Transparent TFPC Binding Area on Color Filter Substrate
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Solution Overview
Problem
In on-cell touch control technologies, the binding of touch flexible printed circuits (TFPC) onto a color filter substrate is challenging to monitor due to the obstruction by the black matrix, leading to uncertain quality and high risk of errors in the TFPC binding process, resulting in low yield and high loss.
Innovation Solution
A color filter substrate with a transparent TFPC binding area and a separate black matrix light shielding area allows for the monitoring of binding conditions, using a transparent base substrate and avoiding overlapping areas to ensure clear visibility of the binding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the black matrix area overlaps with the TFPC binding area, then light shielding is improved, but monitoring of binding conditions becomes impossible
Solution Approach 1:
The color filter substrate is divided into distinct functional areas: a black matrix area for light shielding and a separate transparent TFPC binding area for monitoring. This segmentation allows each area to perform its specific function without interfering with the other, resolving the contradiction between light shielding and monitoring capability.
Solution Approach 2:
The monitoring function is extracted by creating a dedicated transparent binding area separate from the black matrix area. This extracted transparent region allows light to pass through, enabling optical monitoring of the TFPC binding process while the black matrix maintains its light shielding function in its own area.
2Ease of manufacture
If the TFPC binding area is opaque, then manufacturing is simplified, but quality monitoring becomes difficult
Solution Approach 1:
The color filter substrate exhibits local quality variation: the TFPC binding area is transparent to allow monitoring, while the black matrix area is opaque for light shielding. This localized differentiation in optical properties enables both manufacturing simplicity and quality monitoring to coexist by assigning different properties to different regions.
3Device complexity
If the black matrix and TFPC binding area overlap, then device complexity is reduced, but yield decreases due to undetected binding errors
Solution Approach 1:
The substrate area is segmented into non-overlapping black matrix and TFPC binding regions. This spatial segmentation prevents the black matrix from obscuring the binding area, enabling real-time monitoring of binding quality and reducing defects, thereby improving yield despite the slightly increased structural complexity.
Data Source
AI summary
A color filter substrate (2), a liquid crystal module and a display device are disclosed. The color filter substrate includes a touch flexible printed circuit binding area (3) for binding a touch flexible printed circuit; and a black matrix area (4) light shielding; the touch flexible printed circuit binding area (3) and the black matrix area (4) are two areas separate from each other and have no overlapping or partially overlapping parts therebetween; and a bottom of the touch flexible printed circuit binding area (3) is transparent. The color filter substrate (2), the liquid crystal module and the display device enable the binding conditions and the state of conducting particles to be monitored from backside, so that product yield is improved and accident rate is reduced.