Liquid Crystal Display Electrode Segmentation for Viewing Angle
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Solution Overview
Problem
Liquid crystal display apparatuses in the FFS mode suffer from deteriorated viewing angle characteristics and reduced light transmittance due to the fringe electric field, which is not effectively addressed by existing solutions that aim to improve these aspects.
Innovation Solution
The proposed liquid crystal display apparatus features a configuration with independently driven second and third electrodes, where the fringe electric field is minimized by applying a reference potential to the first electrode and a potential for gradation-driving to the second electrode at lower gradation levels, and a potential for gradation-driving to the third electrode at higher gradation levels, optimizing the electric field components orthogonal to the substrate to enhance viewing angle characteristics without lowering light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If FFS mode is used with fringe electric field, then aperture ratio and luminance are improved, but viewing angle characteristics deteriorate
Solution Approach 1:
The patent divides the single common electrode into two separate electrodes (first common electrode and second common electrode) positioned at different heights. This segmentation allows independent control of electric field distribution, enabling optimization of both luminance and viewing angle characteristics by selectively controlling the fringe electric field components.
Solution Approach 2:
The patent introduces a vertical dimension by positioning the first and second common electrodes at different heights (different z-coordinates). This three-dimensional arrangement creates independent electric field components in different directions, allowing the first common electrode to provide fringe electric field for luminance while the second common electrode controls vertical electric field components for viewing angle.
2Area of stationary object
If FFS mode is used with fringe electric field, then aperture ratio is improved, but light transmittance is reduced
Solution Approach 1:
By segmenting the common electrode structure into two independently controllable electrodes, the patent can optimize the electric field distribution to maintain high aperture ratio while improving light transmittance through better control of fringe electric field components.
Solution Approach 2:
The patent changes the electrical parameters by applying different potentials to the first and second common electrodes independently. This allows optimization of the electric field strength and distribution to achieve both high aperture ratio and high light transmittance simultaneously.
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 suppresses the deterioration of viewing angle characteristics while maintaining high light transmittance, allowing for improved display quality even when viewed from oblique directions, by reducing the region of fringe electric field and optimizing the electric field components.
Implementation Method 1
An electric field is applied between the pixel electrode and the common electrode so as to drive liquid crystal molecules
Implementation Method 2
liquid crystal display apparatus for displaying an image, and more specifically to a liquid crystal display apparatus of a transverse electric field mode
Data Source
AI summary
A liquid crystal display apparatus comprises a planar first electrode, multiple second electrodes and third electrodes that overlap with the first electrode and are alternately arranged, in correspondence to one subpixel. The second electrode and the third electrode are independently driven. A voltage for driving the liquid crystal is individually applied between the second electrode and the first electrode and between the third electrode and the first electrode.