In-Cell Touch LCD Common Electrode Integration
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Solution Overview
Problem
The manufacturing process of in-cell touch LCD devices is complex and costly due to the need for separate production of liquid crystal panels and touch screens, often resulting in defects during bonding and increased bezel width.
Innovation Solution
An in-cell touch LCD device design where a common electrode is disposed on a TFT array substrate and used as a touch electrode, with a touch electrode line connected to a touch driver, allowing for integrated touch functionality without the need for a separate touch screen, reducing manufacturing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a touch screen is disposed on a liquid crystal panel (add-on type), then touch functionality is achieved, but the manufacturing process becomes complicated and cost increases
Solution Approach 1:
The patent merges the touch screen and liquid crystal panel into a single integrated structure. The touch sensor is formed on the same substrate as the liquid crystal display, with the common electrode serving dual purposes as both the LCD common electrode and the touch sensor electrode. This eliminates the need for separate manufacturing and bonding processes, directly resolving the contradiction between achieving touch functionality and maintaining manufacturing simplicity
Solution Approach 2:
The common electrode is designed to serve multiple functions: it acts as the common electrode for the liquid crystal display and simultaneously serves as the touch sensor electrode. This multi-functionality reduces the number of separate components and manufacturing steps, addressing the contradiction by achieving touch functionality without adding manufacturing complexity
2Reliability
If a touch screen is disposed on a liquid crystal panel (add-on type), then touch functionality is achieved, but defects can be generated in bonding process
Solution Approach 1:
By merging the touch sensor and LCD into a single integrated device formed on the same substrate, the patent eliminates the bonding process entirely. The touch sensor electrodes and LCD electrodes are formed simultaneously in the same manufacturing sequence, preventing bonding defects and ensuring high manufacturing precision
3Reliability
If touch electrode lines are disposed in bezel areas, then touch functionality is achieved, but bezel width increases
Solution Approach 1:
The patent transitions the touch electrode line routing from the horizontal bezel dimension to the vertical dimension by extending lines along the data line direction. This allows touch functionality to be maintained while minimizing the horizontal bezel width, effectively resolving the contradiction between achieving touch functionality and maintaining compact dimensions
Data Source
AI summary
An in-cell touch liquid crystal display (LCD) device is discussed. The in-cell touch LCD device includes a pixel driver including a thin film transistor (TFT) disposed in each of a plurality of pixels, a passivation part protecting the pixel driver, a pixel electrode disposed on the passivation part and connected to a first electrode included in the TFT, and a touch electrode line disposed on the passivation part and insulated from the pixel electrode. The in-cell touch LCD further includes a cover part covering the pixel electrode and the touch electrode line, and a common electrode disposed on the cover part, connected to the touch electrode line via the cover part, and supplied with a common voltage or a touch driving signal from a touch driver connected to the touch electrode line.