Array Substrate Recess Structure for Storage Capacitance
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Solution Overview
Problem
The deflection of liquid crystals in liquid crystal display devices is degraded due to reduced voltage of the storage capacitor between the common electrode and the pixel electrode.
Innovation Solution
An array substrate design featuring a base substrate with a first electrode and a second electrode, where the second electrode has recesses recessing towards the base substrate, increasing the storage capacitance without reducing light transmission, and the electrodes are configured such that the first electrode and second electrode are either a common electrode and a pixel electrode or vice versa, with specific insulating layers and recess configurations to enhance capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the storage capacitance between the common electrode and pixel electrode is increased, then the voltage for controlling liquid crystal deflection is improved, but the light transmission is reduced
Solution Approach 1:
The patent introduces a recess structure that extends in the depth dimension (perpendicular to the substrate surface), transforming a two-dimensional electrode plane into a three-dimensional structure. This allows increasing the storage capacitance by adding volume in the depth direction without increasing the lateral area that would block light transmission.
Solution Approach 2:
The recess structure nests the common electrode and pixel electrode within each other's projected area. The electrodes are positioned such that one electrode is partially or fully contained within the lateral boundaries of the other electrode when viewed from above, maximizing overlapping area for capacitance without increasing the overall footprint that blocks light.
2Reliability
If the overlapping area between common electrode and pixel electrode is increased, then the storage capacitance is improved, but the light transmission area is reduced
Solution Approach 1:
The patent resolves this contradiction by moving the capacitance-enhancing overlap into the depth dimension through the recess structure. The electrodes overlap in the vertical direction while maintaining separate lateral boundaries, allowing capacitance improvement without sacrificing horizontal light transmission area.
Solution Approach 2:
The recess structure creates a localized region of high capacitance density where the electrodes are in close proximity, while the surrounding areas maintain full light transmission. This concentrates the capacitance-enhancing function in a specific three-dimensional region without affecting the overall optical properties of the display panel.
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 design increases the storage capacitance between the electrodes, improving liquid crystal deflection control while maintaining light transmission, thereby addressing the degradation issue.
Implementation Method 1
a storage capacitance and a fringe field capacitance are formed between the pixel electrode and the common electrode
Implementation Method 2
The fringe field capacitance may provide a voltage for controlling deflection of liquid crystal molecules
Data Source
AI summary
The disclosure relates to an array substrate, a display panel, a display device, and methods of manufacturing them. The array substrate includes: a base substrate, a first electrode, a first insulating layer, and a second electrode, the second electrode having a plurality of second electrode portions spaced apart from one another, the first electrode having overlapped portions that overlap the plurality of second electrode portions, the first electrode is one of a common electrode and a pixel electrode and the second electrode is the other; at least one of the second electrode and the overlapped portions has a recess recessing towards the base substrate and an area of an opening of the recess is larger than an area of a bottom of the recess.