Liquid Crystal Display Dummy Pixel Potential Stabilization

Solution Overview

Problem

Liquid crystal display devices with dummy pixels suffer from light leakage and display irregularities due to unstable potential and impurity attraction near these non-display pixels, even when covered with light-blocking films.

Innovation Solution

Applying the same voltage to both the pixel and reference electrodes in dummy pixels prevents liquid crystal driving, maintaining a stable potential and eliminating light leakage and irregularities by ensuring the dummy pixels do not contribute to the display.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If dummy pixels are driven in the same manner as other pixels (transmission and blocking of light), then the dummy pixels can be covered with a light blocking film, but light leakage is generated from the end periphery of the light blocking film

Engineering Contradiction:

Improvelight leakageVSAvoiddisplay quality

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent extracts the harmful function of dummy pixels by separating them from the normal pixel driving mechanism. Dummy pixels are excluded from gate signal lines and drain signal lines, preventing them from performing transmission and blocking operations that cause light leakage at the light blocking film periphery.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies the same voltage to both pixel electrodes and reference electrodes in dummy pixels, creating an equipotential state. This stabilizes the potential in dummy pixels, preventing the unstable potential that would otherwise attract impurities and cause display irregularities.

Inventive Principle:

Principle #12Equipotentiality

2Object-affected harmful factors

If dummy pixels are separated from gate signal lines and drain signal lines to prevent light transmission and blocking, then light leakage is reduced, but the potential in dummy pixels becomes unstable and attracts impurities, causing display irregularities

Engineering Contradiction:

Improvelight leakageVSAvoidpotential stability

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The patent applies the same voltage to both pixel electrodes and reference electrodes in dummy pixels, creating an equipotential state. This stabilizes the potential in dummy pixels, preventing the unstable potential that would otherwise attract impurities and cause display irregularities.

Inventive Principle:

Principle #12Equipotentiality

3Productivity

If dummy pixels are covered with a light blocking film, then the dummy pixels can contribute to display, but display irregularities are generated in the vicinity of the dummy pixels due to unstable potential and impurity attraction

Engineering Contradiction:

Improvedisplay areaVSAvoiddisplay quality

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent extracts the harmful function of dummy pixels by separating them from the normal pixel driving mechanism. Dummy pixels are excluded from gate signal lines and drain signal lines, preventing them from performing transmission and blocking operations that cause light leakage at the light blocking film periphery.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies the same voltage to both pixel electrodes and reference electrodes in dummy pixels, creating an equipotential state. This stabilizes the potential in dummy pixels, preventing the unstable potential that would otherwise attract impurities and cause display irregularities.

Inventive Principle:

Principle #12Equipotentiality

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 configuration effectively prevents light leakage and display irregularities near dummy pixels, maintaining a stable potential and ensuring the dummy pixels do not interfere with the display, thus enhancing the overall display quality.

Implementation Method 1

a pixel electrode to which a video signal line is supplied from the drain signal line via the turned-on switching element, and a reference electrode which generates an electric field between the reference electrode and the pixel electrode

Methodology Applied

Scientific EffectElectric field: Electric Field

Implementation Method 2

a liquid crystal display device which includes non-display pixels which are called dummy pixels in general... with liquid crystal sandwiched therebetween

Methodology Applied

Scientific EffectLiquid crystal effect: Liquid Crystals

Data Source

PatentUS8358259B2Liquid crystal display device

Publication Date: 2013.01.22 MAGNOLIA PURPLE CORP

AI summary

The present invention provides a liquid crystal display device which can obviate the generation of leaking of light and display irregularities in the vicinities of so-called dummy pixels. The liquid crystal display device includes a pair of substrates which are arranged to face each other in an opposed manner with liquid crystal sandwiched therebetween, a plurality of gate signal lines and a plurality of drain signal lines which are formed on one substrate in a matrix array, a plurality of pixel regions defined by the gate signal lines and the drain signal lines, and a reference electrode and a pixel electrode which are formed in the inside of each pixel region. In such a constitution, the plurality of pixel regions are formed in both a display region and a non-display region, and a voltage applied to the reference electrodes is applied to the pixel electrodes in the inside of the pixel regions in the non-display region.