Phase Plate Surface Melting Prevention in Liquid Crystal Displays
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Solution Overview
Problem
In liquid crystal display devices, phase plates fail to fully exhibit their functions due to the melting of their surface caused by the liquid solution used in forming the orientation film after the phase plates are set.
Innovation Solution
A liquid crystal display device configuration where a phase plate is formed on the liquid-crystal side surface of one substrate, covered with color filters, and a protrusive film and reflective electrode are formed in increasing amounts from the periphery of the phase plate, with color filters being thinner over the phase plate regions, preventing the orientation film from being formed on the phase plate and thus avoiding surface melting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the orientation film is formed after the phase plate is set, then the liquid crystal display device can be manufactured with standard processes, but the liquid solution melts the surface of the phase plate causing it to fail to fully exhibit its functions
Solution Approach 1:
The phase plate is formed on the liquid-crystal side surface of the substrate before the color filters are formed. This preliminary positioning allows the phase plate to be protected from the orientation film liquid solution, as the color filters will subsequently cover the phase plate area, preventing the liquid solution from contacting and melting the phase plate surface.
Solution Approach 2:
The color filters serve as an intermediary protective layer between the phase plate and the orientation film liquid solution. By forming the color filters over the phase plate, they act as a barrier that prevents the liquid solution from directly contacting the phase plate surface, thus avoiding melting while allowing the manufacturing process to proceed with standard orientation film formation.
2Reliability
If the phase plate is covered with color filters, then the phase plate surface is protected from melting, but the structure becomes more complex
Solution Approach 1:
The color filters perform multiple functions: they provide their primary function of color filtering for the display, and simultaneously serve as a protective layer over the phase plate during the orientation film formation process. This multi-functionality eliminates the need for additional protective layers, maintaining structural simplicity while ensuring phase plate protection.
Solution Approach 2:
The protective function and the color filtering function are merged into a single component - the color filter layer. Instead of having separate protective and filtering layers, the color filters are designed to fulfill both roles, reducing the overall number of layers and simplifying the device structure while achieving phase plate protection.
3Illumination intensity
If color filters are made thinner over the phase plate regions, then light transmission is optimized, but manufacturing precision requirements increase
Solution Approach 1:
The color filters have different thicknesses in different regions: they are formed thinner in the regions overlapping the phase plate to optimize light transmission, and maintain standard thickness in other regions. This local variation in thickness is achieved through selective formation processes and allows optimization of optical performance in specific areas without compromising overall manufacturing feasibility.
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 allows the phase plate to fully function by preventing surface melting and ensuring optimal light transmission and reflection, maintaining color tones without additional manufacturing steps and enhancing light containment within pixel regions.
Implementation Method 1
phase plates or phase shifters are disposed on surfaces located opposite to the liquid-crystal sides of substrates
Implementation Method 2
color filters are successively formed in the regions of the optically transmissive and reflective portions
Implementation Method 3
a reflective electrode is formed in regions of the optically reflective portions of the liquid-crystal side surface of the other substrate
Data Source
AI summary
There is disclosed a liquid crystal display device having two substrates which are placed opposite to each other with a liquid crystal material sandwiched therebetween. A phase plate is formed on the liquid-crystal side surface of one of the substrates. The phase plate is covered with color filters.