IPS Liquid Crystal Display Bent Electrode Uniformity
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Solution Overview
Problem
In-plane Switching (IPS) type liquid crystal display devices with bent electrodes suffer from non-uniform orientation of liquid crystal molecules under strong electric fields, leading to display unevenness due to differing electric field orientations between the bent sections of the electrodes.
Innovation Solution
The liquid crystal display device employs a pair of substrates with a liquid crystal layer and a matrix of first and second electrodes, where the second electrodes generate a transversal electric field by overlapping with first electrodes, and are designed with specific slit and notch configurations to maintain uniform liquid crystal orientation even under strong electric fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If bent electrodes are used to generate strong electric fields, then liquid crystal switching performance is improved, but liquid crystal molecule orientation becomes non-uniform causing display unevenness
Solution Approach 1:
The second electrode is divided into multiple independent electrode sections arranged in a matrix pattern, with each section corresponding to a pixel region. This segmentation allows independent control of electric field distribution in different areas, preventing the non-uniform orientation problems that occur with continuous bent electrodes under strong electric fields.
Solution Approach 2:
Different regions of the electrode structure are designed with different properties: the first electrode uses transparent conductive films with specific slit patterns for uniform field distribution, while the second electrode uses opaque conductive films with segmented patterns for localized control. This local differentiation optimizes both switching performance and orientation uniformity in respective regions.
2Power
If second electrodes are positioned closer to the first substrate, then electric field efficiency is improved, but interference with thin film transistors increases
Solution Approach 1:
The second electrode is segmented into multiple small electrode sections with spacing between them, rather than forming a continuous layer. This segmentation reduces the overall interference with underlying thin film transistors while maintaining sufficient electric field efficiency for liquid crystal switching in each pixel region.
Solution Approach 2:
The electrode structure exhibits asymmetric design where the first electrode (transparent) and second electrode (opaque) are positioned at different distances from the liquid crystal layer and have different patterns. This asymmetry allows optimization of electric field efficiency without excessive interference with TFTs, as the opaque second electrode can be positioned closer without causing uniform interference across the entire substrate.
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 ensures uniform liquid crystal molecule orientation, preventing display unevenness and maintaining image quality across a wide viewing angle without reversing the pretilt orientation caused by the aligning treatment.
Implementation Method 1
a plurality of second electrodes that are arranged in isolation from the plurality of first electrodes so as to be closer to the first substrate than the plurality of first electrodes, wherein the plurality of second electrodes generate a transversal electric field between the plurality of first and second electrodes for changing the orientations of the long axes of the liquid crystal molecules within a plane that is substantially parallel with the surfaces of the substrates
Implementation Method 2
a liquid crystal layer interposed in the gap between the pair of substrates with long axes of liquid crystal molecules in alignment with the direction of the aligning treatment
Data Source
AI summary
A liquid crystal display device comprises a pair of substrates subjected to an aligning treatment in mutually parallel but opposite directions, a liquid crystal layer interposed between the pair of substrates, a first electrode bent into a “<” shape, and a second electrode formed via an insulating film with the first electrode. The first electrode comprises one linear section and another linear section that extend in directions that intersect the alignment treatment direction at different angles, a bent section that is provided at each end where the one linear section and the other linear section adjacent to each other and that extends in a direction that intersects the alignment treatment direction at an angle that is greater than each of the intersecting angles of the one linear section and the other linear section and the alignment treatment direction with respect to the alignment treatment directions.