Comb-Shaped Electrode Design for LCD Response Speed
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Solution Overview
Problem
In liquid crystal display devices using horizontal electric fields, the response speed of liquid crystal molecules is limited, leading to slower display performance compared to vertical electric field types like FFS mode, where liquid crystal molecules are harder to drive near the electrodes.
Innovation Solution
A liquid crystal display device design featuring a first and second electrode configuration with comb-shaped portions that protrude from an electrode base, where the width at the protrusion start is less than half the array pitch, enhancing the electric field distribution and response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional electrode configuration is used in horizontal electric field type liquid crystal display, then the device structure is simple, but the response speed of liquid crystal molecules is slow
Solution Approach 1:
The electrode is divided into multiple comb-shaped portions that protrude from the electrode base portion, creating multiple electric field generation regions. This segmentation allows the electric field to be more effectively distributed across the liquid crystal layer, improving the response speed by enabling more uniform and rapid molecule rotation throughout the display area.
Solution Approach 2:
The electrode structure transitions from a flat two-dimensional configuration to a three-dimensional structure with protruding comb-shaped portions. This dimensional change allows the electric field to penetrate deeper into the liquid crystal layer and creates more effective electric field distribution, thereby improving response speed without significantly increasing overall device complexity.
2Speed
If the width of comb-shaped portions at protrusion start is large, then the electric field generation area is increased, but the aperture ratio is reduced
Solution Approach 1:
The patent optimizes the width parameter of the comb-shaped portions at the protrusion start position, setting it to be smaller than half the array pitch. This parameter optimization creates a balance where the electric field generation effectiveness is maximized while the aperture ratio is maintained at acceptable levels, achieving improved response speed without excessive sacrifice to light transmission area.
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 improves the response speed of liquid crystal molecules by allowing them to rotate more quickly in response to voltage changes, outperforming traditional IPS mode by enabling faster transmittance shifts and maintaining high luminance uniformity.
Implementation Method 1
a liquid crystal display device using a horizontal electric field type... generate an electric field between the first electrode and the second electrode and in a direction parallel to the substrate to thereby rotate the liquid crystal molecules in plane parallel to the substrate surface
Implementation Method 2
rotate the liquid crystal molecules in plane parallel to the substrate surface, and to perform a display using a change in light transmittance corresponding to the rotation of the liquid crystal molecules
Data Source
AI summary
According to an aspect, a liquid crystal display device includes: a first substrate and a second substrate that face each other; a liquid crystal layer provided between the first substrate and the second substrate; and a first electrode and a second electrode provided between the first substrate and the liquid crystal layer. The first electrode includes: an electrode base portion that extends in a first direction; and a plurality of comb-shaped portions that protrude from the electrode base portion at a fixed distance away from each other, and extend in a second direction different from the first direction. Each of the comb-shaped portions is configured such that a width thereof at a protrusion start position of the electrode base portion is smaller than a number obtained by multiplying an array pitch of adjacent comb-shaped portions by 0.5.