Liquid Crystal Display Pixel Electrode Slit Configuration
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Solution Overview
Problem
High-definition liquid crystal display devices with small pixel pitch face challenges in achieving desired transmittance due to the limited number of slits that can be formed in each pixel, which affects the control of liquid crystal alignment.
Innovation Solution
A liquid crystal display device configuration featuring a pixel electrode that extends in a specific direction with a slit above it, where both edges of the pixel electrode intersect the slit, allowing for improved control of liquid crystal alignment and transmittance, even with a small pixel pitch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel pitch is reduced to achieve high definition, then the resolution is improved, but the number of slits that can be formed in one pixel is reduced
Solution Approach 1:
The common electrode is divided into multiple slits within each pixel area. By segmenting the common electrode into a plurality of slits, the patent increases the number of effective electrode regions for liquid crystal control without requiring additional pixels, thereby maintaining high resolution while improving transmittance and liquid crystal alignment control.
2Ease of manufacture
If the number of slits is reduced due to small pixel pitch, then the manufacturing complexity is reduced, but the transmittance is insufficient
Solution Approach 1:
The patent optimizes the spatial arrangement of slits in the common electrode by extending the pixel electrode in a first direction and positioning slits to extend in the same direction with edges intersecting in a second direction. This dimensional optimization allows better utilization of the limited pixel area, improving light transmittance without increasing manufacturing complexity.
3Illumination intensity
If more slits are formed to improve transmittance, then the transmittance is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functional elements into a unified electrode structure. The common electrode with multiple slits and the pixel electrode work together as an integrated fringe field switching system, controlling liquid crystal alignment through a coordinated electric field pattern. This merging approach achieves improved transmittance while avoiding the complexity of multiple independent electrode systems.
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 allows for miniaturization of pixels while maintaining efficient liquid crystal alignment, reducing unnecessary electric fields and lowering drive voltage.
Implementation Method 1
A lateral electric field is applied between the common electrode and the pixel electrode to control the alignment of the liquid crystal layer
Implementation Method 2
controls liquid crystal in a fringe electric field
Data Source
AI summary
A liquid crystal display device includes: first and second substrates; a liquid crystal layer interposed between the first and second substrates; a switching element provided on the first substrate; a first pixel electrode provided on the first substrate and electrically connected to a drain electrode of the switching element; an insulating film provided on the first pixel electrode; and a common electrode provided on the insulating film and including a first slit. The first pixel electrode extends in a first direction. The first slit extends in the first direction and is located above the first pixel electrode. In a planar view, both edges of the first pixel electrode in a second direction intersecting the first direction are located inside the first slit.