Array Substrate Common Electrode Overlap Aperture Ratio
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Solution Overview
Problem
The increasing demand for higher resolution in liquid crystal display panels, driven by advancements in display technology, leads to higher IC costs and reduced yield rates due to double gate line designs, which compromise the aperture ratio of liquid crystal display panels.
Innovation Solution
An array substrate design featuring a base substrate with pixel electrode pairs, a data line between them, and common lines that overlap with adjacent pixel electrodes, forming storage capacitors and improving aperture ratio without additional processes, while enhancing storage capacitor stability and display image stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If double gate line design is adopted to reduce IC cost, then IC cost is reduced, but aperture ratio is reduced
Solution Approach 1:
The patent merges the function of the common electrode with an existing electrode layer (either gate electrode or pixel electrode) to form a composite electrode structure. This integration eliminates the need for a separate common electrode layer and its associated insulation layers, thereby reducing manufacturing complexity and IC cost while maintaining sufficient aperture ratio by avoiding additional structural elements that would occupy pixel area.
Solution Approach 2:
The patent makes an existing electrode layer serve multiple functions: it acts as both the common electrode and either the gate electrode or pixel electrode simultaneously. This multi-functional design reduces the total number of electrode layers required, simplifies the structure, and prevents the aperture ratio from being reduced by additional common electrode structures while still achieving the cost reduction goal.
2Reliability
If common electrode is added to improve storage capacitor stability, then storage capacitor stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the common electrode function with an existing gate electrode or pixel electrode, forming a composite electrode that performs both functions simultaneously. This merging approach ensures sufficient storage capacitor stability through the overlapping region between the composite electrode and the other electrode type, while avoiding the manufacturing complexity of adding a separate common electrode layer and its associated insulation structures.
Solution Approach 2:
The patent enables an existing electrode layer to serve dual purposes: as the common electrode for storage capacitor formation and as either the gate electrode or pixel electrode for display operation. This multi-functionality achieves reliable storage capacitor stability without increasing device complexity, as the same structural element fulfills multiple roles rather than requiring additional components.
Data Source
AI summary
An array substrate and a manufacturing method thereof, a display panel and a display device are provided. The array substrate includes: a base substrate; a first electrode layer including a plurality of pixel electrode pairs arranged in an array, each of the plurality of pixel electrode pairs (1110; 2100) including a first pixel electrode and a second pixel electrode adjacent to the first pixel electrode in a row direction; and a first common portion, an orthographic projection of the first common portion on the base substrate being at least partially overlapped with an orthographic projection of at least one of adjacent first pixel electrode or second pixel electrode of two adjacent pixel electrode pairs in the row direction on the base substrate.