Liquid Crystal Display Electrode Slit Width Optimization
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Solution Overview
Problem
Liquid crystal displays with vertically aligned mode suffer from increased electric field distortion due to narrow slits in electrodes, leading to deteriorated transmittance and response time.
Innovation Solution
A liquid crystal display design featuring a second electrode with branches and a slit between them, where the slit width is more than two times to less than five times the width of the branches, and a method of applying different voltages to the electrodes to flatten the electric field, ensuring alignment directions of liquid crystal molecules differ between regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the width of the minute slit is designed to be small to apply common voltage to the entire panel, then the ease of operation is improved, but the distortion of the electric field is increased
Solution Approach 1:
The patent applies different voltage values to different regions of the electrode structure. Specifically, a first voltage is applied to the first electrode and a second voltage is applied to the second electrode, where the first voltage is greater than or equal to the second voltage. This local differentiation of electrical properties compensates for the electric field distortion caused by the narrow slit structure, allowing uniform liquid crystal alignment across the entire panel while maintaining the common voltage application benefit.
2Device complexity
If the width of the minute slit is designed to be small, then the device complexity is reduced, but the transmittance is deteriorated
Solution Approach 1:
The patent changes the electrical parameters (voltage values) applied to different electrodes to compensate for the physical constraints of the narrow slit structure. By applying a first voltage to the first electrode and a second voltage to the second electrode, with the first voltage being greater than or equal to the second voltage, the electric field distribution is optimized to improve liquid crystal alignment uniformity, thereby improving transmittance without changing the physical electrode structure.
3Manufacturing precision
If the width of the minute slit is designed to be small, then the manufacturing precision is improved, but the response time is deteriorated
Solution Approach 1:
The patent optimizes response time by changing the electrical parameters applied to the electrodes. By applying different voltage values (first voltage to the first electrode, second voltage to the second electrode, where first voltage ≥ second voltage), the electric field strength is optimized to improve liquid crystal alignment speed and uniformity, thereby reducing response time while maintaining the precisely controlled narrow slit structure.
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 design reduces electric field distortion and improves response speed by ensuring uniform alignment and reduced transmittance loss.
Implementation Method 1
The liquid crystal display generates an electric field in the liquid crystal layer by applying a voltage to the field generating electrodes
Implementation Method 2
control polarization of incident light
Implementation Method 3
an alignment layer disposed on at least one of the second electrode and the third electrode... at least one of the liquid crystal layer and the alignment layer may further include an alignment assistance agent
Data Source
AI summary
A liquid crystal display and a manufacturing method are provided. A liquid crystal display according to an exemplary embodiment of the present invention includes: a first substrate; a second substrate facing the first substrate; a liquid crystal layer interposed between the first substrate and the second substrate, and including liquid crystal molecules; a first electrode positioned on the first substrate; an insulating layer positioned on the first electrode; a second electrode positioned on the insulating layer; and a third electrode positioned on the second substrate, wherein the second electrode includes a plurality of branches and a slit between neighboring ones of the branches, and a width of the slit is more than about two times to less than about five times a width of its corresponding branches.