Tetragonal LCD Pixel Electrodes for Capacitance Deviation
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Solution Overview
Problem
In liquid crystal display (LCD) devices, capacitance deviations between pixels occur due to distorted metal layer overlaps, leading to image quality degradation, including line dimming and flicker, especially when pixels are formed in a trapezoid shape.
Innovation Solution
The LCD device features gate lines and data lines formed in a tetragonal shape, with pixel electrodes and common electrodes configured to have finger patterns, ensuring equal overlap areas and preventing capacitance differences between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pixels are formed in a trapezoid shape with inclined data lines, then a 2-domain structure is achieved which improves viewing angle and solves color shift, but metal layers become distorted without proper overlapping, causing capacitance deviation between pixels
Solution Approach 1:
The patent applies asymmetry by forming data lines at an inclination angle to create the 2-domain structure for improved viewing angle, while simultaneously using a specific tetragonal pixel configuration that compensates for the resulting metal layer distortion. This asymmetric data line arrangement combined with symmetric pixel boundaries resolves the contradiction between achieving wide viewing angles and maintaining manufacturing precision.
Solution Approach 2:
The patent changes the geometric parameters of the pixel structure by defining pixels with tetragonal boundaries formed by vertical gate lines and horizontal data lines, even though data lines are inclined. This parameter change in the pixel definition method ensures consistent metal layer overlap areas while maintaining the inclined data line configuration needed for 2-domain structure.
2Adaptability or versatility
If data lines are alternately formed to be inclined at a certain angle, then a 2-domain pixel structure is created, but capacitances of pixels differ due to varying metal layer overlap areas, causing line dim and flicker
Solution Approach 1:
The patent applies local quality by ensuring that each pixel has a specific tetragonal configuration with vertically aligned gate lines and horizontally aligned data lines within the pixel boundary. This local structural consistency within each pixel ensures uniform metal layer overlap areas, while the overall inclined data line arrangement maintains the 2-domain structure capability.
Solution Approach 2:
The patent achieves equipotentiality in terms of electrical capacitance by designing all pixels to have identical tetragonal boundaries formed by the intersection of vertical gate lines and horizontal data lines. This ensures that all pixels have equal overlap areas with metal layers, creating equipotential conditions for consistent capacitance values across the display, thereby preventing line dim and flicker.
3Area of stationary object
If contact holes are formed in storage capacitor areas to prevent aperture ratio loss, then aperture ratio is maintained, but pixel structure complexity increases with multiple layers needing precise alignment
Solution Approach 1:
The patent applies preliminary action by pre-defining the tetragonal pixel boundaries and contact hole positions during the early stages of pattern formation. The pixel boundaries are established by vertical gate lines and horizontal data lines before subsequent metal layer deposition, ensuring that contact holes are automatically positioned in optimal locations that maintain aperture ratio while simplifying subsequent alignment processes.
Data Source
AI summary
Disclosed are an LCD device and a method of manufacturing the same, which reduce a capacitance deviation between pixels without any change in a viewing angle and a high transmittance. The LCD device includes a plurality of gate lines formed in a first direction on a substrate, a plurality of data lines formed in a second direction to intersect the plurality of gate lines, a thin film transistor (TFT) formed in each of a plurality of pixel areas defined by the plurality of gate lines and the plurality of data lines, a pixel electrode formed in a tetragonal shape in each of the plurality of pixel areas, and a common electrode formed on the pixel electrode, and configured to include a plurality of finger patterns. Each of the plurality of pixel areas is formed in a tetragonal shape.