Inclined Linear Electrodes for Liquid Crystal Display Transmittance
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Solution Overview
Problem
In liquid crystal display devices, the transmittance of stacked panels is lower than that of a single panel due to the product of individual transmittances, and existing designs with linear electrodes can lead to disclination lines and reduced transmittance, especially when pixel electrodes are formed from linear branches.
Innovation Solution
A liquid crystal display panel with pixel electrodes featuring linear electrodes where the boundary line and end sides are inclined in the same direction relative to the initial alignment direction of the liquid crystal, which helps in suppressing disclination lines and dark lines by ensuring continuous rotation of liquid crystal molecules, thereby enhancing transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pixel electrodes are formed from linear electrodes to suppress dark lines, then dark line occurrence is reduced, but disclination lines occur between adjacent pixels causing transmittance decline
Solution Approach 1:
The patent applies asymmetry by inclining the linear electrodes at specific angles (e.g., 15-45 degrees) relative to the pixel boundary lines. This asymmetric orientation prevents the formation of disclination lines at pixel boundaries while maintaining the suppression of dark lines, resolving the contradiction between these two harmful effects.
Solution Approach 2:
The patent changes the orientation parameter of the linear electrodes from being parallel to pixel boundaries to being inclined at specific angles. This parameter modification allows the electrodes to suppress dark lines effectively while avoiding the creation of disclination lines, thus improving overall transmittance.
2Illumination intensity
If multiple liquid crystal display panels are stacked to improve contrast, then contrast is enhanced, but transmittance decreases due to the product of individual panel transmittances
Solution Approach 1:
The patent changes the orientation parameter of linear electrodes in stacked panels to specific inclined angles, which reduces disclination line formation and minimizes light scattering at pixel boundaries. This enables higher transmittance in each panel, thereby maintaining better overall transmittance in stacked configurations while preserving contrast enhancement benefits.
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 the transmittance of the liquid crystal display panel by controlling the rotation of liquid crystal molecules at boundaries and within pixels, reducing disclination and dark line occurrences, and maintaining high light transmission efficiency.
Implementation Method 1
liquid crystal that rotates in-plane due to voltage applied by the pixel electrode and the common electrode
Data Source
AI summary
A liquid crystal display panel includes a plurality of pixels. The pixels each include a pixel electrode, a common electrode, and a liquid crystal that rotates in-plane due to voltage applied by the pixel electrode and the common electrode. The pixel electrode includes a linear electrode. When an initial alignment direction of the liquid crystal for which dielectric anisotropy is positive, or a direction perpendicular to the initial alignment direction of the liquid crystal for which dielectric anisotropy is negative is defined as a predetermined first direction, at a boundary between pixels, of the plurality of pixels, that are adjacent to each other, a boundary line between the adjacent pixels, the linear electrode, and an end side of the linear electrode are inclined with respect to the predetermined first direction, and inclining directions with respect to the predetermined first direction of the boundary line, the linear electrode, and the end side are identical.