LCD Array Substrate Comb Electrode Flow Control
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Solution Overview
Problem
The rotation uniformity of liquid crystals in LCD panels is affected by the line width of pixel electrodes, leading to reduced brightness and the generation of mura (unbalanced brightness) due to directional developer flow during the manufacturing process, resulting in unstable electrical fields.
Innovation Solution
The development of an array substrate with a transparent conducting layer and specific comb patterns or wall remainders that control developer flow to equalize line widths of pixel electrodes, ensuring uniform electrical fields and preventing mura.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the probe metal region with bigger area is formed around the periphery of LCD panel for inputting detection signals, then the electrical field is increased and the rotation uniformity is better, but the recesses between the photoresist regions with bigger area speed up the flow velocity of the developer to the pixel electrode within the LCD panel so that the exposure pattern of pixel electrode is over-developed or under-developed
Solution Approach 1:
The patent introduces a bridge structure as an intermediary element between the pixel electrode and the probe metal region. This bridge structure mediates the developer flow, preventing the accelerated flow caused by large probe metal regions while maintaining the electrical field strength needed for liquid crystal rotation uniformity. The bridge acts as a flow regulator that balances the competing requirements of electrical performance and manufacturing precision.
Solution Approach 2:
The patent segments the probe metal region into multiple smaller regions connected by bridge structures. Instead of forming one large continuous probe metal region, the structure is divided and connected through bridges, which controls the developer flow velocity while maintaining the overall electrical field strength. This segmentation approach resolves the contradiction between needing large area for electrical field and controlling developer flow for precise line width.
2Manufacturing precision
If the exposure pattern of pixel electrode is over-developed, then the line width of the pixel electrode is considerably shrunk, but the rotation uniformity of liquid crystal in the LCD panel is downgraded and affects the display quality of the LCD panel
Solution Approach 1:
The bridge structure serves as an intermediary that regulates developer flow to achieve balanced development. By controlling the flow velocity through the bridge, the system achieves proper development of the pixel electrode line width without over-development, thereby maintaining both manufacturing precision and the electrical field strength required for liquid crystal rotation uniformity.
3Reliability
If the electrical field is increased to improve rotation uniformity, then the magnitude of the electrical field is proportional to the line width of the pixel electrode, but the recesses between the photoresist regions speed up the flow velocity of the developer resulting in unstable electrical field
Solution Approach 1:
The bridge structure acts as an intermediary element that stabilizes the system by controlling developer flow. It prevents the accelerated flow that would lead to unstable electrical fields, while still allowing the probe metal region to maintain sufficient area for generating strong electrical fields needed for liquid crystal rotation uniformity.
Solution Approach 2:
The bridge structure is formed in advance during the manufacturing process to pre-establish the flow control mechanism. This preliminary action ensures that when the probe metal region is formed, the developer flow is already regulated, preventing instability in the electrical field while maintaining the required field strength for rotation uniformity.
Data Source
AI summary
An array substrate, liquid crystal display for the same and manufacturing method thereof are described. The array substrate includes a substrate, a plurality of scan lines, a plurality of data lines, a plurality of contact pads, a passivation layer and transparent conducting layer. The substrate has a first display region, a second display region and a first non-display region. The contact pads are disposed in the first non-display region. The transparent conducting layer disposed in the passivation layer includes a first pixel electrode, a second pixel electrode and a plurality of comb electrode. The first pixel electrode and second pixel electrode are disposed in the first display region and the second display region wherein the widths of the first pixel electrodes either are equal to or approximate the widths of the second pixel electrodes. The comb electrodes are disposed in the first non-display region and connected to the contact pads.