IPS Liquid Crystal Display Electrode Slit Orientation for Response Time
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Solution Overview
Problem
Liquid crystal display devices in the In-Plane Switching (IPS) mode face challenges in achieving high transmittance and fast response time simultaneously, particularly at low temperatures, due to the limitations of existing electrode structures.
Innovation Solution
The design incorporates a liquid crystal display device with specific electrode configurations, including slits on upper electrodes that extend in different directions, and a matrix arrangement of pixels with sub-pixels, each connected to thin film transistors, to optimize transmittance and response time by controlling the alignment of liquid crystal molecules through electric fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional IPS mode electrode structure is used, then the liquid crystal display device achieves wide viewing angle, but the response time is slow particularly at low temperatures
Solution Approach 1:
The upper electrode is divided into multiple segments with slits in different directions (first upper electrodes with slits in first direction, second upper electrodes with slits in second direction). This segmentation allows different regions to apply electric fields in optimized directions, improving response time without sacrificing wide viewing angle characteristics of IPS mode
Solution Approach 2:
Different regions of the electrode structure have different slit orientations tailored to local requirements. The first and second upper electrodes have slits extending in different directions, creating locally optimized electric field distributions that enhance response speed while maintaining overall IPS mode performance
2Speed
If the electrode structure is modified to improve response time, then fast-response characteristics are achieved, but transmittance decreases
Solution Approach 1:
The electrode is segmented into multiple upper electrodes with slits in different directions rather than a single continuous electrode. This segmentation reduces the overall electrode area blocking light while maintaining sufficient electric field application capability, thus improving transmittance without sacrificing response time
Solution Approach 2:
Instead of modifying electrode structure in a single dimension, the invention introduces multi-directional slit orientations (first direction and second direction) to create electric field components in multiple dimensions. This dimensional approach optimizes both light transmission and molecular alignment efficiency
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 enhances transmittance and response speed, allowing for high-quality moving images even at low temperatures, while also reducing power consumption and increasing luminescence by selectively activating sub-pixels based on ambient temperature.
Implementation Method 1
a liquid crystal driving mode that rotates liquid crystal molecules in a planar direction via a horizontal (in-plane) electric field
Implementation Method 2
rotates liquid crystal molecules in a planar direction via a horizontal (in-plane) electric field, thus rotating an effective optical axis within a plane
Data Source
AI summary
A liquid crystal display device includes a lower electrode and a plurality of upper electrodes opposed to the lower electrode formed in the first substrate. At least one first upper electrode and at least one second upper electrode of the plurality of upper electrodes are formed in each of the plurality of pixels. Each of the first upper electrodes has a plurality of slits that extend in a first direction, each of the second upper electrodes has a plurality of slits that extend in a second direction which is different from the first direction, and the first and second upper electrodes are electrically isolated from each other.