Transflective LCD Single Cell Gap Alignment
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Solution Overview
Problem
Conventional transflective LCDs with dual cell gaps face manufacturing complexity and control difficulties, and achieving consistent transmittance vs. voltage and reflectance vs. voltage curves is challenging with single cell gaps.
Innovation Solution
A manufacturing method for transflective LCDs using a single cell gap design with in-plane switching (IPS) and a light curable polymer alignment film, where the alignment film induces different alignment effects in transmissive and reflective regions through photopolymerization, controlling pretilt angles of liquid crystal molecules to achieve consistent curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dual cell gap design is used, then consistent transmittance and reflectance curves are achieved, but manufacturing complexity and control difficulty increase
Solution Approach 1:
The patent changes the optical parameters of the alignment film by controlling photopolymerization conditions (UV irradiation dosage, wavelength) to create different pretilt angles in transmissive and reflective regions. This allows achieving consistent transmittance and reflectance curves with a single cell gap by modifying the molecular orientation parameters rather than changing the physical cell structure
Solution Approach 2:
The alignment film is designed to have different local properties in different regions: the transmissive region receives different UV irradiation dosage compared to the reflective region, creating spatially varying pretilt angles. This local differentiation in molecular orientation achieves the desired optical consistency without requiring different cell gaps
2Device complexity
If single cell gap design is used, then manufacturing complexity is reduced, but consistent transmittance and reflectance curves are difficult to achieve
Solution Approach 1:
By adjusting photopolymerization parameters (UV intensity, exposure time, wavelength) across different regions, the patent creates the precise pretilt angle distribution needed to achieve consistent optical curves with a single cell gap, maintaining manufacturing simplicity while achieving the required precision
Solution Approach 2:
The patent replaces the mechanical approach of creating different cell gaps (physical structural differentiation) with a photochemical approach using photopolymerization-induced molecular orientation. This substitution maintains the single cell gap structure while achieving the functional differentiation needed for consistent optical performance
3Manufacturing precision
If different alignments are formed in transmissive and reflective regions, then consistent optical curves are achieved, but alignment film complexity increases
Solution Approach 1:
The alignment film is designed with spatially varying properties through selective photopolymerization: different UV irradiation dosages create different pretilt angles in transmissive versus reflective regions. This local quality differentiation achieves the required optical consistency while using a single continuous alignment film layer rather than multiple separate films
Solution Approach 2:
The patent modifies the photopolymerization parameters (light dosage, wavelength, exposure time) across different regions to create the desired alignment patterns. This parameter control approach achieves complex regional differentiation in a single film layer, avoiding the need for multiple alignment films or complex multi-layer structures
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 method simplifies the manufacturing process, reduces complexity in control circuits, and achieves consistent transmittance and reflectance curves without additional techniques, lowering production costs and enabling a wide solid angle without dual cell gap complications.
Implementation Method 1
the first alignment film may be a light curable polymer. Through photopolymerization, the first alignment film in the transmissive and reflective regions of the transflective LCD panel has different alignment effects
Implementation Method 2
Through photopolymerization, the first alignment film in the transmissive and reflective regions of the transflective LCD panel has different alignment effects on the liquid crystal molecules, thereby controlling the pretilt angles
Data Source
AI summary
A method for manufacturing a transflective LCD panel having a transmissive region and a reflective region includes steps of providing an upper substrate and a lower substrate in parallel, forming a first alignment film on the upper substrate, forming a reflective layer on the reflective region of the lower substrate, forming an first insulating layer to cover the reflective layer and the lower substrate, forming a second insulating layer to cover the first insulating layer, forming positive and negative driving electrodes wrapped in the second insulating layer, forming a coplanar second alignment film to cover the second insulating layer, packaging the upper substrate and the lower substrate, and filling liquid crystal molecules.