Viewing Angle Control Subpixel Storage Capacitor Aperture Ratio
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Solution Overview
Problem
Conventional liquid crystal display devices have thick insulating layers that reduce the aperture ratio and restrict the narrow viewing angle characteristic due to deviations in critical dimension, leading to poor viewing angle performance.
Innovation Solution
A liquid crystal display device with a viewing angle control subpixel that includes a lower transparent electrode between a shielding electrode and an upper transparent electrode, connected by a storage capacitor formed with a first insulation film, improving the aperture ratio and viewing angle control efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a thick insulating layer is formed in conventional liquid crystal display devices, then the manufacturing process is simplified, but the aperture ratio is reduced and viewing angle characteristics are restricted
Solution Approach 1:
The patent introduces a new spatial dimension by placing the storage capacitor electrode (second electrode) in the viewing angle control subpixel area, which is traditionally occupied by the common electrode. This dimensional reorganization allows the storage capacitor to be formed without increasing the thickness of insulating layers in the pixel electrode area, thereby maintaining aperture ratio while simplifying manufacturing.
Solution Approach 2:
The patent segments the display panel into different functional subpixels: normal subpixels (RGB) and viewing angle control subpixels. The storage capacitor structure is specifically implemented in the viewing angle control subpixels, allowing differentiated optimization of aperture ratio and manufacturing complexity across different functional areas.
2Reliability
If the shielding electrode area is increased to improve viewing angle control, then viewing angle characteristics improve, but the aperture ratio is reduced
Solution Approach 1:
The patent applies local quality by implementing the storage capacitor structure specifically in the viewing angle control subpixel area rather than uniformly across the entire display. The second electrode is positioned to overlap with the shielding electrode only in the viewing angle control subpixels, providing localized viewing angle control without sacrificing aperture ratio in the pixel electrode area.
3Ease of manufacture
If the storage capacitor is formed with thick insulating layers, then the manufacturing process is simplified, but the critical dimension deviation increases and aperture ratio is reduced
Solution Approach 1:
The patent resolves the manufacturing precision issue by forming the storage capacitor in a different spatial location (viewing angle control subpixel) rather than relying on thick insulating layers in the pixel area. This dimensional separation allows thin insulating layers to be used with precise critical dimensions while maintaining ease of manufacturing through the simplified capacitor structure.
Data Source
AI summary
A liquid crystal display device includes: a liquid crystal panel including red, green, and blue subpixels and a viewing angle control subpixel, wherein the viewing angle control subpixel includes a lower transparent electrode formed between a shielding electrode and an upper transparent electrode, the lower transparent electrode is formed on the first substrate and connected to the upper transparent electrode, the lower transparent electrode overlaps with the shielding electrode with a first insulation film interposed therebetween to form a storage capacitor.