LCD Sub-Pixel Pretilt Angle Control via Multi-Voltage Alignment
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Solution Overview
Problem
The existing manufacturing methods for liquid crystal displays (LCDs) require additional time and equipment for initial alignment, increasing costs and reducing productivity, as they apply voltage to each cell separately, and typically set equal pretilt angles for sub-pixel electrodes, which does not adequately address lateral visibility issues in vertical alignment mode LCDs.
Innovation Solution
The method involves applying voltage to a mother panel glass unit including multiple cells without an initial alignment step, differentiating the pretilt angles of liquid crystal molecules in sub-pixel areas by using a multi-layered structure with separate voltage application units and regions on the display panels, allowing for distinct initial pretilt angles between sub-pixel electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If voltage is applied to each cell separately for initial alignment, then the initial alignment of liquid crystal molecules can be achieved, but additional time and equipment are required which lowers productivity
Solution Approach 1:
The patent merges multiple cells into a single mother panel glass for simultaneous voltage application and ultraviolet exposure during initial alignment. This combining approach allows all cells to undergo the alignment process together, eliminating the need for separate processing of each cell, thereby maintaining alignment accuracy while significantly improving productivity.
Solution Approach 2:
The invention makes the mother panel glass serve multiple functions: it acts as both the substrate for multiple cells and as a unified structure for simultaneous voltage application and ultraviolet exposure. This multi-functionality allows the same structure to achieve initial alignment across all cells without requiring additional equipment or time for each individual cell.
2Ease of manufacture
If the same voltage is applied to two sub-pixel electrodes in one pixel, then the manufacturing process is simplified, but the initial pretilt angles of liquid crystal molecules in sub-pixel areas become equal which does not adequately address lateral visibility issues
Solution Approach 1:
The patent applies different voltages to different sub-pixel electrodes within the same pixel, creating local variations in the electric field. This local quality approach allows each sub-pixel area to develop distinct initial pretilt angles tailored to its specific position and function, thereby improving lateral visibility while maintaining a relatively simple manufacturing process.
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 manufacturing costs and improves the initial alignment accuracy of liquid crystal molecules, enhancing the transmittance and lateral visibility of LCDs by applying different voltages to distinct regions of the display panel.
Implementation Method 1
a vertically aligned mode LCD in which a long axis of the liquid crystal molecules is arranged to be vertical to a surface of a display panel in a state in which an electric field is not applied
Implementation Method 2
voltages are supplied to electrodes to realign liquid crystal molecules of a liquid crystal layer so that an amount of transmitted light is adjusted
Implementation Method 3
in a method in which a prepolymer that is polymerized by light such as ultraviolet rays is used to provide the pretilt to liquid crystal molecules
Data Source
AI summary
A liquid crystal display includes a first substrate, pixel electrodes disposed on the first substrate and including a first sub-pixel electrode and a second sub-pixel electrode separated from each other and positioned in one pixel area, gate lines connected to the pixel electrodes, data lines connected to the pixel electrodes, reference voltage lines connected to the second sub-pixel electrode of the pixel electrodes, a second substrate facing the first substrate, a common electrode disposed on the second substrate, and a liquid crystal layer positioned between the first substrate and the second substrate and including liquid crystal molecules, a first initial pretilt angle of the liquid crystal molecules corresponding to the first sub-pixel electrode for the second substrate surface is larger than a second initial pretilt angle of the liquid crystal molecules corresponding to the second sub-pixel electrode for the second substrate surface.