Multilayer Liquid Crystal Display With Side Surface Wiring
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Solution Overview
Problem
The existing multilayer liquid crystal display elements for electronic paper face challenges in reducing the number of components and connecting points, leading to high component costs and low reliability, particularly in the fabrication process where multiple panels are layered, and the use of film substrates is limited due to high temperature processes.
Innovation Solution
A multilayer display element configuration with reduced FPCs and drive ICs, where data and scanning electrode layer-to-layer interconnects are formed in non-display areas, allowing for connection after panels are placed in layers, and using side surface wiring with conductive paste to interconnect electrodes at low temperatures, enabling the use of film substrates without increasing the picture frame area or degrading brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple liquid crystal display panels are layered to achieve color representation, then color display capability is improved, but the number of components and connecting points increases leading to higher costs and lower reliability
Solution Approach 1:
The patent combines multiple liquid crystal display panels (red, green, blue) into a single integrated multilayer display element with shared substrate structures and integrated electrode connections. This merging approach maintains color display capability while reducing the total number of separate components and connecting points compared to assembling three independent panels.
Solution Approach 2:
The patent creates a universal substrate structure that serves multiple functions: supporting multiple liquid crystal layers, providing common electrode connections, and enabling integrated drive circuitry. This multi-functional design reduces the need for separate support structures and connection mechanisms for each panel layer.
2Manufacturing precision
If high temperature processes are used in fabrication, then manufacturing precision is improved, but film substrate usage is limited due to temperature constraints
Solution Approach 1:
The patent changes the temperature parameter in the fabrication process by using low-temperature conductive paste formulation and low-temperature firing techniques. This parameter change enables the use of film substrates that would be damaged by high-temperature processes, expanding substrate material options while maintaining adequate manufacturing precision for electrode formation.
3Ease of manufacture
If the picture frame area is increased to accommodate wiring, then ease of manufacture is improved, but display area and brightness are reduced
Solution Approach 1:
The patent moves wiring connections from the planar display area into the vertical dimension by forming electrodes and conductive structures on the side surfaces of the liquid crystal panels. This dimensional transition allows wiring to be accommodated without increasing the picture frame area, preserving display area while maintaining manufacturing ease.
Solution Approach 2:
The patent nests conductive paste wiring structures within the existing panel structure by forming electrodes on side surfaces and integrating connections within the layered construction. This nesting approach incorporates necessary wiring elements without adding external picture frame area, keeping the display compact while maintaining ease of manufacture.
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 approach reduces the number of components and connecting points, lowers production costs, enhances reliability, and allows for the use of film substrates, maintaining high-density pixel arrangements without brightness degradation, while simplifying the fabrication process and enabling layering of multiple panels.
Implementation Method 1
side surface wiring with conductive paste to interconnect electrodes
Implementation Method 2
low temperatures, enabling the use of film substrates
Implementation Method 3
Cholesteric liquid crystals are selective reflective liquid crystals of bistable properties using the interference reflection of a liquid crystal layer
Implementation Method 4
The cholesteric liquid crystals have properties that two stable states, the planar (planer) state and the focal conic (focal conic) state, are held for a long time after an electric field is removed. In the cholesteric liquid crystals, the incident light is interfered and reflected in the planar state
Data Source
AI summary
A multilayer liquid crystal display element has a plurality of data electrode layer-to-layer interconnects formed in a non-display area of a liquid crystal display panel for connecting data electrodes of liquid crystal display panels for R, G, and B to a plurality of data signal input terminals from layer to layer, and a plurality of scanning electrode layer-to-layer interconnects formed in the non-display area for connecting scanning electrodes of the liquid crystal display panels for R, G, and B to a plurality of scan signal input terminals from layer to layer.