LCD Array Subpixel Electrode Segmentation for Residual Image Control
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Solution Overview
Problem
Existing LCD panels face challenges in achieving both higher transmittance and preventing display residual images, particularly due to strong electric fields and flexoelectric effects in fringe field switching (FFS) display mode.
Innovation Solution
The array substrate incorporates a dual electrode layer configuration with first and second subpixel units, allowing for both fringe field switching (FFS) and in-plane switching (IPS) modes within the same substrate, reducing overlapping areas and enhancing transmittance while minimizing flexoelectric effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If FFS display mode is used, then transmittance is improved, but flexoelectric effect increases causing display residual images
Solution Approach 1:
The invention divides the pixel electrode into multiple segments (first pixel electrode and second pixel electrode) separated by a first gap, and divides the common electrode into multiple segments (third common electrode and fourth common electrode) separated by a second gap. This segmentation reduces the flexoelectric effect in each segment compared to a continuous electrode structure, thereby reducing display residual images while maintaining high transmittance through the gaps.
Solution Approach 2:
The invention introduces different gap structures at different locations: first gaps between pixel electrode segments and second gaps between common electrode segments. These local structural modifications create regions with reduced electric field strength, locally suppressing the flexoelectric effect while maintaining overall high transmittance through the distributed gap structure.
2Illumination intensity
If electrode overlapping area is reduced, then transmittance is improved, but electric field formation may be affected
Solution Approach 1:
By segmenting the electrodes and introducing controlled gaps, the invention reduces the total overlapping area between pixel and common electrodes, thereby improving transmittance. The segmented structure maintains electric field formation through the vertical electric field between corresponding segments while reducing the harmful horizontal electric field components.
Solution Approach 2:
The invention transitions from a two-dimensional overlapping electrode configuration to a three-dimensional segmented configuration with vertical separation. The gaps create vertical electric field components that maintain effective electric field formation for liquid crystal switching while reducing the horizontal field components that cause flexoelectric effects, thus preserving reliability while improving transmittance.
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 improves transmittance compared to single IPS mode and reduces flexoelectric effects, effectively addressing the issue of display residual images while maintaining high transmittance.
Implementation Method 1
due to a strong electric field, a large bending degree of the liquid crystal and obvious flexoelectric effect in the FFS display mode, it is easy to cause the problem of displaying a residual image on the LCD panel
Implementation Method 2
The top electrodes are disposed separately correspondingly to subpixels, the bottom electrodes are together on a whole surface, and an electric field is formed between the top electrodes and the bottom electrodes to drive a liquid crystal to work
Data Source
AI summary
Provided are an array substrate and a liquid crystal display panel. The array substrate includes first subpixel units and second subpixel units. A first electrode layer of the array substrate includes first electrodes, and each first subpixel unit is provided with the first electrode therein. A second electrode layer of the array substrate is disposed on the first electrode layer, and the second electrode layer includes second electrodes and third electrodes. Each first subpixel unit is provided with the second electrode(s), and each second subpixel unit is provided with two third electrodes arranged at intervals. In each first subpixel unit, ones of the first electrode and the second electrode(s) are pixel electrodes, and the other ones are common electrodes; and in each second subpixel unit, one of the two third electrodes is a pixel electrode, and the other is a common electrode.