Capacitive Touch LCD With Isolated Electrode Slits
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Solution Overview
Problem
The existing liquid crystal display devices with capacitance-type touch panels have increased thickness and production costs due to separate manufacturing of touch sensor and liquid crystal display bodies, and suffer from malfunctions and high defective rates.
Innovation Solution
The integration of a capacitance-type touch panel is achieved by using a CF substrate with belt-like transparent lines and a TFT substrate with isolated transparent electrode common lines, including a redundant slit structure to ensure proper isolation and reduce defective rates, thereby reducing the thickness and cost of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the touch sensor body and liquid crystal display body are separately manufactured and assembled, then the device can be produced with conventional manufacturing processes, but the thickness and production cost of the device increase
Solution Approach 1:
The patent merges the touch sensor body and liquid crystal display body into a single integrated structure. The touch sensor electrodes are formed on the same substrate as the liquid crystal display electrodes, eliminating the need for separate manufacturing and assembly. This integration directly reduces device thickness while maintaining compatibility with conventional manufacturing processes through a unified fabrication approach.
Solution Approach 2:
The patent implements multi-functionality by using the same transparent electrode layers and conductive structures to serve both as liquid crystal display electrodes and as touch sensor electrodes. The common electrode and signal electrodes perform dual functions, eliminating redundant components and reducing overall device thickness while maintaining ease of manufacture through standardized processes.
2Ease of manufacture
If the touch sensor body and liquid crystal display body are separately manufactured and assembled, then conventional manufacturing processes can be used, but the production cost increases
Solution Approach 1:
By combining the touch sensor and liquid crystal display into a single integrated structure with shared electrodes and substrates, the patent eliminates the need for separate manufacturing lines and assembly processes. This merger reduces production complexity and cost while maintaining compatibility with existing conventional manufacturing processes.
Solution Approach 2:
The patent uses universal electrode structures that serve multiple functions (display and touch sensing), reducing the number of distinct components and manufacturing steps required. This multi-functionality approach simplifies production and reduces costs by eliminating redundant manufacturing processes.
3Ease of manufacture
If the transparent electrode common line is fully formed without isolation slits, then the manufacturing process is simpler, but malfunction occurs in the touch panel
Solution Approach 1:
The patent segments the transparent electrode common line by introducing isolation slits that divide it into multiple isolated electrode regions. This segmentation prevents electrical shorting between adjacent electrodes while maintaining proper touch panel functionality, resolving the malfunction issue without significantly complicating the manufacturing process.
Solution Approach 2:
The patent applies local quality by introducing isolation slits only in specific regions where electrode separation is needed, while maintaining continuous electrode structures in other regions. This localized modification ensures proper touch panel operation without unnecessarily complicating the overall electrode formation process.
4Reliability
If isolation slits are introduced to the transparent electrode common line, then touch panel malfunction is prevented, but the manufacturing complexity increases
Solution Approach 1:
The patent uses segmentation to introduce isolation slits that prevent electrode shorting and touch panel malfunction. While this increases structural complexity, the segmentation is implemented in a systematic and regular pattern that maintains manufacturing feasibility and does not excessively increase overall device complexity.
Data Source
AI summary
To provide a thin liquid crystal display device equipped with the capacitance-type touch panel, and specifically the thin liquid crystal display device with a lower cost and a higher reliability.The thin liquid crystal display device includes a CF substrate and a TFT substrate formed with a transparent electrode common line, the CF substrate having a plurality of transparent lines, the transparent electrode common line being isolated into a plurality of belt-like forms by an isolation slit, and an area where the transparent line and the transparent electrode common line constitutes an upper electrode and a lower electrode of the capacitance-type touch panel. Furthermore, there are provided a redundant slit and a disconnectable point of the metal common line.