arrangement of pixel electrodes, scanning lines, and data lines, where scanning signals and data voltages are sequentially provided, with opposite polarities and equal numbers of pixel electrodes receiving each voltage, to maintain stable common electrode voltage and reduce noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If data voltage is applied to pixel electrodes to display solid colors, then the display function is achieved, but the common electrode voltage becomes unstable causing screen display noise

Engineering Contradiction:

Improvedisplay qualityVSAvoidcommon electrode voltage stability

Core Design Contradiction:

Illumination intensityVSStability of the object's composition

Solution Approach 1:

The patent applies preliminary anti-action by introducing a compensation voltage to the common electrode that counteracts the voltage pull caused by data voltage application. This compensation voltage is applied in advance to prevent the instability and noise before they occur, rather than attempting to correct them after they manifest.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent changes the voltage parameter of the common electrode by dynamically adjusting its voltage level based on the display content. When solid colors are displayed, the common electrode voltage is compensated to maintain stability, transforming it from a fixed parameter to a dynamically adjustable one that adapts to different display conditions.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If data voltage with strong pull is applied to pixel electrodes, then the display function is achieved, but horizontal crosstalk noise occurs

Engineering Contradiction:

Improvedisplay functionVSAvoidhorizontal crosstalk noise

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful voltage pull effect into a beneficial compensation mechanism. By measuring and detecting the voltage influence on the common electrode, the system calculates a compensation voltage that transforms the harmful interaction between data voltage and common electrode into a controlled compensatory action that eliminates noise while maintaining display functionality.

Inventive Principle:

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

Data Source

PatentUS11475842B2Display device and driving method thereof

Publication Date: 2022.10.18 AU OPTRONICS CORP

AI summary

A display device includes a plurality of pixel electrodes, a plurality of gate lines, and a plurality of data lines. The pixel electrodes arranged in a matrix include a plurality of first color pixel electrodes. The gate lines are configured to sequentially provide a plurality of gate signals to the pixel electrodes in a plurality of line times. The data lines are configured to provide a plurality of the first data voltages and a plurality of the second data voltages to the first color pixel electrodes. The polarity of the first data voltages is opposite to the polarity of the second data voltages in the same frame. In each of the line times, the number of the first color pixel electrodes receiving the first data voltage is substantially equal to the number of the first color pixel electrodes receiving the second data voltages.