Liquid Crystal Display Common Electrode Cutouts
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Solution Overview
Problem
The manufacturing of liquid crystal displays with two field generating electrodes on one substrate increases costs and can result in signal delays due to the need for multiple photomasks and potential delays in common electrode signal application.
Innovation Solution
A liquid crystal display design featuring a common electrode with cutouts matching the shape of an insulating layer, allowing for shared photomasks and a short point connection using short balls or metal paste to prevent signal delays, while maintaining efficient common voltage transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two field generating electrodes are formed on one display panel, then wide viewing angle is achieved, but manufacturing cost increases due to requiring different photomasks
Solution Approach 1:
The common electrode and the insulating layer are merged into a single formation process using a shared photomask. The photomask simultaneously defines the pattern for both the common electrode and the insulating layer, eliminating the need for separate photomasks and reducing manufacturing complexity while maintaining the wide viewing angle capability
Solution Approach 2:
The photomask serves multiple functions by being used to pattern both the common electrode and the insulating layer. This multi-functional use of the photomask reduces the total number of photomasks required, thereby lowering manufacturing costs while still achieving the desired wide viewing angle through the dual-electrode configuration
2Ease of manufacture
If common electrode is connected through existing structures, then manufacturing process is simplified, but signal delay occurs in common electrode voltage application
Solution Approach 1:
A dedicated common voltage transmission unit is pre-formed and extended from the common voltage line to reach the common electrode. This preliminary preparation of the voltage transmission path ensures that when the common electrode is connected, the voltage can be applied immediately without delay, while the overall manufacturing process remains simplified through the shared photomask approach
Data Source
AI summary
A liquid crystal display includes a first substrate, gate lines and data lines disposed on a display area of the first substrate, a common voltage line disposed on a peripheral area of the first substrate, a common voltage transmission unit extending from the common voltage line, an organic layer disposed on the common voltage transmission unit and the common voltage line, a connecting member disposed on the organic layer disposed on the peripheral area, a first insulating layer disposed on the pixel electrode and the connecting member, a common electrode disposed on the first insulating layer, and a short point connecting the connecting member and the common electrode to each other. The common electrode and the first insulating layer include a plurality of cutouts in the peripheral region and display region of the first substrate which have substantially a same plane shape as each other.