Bent Source Wiring in FFS Electrodes for Aperture Ratio
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Solution Overview
Problem
Existing FFS mode liquid crystal display devices face a challenge in increasing the aperture ratio while maintaining high viewing angle characteristics and suppressing color mixing defects.
Innovation Solution
The liquid crystal display device incorporates a specific electrode structure with slits that form acute angles with the pixel short-hand direction, and the source wiring lines are bent at the boundary between different slit regions, optimizing the distance between the slits and the wiring lines to enhance the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance from the source wiring line to the slit end is increased to suppress adverse effects and color mixing defects, then display quality is improved, but the aperture ratio decreases
Solution Approach 1:
The patent introduces a new spatial dimension by bending the source wiring line in a direction other than the conventional straight extension. The wiring line is bent at a bending portion with a specific radius, allowing it to navigate around the slit region. This dimensional change enables the wiring line to maintain an adequate distance from the slit end while occupying less linear space, thereby preserving both display quality and aperture ratio.
Solution Approach 2:
The source wiring line is designed with a curved bending portion having a specific radius of curvature. This curvature allows the wiring line to smoothly transition and maintain the required distance from the slit end without extending linearly, thus optimizing the space utilization and improving the aperture ratio while maintaining display quality.
2Area of stationary object
If the slit arrangement is optimized to increase aperture ratio, then more light can pass through, but color mixing defects may occur
Solution Approach 1:
The patent applies different characteristics to different regions: the slit portion has specific dimensions and orientation to maximize light transmission, while the wiring line has a bent configuration with specific radius to control its proximity to the slit. This local differentiation allows each element to optimize its function - slits for light transmission and wiring for signal conduction - while maintaining appropriate spatial relationships to prevent color mixing defects.
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 increases the aperture ratio of the FFS mode liquid crystal display device while maintaining high viewing angle characteristics and suppressing color mixing defects, leading to improved display quality.
Implementation Method 1
a first electrode and a second electrode, both of which are configured to generate a fringe electrical field causing the liquid crystal molecules to align in a direction different from the initial alignment direction
Data Source
AI summary
A liquid crystal display device includes source wiring lines, and first electrode and second electrode configured to generate a fringe electrical field. The first electrode includes slits. Each slit forms an acute angle with pixel short-hand direction defined in row direction smaller than an acute angle formed by each slit and pixel longitudinal direction defined in column direction. The slits include first slits each extending an acute angle in a clockwise direction with respect to the pixel short-hand direction, and second slits each extending an acute angle in a counterclockwise direction with respect to the pixel short-hand direction. The first electrode includes first region in which the first slits are formed, and second region in which the second slits are formed. In a plan view, each source wiring line is bent at a position corresponding to a boundary between the first region and the second region.