Liquid Crystal Display Data Line Asymmetry for Color Shift Reduction
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Solution Overview
Problem
Liquid crystal display devices in plane line switching mode experience color shift due to unequal transmittance in sub-pixel areas caused by the larger contact hole size for organic insulating materials, leading to reduced visibility and image quality.
Innovation Solution
The design includes a data line with specific angled portions and a slit structure in the pixel electrode, along with optimized liquid crystal rubbing directions, to ensure equal transmittance in both sub-pixel areas by adjusting the lengths and angles of the data line portions and forming the contact electrode within one sub-pixel area, thereby preventing color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a passivation layer made of organic insulating material is formed under the common electrode to reduce load on data lines, then the transmittance is maintained, but the contact hole size becomes larger which reduces the transmittance of one sub-pixel
Solution Approach 1:
The patent applies asymmetry by intentionally making the contact hole in the first sub-pixel area different from the second sub-pixel area. Specifically, the contact hole is formed only in the first sub-pixel area while the second sub-pixel area maintains full transmittance, compensating for the larger contact hole size required by the organic insulating material thickness.
Solution Approach 2:
The patent applies local quality by making different parts of the pixel area have different properties. The first sub-pixel area has a contact hole to accommodate the thicker organic insulating material, while the second sub-pixel area has no contact hole, creating localized differences in structure to achieve overall balance in transmittance.
2Reliability
If the contact hole is made larger to penetrate through the thick organic insulating material, then electrical connection is achieved, but the transmittance of the sub-pixel is reduced
Solution Approach 1:
The patent extracts the contact hole formation to only one sub-pixel area (first sub-pixel) rather than both sub-pixel areas. This removes the transmittance penalty from the second sub-pixel while maintaining the necessary electrical connection in the first sub-pixel through the larger contact hole required for the thick organic insulating material.
3Ease of manufacture
If the transmittance of one sub-pixel is lower than the other sub-pixels, then the contact hole can be formed through the organic insulating material, but color shift occurs in the resulting images
Solution Approach 1:
The patent deliberately creates an asymmetric structure where the contact hole is present only in the first sub-pixel area, not in the second sub-pixel area. This asymmetric design compensates for the transmittance loss in the first sub-pixel, ensuring that the overall transmittance of both sub-pixel areas is substantially equal, thereby preventing color shift.
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 ensures that both sub-pixel areas have substantially the same transmittance, minimizing color shift and maintaining image quality by optimizing the data line orientation and liquid crystal alignment.
Implementation Method 1
applying a voltage to field generating electrodes to generate an electric field in the liquid crystal layer, which determines alignment of liquid crystal molecules of the liquid crystal layer and controls polarization of incident light
Implementation Method 2
controls polarization of incident light
Implementation Method 3
alignment of liquid crystal molecules of the liquid crystal layer
Data Source
AI summary
The present invention relates to a liquid crystal display device that prevents a color shift by allowing two sub-pixel areas to have the same transmittance. A liquid crystal display device according to the present invention includes a data line that includes: a connection portion having a direction of extension perpendicular to that of a gate line; a first portion oriented at a first angle with respect to a direction of extension of the connection portion; and a second portion oriented at a second angle different from the first angle with respect to the direction of extension of the connection portion, and wherein an angle between a rubbing direction of the liquid crystal and the connection portion satisfiesθL=θ2-θ12(where θL is the angle between the rubbing direction of the liquid crystal and the direction of extension of the connection portion, θ1: the first angle, θ2: the second angle).