Embedded Touch Panel Shielding Electrode Connection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The integration of a touch panel with a liquid crystal display device leads to noise infiltration and signal interference, requiring a Flexible Printed Circuit (FPC) to apply a shielding signal, which increases manufacturing costs and complicates the fabrication process.
Innovation Solution
A display device with an embedded touch panel that eliminates the need for an FPC by forming shielding electrode connection portions on the sensor substrate, allowing the shielding signal to be supplied directly from the upper side, reducing the number of FPCs required and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an FPC is mounted to the underside of the shielding electrode to apply a shielding signal, then the shielding function is achieved, but the number of FPCs increases, increasing cost and complicating the fabrication process
Solution Approach 1:
The patent merges the shielding signal supply function into the sensor substrate by forming shielding electrode connection portions directly on the sensor substrate. This integrates the shielding functionality with the existing touch panel structure, eliminating the need for separate FPCs mounted on the underside of the shielding electrode, thus reducing component count and simplifying fabrication while maintaining effective shielding
Solution Approach 2:
The patent transitions from a vertical connection approach (using FPCs mounted on the underside of the shielding electrode) to a planar connection approach (forming connection portions directly on the sensor substrate surface). This dimensional change allows the shielding signal to be supplied through the same side as the sensor FPC, reducing the need for additional components and simplifying the overall structure
2Reliability
If an FPC is mounted to the underside of the shielding electrode, then the shielding signal can be applied, but the manufacturing cost increases
Solution Approach 1:
The patent combines the shielding signal supply function with the existing sensor substrate structure by forming shielding electrode connection portions directly on the sensor substrate. This eliminates the need for separate FPCs, reducing component count, material costs, and assembly complexity, thereby lowering manufacturing cost while maintaining effective shielding functionality
3Adaptability or versatility
If a touch panel is mounted to the liquid crystal panel, then the display device gains touch sensing capability, but noise infiltrates into the liquid crystal panel and signal interference occurs
Solution Approach 1:
The patent introduces a shielding electrode as an intermediary element between the touch panel and the liquid crystal panel. This shielding electrode, connected to the sensor substrate, acts as a mediator that blocks electromagnetic noise and prevents signal interference from the touch panel from affecting the liquid crystal panel, thereby enabling touch sensing functionality without the harmful side effects
Data Source
AI summary
The present invention relates to a display device with an embedded touch panel which eliminates FPC mounted to a shielding electrode for applying a shielding signal to the shielding electrode, to reduce a cost and simplify a fabrication process.The touch panel embedded display device includes a liquid crystal panel having an upper substrate and a lower substrate faced to each other with liquid crystals disposed therebetween, and a touch panel mounted on the liquid crystal panel, wherein the touch panel includes a sensor substrate having first and second pattern portions which function as position sensing electrodes and a shielding signal supply line formed on an upper side thereof for supplying a shielding signal, a shielding electrode formed on an underside of the sensor substrate, and two or more shielding electrode connection portions for connecting the shielding electrode to the shielding signal supply line.