Optimized Insulating Films for High-Quality Displays
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Summary
Problems
Liquid crystal display devices face challenges in maintaining high transmissivity and color purity due to interference effects caused by the thickness variations of insulating films, which can lead to decreased luminosity and display quality.
Innovation solutions
The display device is designed with specific thickness optimizations for insulating films, particularly the fourth and fifth insulating films, to minimize interference effects, using silicon nitride and silicon oxide materials, and ensuring uniform or differentiated thicknesses for different color filter layers to achieve high transmissivity across red, green, and blue pixels.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If insulating films are made thinner to increase light transmissivity, then luminosity improves, but interference effects increase causing color mixing and degraded color purity
Why choose this principle:
The patent divides the insulating film structure into multiple separate films (first insulating film 11, second insulating film 12, third insulating film 13, fourth insulating film 14, fifth insulating film 15, sixth insulating film 16) with different materials and thicknesses. This segmentation allows each film to be optimized independently – thinner films for transmissivity and specific thickness combinations to control interference effects, thereby resolving the contradiction between luminosity and color purity.
Principle concept:
If multiple insulating films with different thicknesses are used to control interference, then color purity improves, but manufacturing complexity increases
Why choose this principle:
The patent applies local quality by assigning different materials (silicon nitride for films 11, 14, 16 and silicon oxide for films 12, 13, 15) and different thickness ranges to specific insulating films based on their functional requirements. This localized optimization controls interference effects at each interface while maintaining overall manufacturing feasibility through systematic material assignment.
Application Domain
Data Source
AI summary:
The display device is designed with specific thickness optimizations for insulating films, particularly the fourth and fifth insulating films, to minimize interference effects, using silicon nitride and silicon oxide materials, and ensuring uniform or differentiated thicknesses for different color filter layers to achieve high transmissivity across red, green, and blue pixels.
Abstract
According to one embodiment, a display device includes an insulating substrate, a first insulating film, a second insulating film, a third insulating film, a fourth insulating film, a fifth insulating film, a sixth insulating film, a color filter layer, a semiconductor layer disposed between the second insulating film and the third insulating film, and a gate electrode disposed between the third insulating film and the fourth insulating film, wherein the first, fourth, and sixth insulating films are formed of a silicon nitride, and the second, third, and fifth insulating films are formed of a silicon oxide.