V-Shaped Slit Electrode for High-Definition LCD Viewing Angles
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Solution Overview
Problem
Existing liquid crystal display devices using lateral electric field modes face challenges in achieving high definition and wide viewing angles while maintaining low transmissivity and response speed, particularly in compact devices like cellular phones and PDAs.
Innovation Solution
A liquid crystal display device with a V-shaped slit pixel electrode and a double-gate thin film transistor structure, where the slit electrodes are aligned to generate a lateral electric field that changes the liquid crystal molecule alignment direction, allowing for multi-domain formation and improved light modulation, combined with a poly-silicon semiconductor layer for enhanced response speed and reduced OFF current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lateral electric field modes are used, then device complexity is reduced, but definition and viewing angle are insufficient
Solution Approach 1:
The pixel electrode is divided into multiple independent slit electrodes arranged in specific patterns (e.g., interdigitated or radial configurations). Each slit electrode acts as an independent electric field generator, enabling precise control of liquid crystal orientation in different regions. This segmentation achieves high definition displays while maintaining manageable device complexity through modular electrode design.
Solution Approach 2:
Different regions of the pixel electrode are designed with locally optimized slit electrode configurations. For example, radial slit patterns are used in central regions for uniform alignment, while interdigitated patterns are applied at edges for enhanced viewing angles. This local quality approach allows each region to perform its specific function optimally, achieving both high definition and wide viewing angles without excessive overall complexity.
2Adaptability or versatility
If multi-domain formation is implemented, then viewing angle is improved, but transmissivity is reduced
Solution Approach 1:
The slit electrodes are designed with asymmetric configurations relative to the pixel center, such as radial patterns that extend preferentially toward certain directions or interdigitated patterns with unequal spacing. This asymmetry creates multiple distinct domains with different orientation directions, achieving wide viewing angles. The asymmetric design is optimized to minimize interference between domains, thereby reducing transmissivity loss while maintaining multi-domain functionality.
3Speed
If response speed is increased, then device performance is improved, but power consumption increases
Solution Approach 1:
The slit electrode configuration enables dynamic control of electric field distribution across the pixel. By adjusting the voltage applied to different slit electrode groups, the liquid crystal orientation can be rapidly reconfigured between different states. This dynamic control achieves fast response speeds while allowing the system to operate in low-power modes when full performance is not required, optimizing the balance between response speed and power consumption.
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 solution achieves high definition displays with minimal transmissivity reduction, enabling wide viewing angles and improved response speed suitable for compact devices like cellular phones and PDAs.
Implementation Method 1
performs switching of liquid crystal molecules using the lateral electric filed substantially parallel with a principal surface of the array substrate
Implementation Method 2
a first alignment film covering the second electrode and processed by rubbing treatment in a first rubbing direction
Implementation Method 3
a first alignment film covering the second electrode and processed by rubbing treatment in a first rubbing direction in parallel with a second direction orthogonally crossing the first direction
Implementation Method 4
combined with a poly-silicon semiconductor layer for enhanced response speed and reduced OFF current
Data Source
AI summary
In one embodiment, a liquid crystal display device includes a first substrate and a second substrate. The first substrate includes a switching element, a first electrode, a second electrode electrically connected with the switching element and facing the first electrode. In the second electrode, a plurality of slits in a V shape is formed along a first direction. The first and second substrates include first and second alignment films, respectively. The slit in the V shape includes a central portion, a first end connected with one end of the first central portion, a second end connected with the other end of the first central portion, a second central portion, a third end connected with one end of the second central portion, and a fourth end connected with the other end of the second central portion. The first end and the third end are connected each other.