Array Substrate Groove Structure for LCD Light Transmission
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Solution Overview
Problem
Conventional liquid crystal display (LCD) panels with vertical alignment mode suffer from color washout and reduced light transmission rates due to disorderly alignment of liquid crystal molecules, especially at large viewing angles, caused by the step-like edge structure of pixel electrodes.
Innovation Solution
The array substrate features a pixel structure with a passivation layer having a groove structure and a second groove surrounding the rim, where the pixel electrode covers recess and protrusion portions with edges extending into the second groove, ensuring uniform alignment of liquid crystal molecules by tilting angles in different fields, thereby stabilizing their alignment and enhancing light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pixel electrode has a step-like edge structure, then the manufacturing process is simple, but the liquid crystal molecules align disorderly causing reduced light transmission rate
Solution Approach 1:
The pixel electrode edge is segmented into multiple regions with different tilting angles (first, second, third, and fourth regions corresponding to different quadrants). Each region has groove structures with specific tilting angles that guide liquid crystal molecule alignment in different directions, preventing disorderly alignment while maintaining manufacturing feasibility through systematic patterning.
Solution Approach 2:
Different regions of the pixel electrode edge are assigned different local properties - specifically, different tilting angles of groove structures in different quadrants. The first and second regions have grooves tilting at a first angle, while the third and fourth regions have grooves tilting at a second angle, creating locally optimized alignment for each region to prevent overall disorder.
2Adaptability or versatility
If multi-domain pixel structure is adopted to solve color washout, then the viewing angle performance is improved, but the liquid crystal molecule alignment becomes complex and may cause disorder
Solution Approach 1:
The groove structures in different quadrants are designed with asymmetric tilting angles relative to the pixel center. The first and second regions have grooves tilting at one angle, while the third and fourth regions have grooves tilting at a different angle, creating an asymmetric pattern that systematically controls liquid crystal alignment across different viewing domains while maintaining overall stability.
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 stabilizes the alignment of liquid crystal molecules, reducing disorder and enhancing the light transmission rate of the liquid crystal panel, particularly at large viewing angles.
Implementation Method 1
the liquid crystal molecules may align differently. With respect to the liquid crystal panel, the alignment of the liquid crystal molecules begins from the center of the pixel electrode and then the liquid crystal molecules in a rim may tilt
Implementation Method 2
This configuration stabilizes the alignment of liquid crystal molecules, reducing disorder and enhancing the light transmission rate of the liquid crystal panel
Data Source
AI summary
The array substrate includes a plurality of pixel structures, each of the pixel structure comprising thin film transistor (TFTs) and a pixel electrodes on a glass substrate. A passivation layer is arranged between the TFT and the pixel electrode. The pixel electrode electrically connects to the TFT via a through hole of the passivation layer. The passivation layer includes a groove structure having a plurality of recess portions arranged periodically and at least one protrusion portion between every two adjacent recess portions. The passivation layer includes a second groove surrounding a rim of the groove structure. The second groove connects the plurality of the recess portions. The pixel electrode is substantially a surface covering the recess portions and the protrusion portions, and edges of the pixel electrode extend into the second groove. In addition, a liquid crystal panel includes the above array substrate is also disclosed.