Strip-Shaped Common Electrodes for Uniform Electric Fields in HADS Displays
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Solution Overview
Problem
In Higher Aperture Advanced Super Dimension Switch (HADS) type liquid crystal display devices, non-uniform electric fields are created at the edge of sub-pixels due to the turning of common electrodes, leading to dark state regions and adverse effects on transmittance and display quality.
Innovation Solution
The array substrate design features a common electrode with first strip-shaped sub-electrodes that run through the entire display region, connected by a common electrode line, arranged in parallel with data lines and avoiding overlap with thin film transistors to ensure a uniform electric field, and the pixel electrode is positioned closer to the substrate than the common electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the common electrode is designed with turning at the edge of sub-pixels, then the electrode can be connected to the common electrode line, but non-uniform electric fields are created leading to dark state regions and reduced transmittance
Solution Approach 1:
The common electrode is segmented into multiple first strip-shaped sub-electrodes arranged in parallel, each running through the display region. This segmentation eliminates the need for turning at edges while maintaining electrical connection through the common electrode line, thereby resolving the contradiction between ease of manufacture and transmittance.
Solution Approach 2:
The common electrode structure transitions from a planar design with turning to a three-dimensional arrangement where strip-shaped sub-electrodes extend through the display region in parallel. This dimensional change allows direct connection to the common electrode line without edge turning, eliminating dark state regions and improving transmittance.
2Illumination intensity
If the common electrode runs through the entire display region in parallel strips, then uniform electric field is achieved, but the structure becomes more complex
Solution Approach 1:
The first strip-shaped sub-electrodes serve multiple functions: they create uniform electric fields across the display region, provide direct connection paths to the common electrode line, and eliminate the need for complex turning structures. This multi-functionality resolves the contradiction between transmittance improvement and structural complexity.
3Stability of the object's composition
If the first strip-shaped sub-electrodes are arranged in parallel with data lines, then uniform electric field is maintained, but overlap with thin film transistors must be avoided
Solution Approach 1:
The first strip-shaped sub-electrodes are positioned to have different local relationships with underlying structures: they overlap with data lines to maintain electric field uniformity, while avoiding overlap with thin film transistor active layers to prevent interference. This localized quality differentiation resolves the contradiction between electric field uniformity and device complexity.
Data Source
AI summary
An array substrate, a method for fabricating the same, and a display device are disclosed. The array substrate comprises a plurality of sub-pixels in a display region which are defined by gate lines and data lines intersecting with each other. The array substrate further comprises a common electrode and a pixel electrode on the substrate. The common electrode comprises a plurality of first strip-shaped sub-electrodes, wherein each of the first strip-shaped sub-electrodes runs through the display region; and a common electrode line which electrically connects all of the first strip-shaped sub-electrodes.