Shield Electrode Between Pixel Electrodes in IPS LCD
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Solution Overview
Problem
Liquid crystal display devices using the IPS mode face challenges in achieving excellent display quality without restricting pixel electrode size, leading to decreased pixel definition and impaired luminance due to light leakage and color non-uniformity between neighboring pixels.
Innovation Solution
Incorporating a shield electrode between pixel electrodes on the array substrate to prevent electric field leakage from one pixel to another, maintaining high aperture ratio and luminance while maintaining pixel definition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pixel electrode size is increased to maintain high aperture ratio and luminance, then light leakage and color non-uniformity occur between neighboring pixels, but if pixel electrode size is decreased to improve pixel definition, then aperture ratio and luminance deteriorate
Solution Approach 1:
A shield electrode is introduced as an intermediary element positioned between adjacent pixel electrodes. This shield electrode, connected to the common electrode, acts as a barrier that blocks electric field lines from extending into neighboring pixel regions. By placing this intermediate structure at the boundary between pixels, the patent successfully prevents electric field leakage while preserving both pixel definition and aperture ratio, resolving the contradiction between precise pixel boundaries and high light utilization efficiency
2Object-affected harmful factors
If shield electrode is added between pixel electrodes to prevent electric field leakage, then light leakage and color non-uniformity are reduced, but device structure becomes more complex
Solution Approach 1:
The shield electrode is electrically connected to and merged with the common electrode, forming an integrated conductive structure. This merging approach allows the shield electrode to function as both a field-shielding element and part of the common electrode system, thereby reducing the number of independent components. The integrated structure simplifies the overall device complexity while maintaining the beneficial effect of preventing electric field leakage between pixels
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
The shield electrode effectively reduces light leakage and color non-uniformity, allowing for high-definition display without compromising the advantages of the IPS mode, achieving improved display quality by minimizing electric field interference between neighboring pixels.
Implementation Method 1
an electric field formed between a counter-electrode provided on an upper substrate and a pixel electrode provided on a lower substrate controls the alignment direction of a liquid crystal molecule included in a liquid crystal layer
Implementation Method 2
a shield electrode provided on the insulating film and located between the first pixel electrode and the second pixel electrode... the shield electrode effectively reduces light leakage and color non-uniformity, allowing for high-definition display without compromising the advantages of the IPS mode, achieving improved display quality by minimizing electric field interference between neighboring pixels
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes an array substrate, a counter-substrate and a liquid crystal layer. The array substrate includes a common electrode, an insulating film, a first pixel electrode, a second pixel electrode and a shield electrode. The insulating film is provided on the common electrode. The first pixel electrode and the second pixel electrode are provided on the insulating film and located with an interval therebetween. The shield electrode is provided on the insulating film and located between the first pixel electrode and the second pixel electrode.