Liquid Crystal Display Electrode Segmentation for Transmissivity
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Solution Overview
Problem
IPS-type liquid crystal display devices suffer from insufficient optical transmissivity due to non-overlapping linear pixel and counter electrodes, while IPS-Pro-type devices have high transmissivity but with increased dark lines, and both types face challenges in covering drain signal lines without compromising optical performance.
Innovation Solution
A liquid crystal display device configuration that combines IPS-type and IPS-Pro-type structures within a pixel region, with specific electrode widths and arrangements to enhance overall optical transmissivity, including setting pixel electrode widths to 4.0 μm or less and counter electrode widths to 2.5 μm or less, and alternating their arrangement to prevent overlap and optimize electric field distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If linear pixel electrodes and counter electrodes are arranged in a non-overlapping manner (IPS-type structure), then the structure is simple and manufacturing is easier, but optical transmissivity is insufficient due to regions above electrodes where liquid crystal cannot be sufficiently driven
Solution Approach 1:
The pixel region is divided into multiple sub-regions, with different electrode arrangement patterns applied to different sub-regions. Specifically, some sub-regions use non-overlapping IPS-type structure while others use overlapping IPS-Pro-type structure, allowing optimization of both manufacturing simplicity and optical transmissivity in different areas
Solution Approach 2:
Different parts of the pixel region are assigned different electrode structures based on local requirements. Regions requiring high optical transmissivity use overlapping electrode structures, while regions prioritizing manufacturing simplicity use non-overlapping structures, creating local optimization throughout the display panel
2Illumination intensity
If pixel electrode and counter electrode are arranged in an overlapping manner (IPS-Pro type), then optical transmissivity is improved, but dark lines appear and the number of portions with low optical transmissivity increases
Solution Approach 1:
The display panel is segmented into multiple pixel regions with different electrode arrangement patterns. By distributing overlapping and non-overlapping structures across different sub-regions, the harmful dark lines are localized and their overall impact is reduced while maintaining high optical transmissivity in overlapping regions
Solution Approach 2:
The electrode arrangement is made asymmetric across different sub-regions rather than using a uniform pattern throughout. This allows the design to exploit the advantages of overlapping structures in some areas while compensating for dark line issues in other areas, achieving overall optimization
3Reliability
If counter electrode line width is increased to cover drain signal lines, then electric field leakage is prevented, but optical transmissivity in those portions becomes insufficient
Solution Approach 1:
The counter electrode structure is segmented into different width configurations across different sub-regions. In regions where drain signal line coverage is critical, wider counter electrodes are used to prevent electric field leakage, while in other regions narrower electrodes are used to maintain high optical transmissivity
Solution Approach 2:
The counter electrode width is locally optimized based on functional requirements. Areas requiring electric field containment have wider electrodes, while areas prioritizing light transmission have narrower electrodes, creating a spatially varying electrode width profile that satisfies both requirements
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
The proposed configuration significantly enhances optical transmissivity by reducing dark lines and improving liquid crystal molecule driving, while effectively covering drain signal lines to prevent electric field leakage, resulting in improved display performance.
Implementation Method 1
the liquid crystal layer is configured to be driven by an electric field generated due to difference in potential between the pixel electrode and the counter electrode
Implementation Method 2
a liquid crystal layer which is sandwiched between the first substrate and the second substrate
Data Source
AI summary
A liquid crystal display device which can enhance optical transmissivity is provided. One pixel region is divided into a first pixel region, a second pixel region and a third pixel region in order from one video signal line to another video signal line, the first pixel region and the third pixel region adopt the so-called IPS-Pro type structure, and the second pixel region adopts the so-called IPS structure in narrow meaning. A line width of linear electrode in the second pixel region is set to 2.5 μm or less.