Touch Panel Controller IC Circuit Configuration for Uniformity
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Solution Overview
Problem
The existing circuit configurations for touch panel controller ICs face challenges in maintaining uniformity and sensing accuracy due to differences in environmental conditions and etch rates during fabrication, leading to variations in processing units and increased risk of short circuits during wire bonding in narrow bezel designs.
Innovation Solution
A circuit configuration where processing units are arranged in a parallel manner on a substrate with electrode pins along its border edges, and electric contacts are arranged in three rows around the units, minimizing environmental condition variations and reducing skew angles during wire bonding to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If processing units are arranged in different locations and directions to fit narrow bezel design, then installation space is reduced, but differences in environmental conditions during fabrication increase causing variation in processing units
Solution Approach 1:
The controller is divided into multiple processing units (first processing units B11 and second processing units B12) that are segmented into different functional groups. These segments are arranged in different orientations (transverse and longitudinal) to optimize space utilization while maintaining manufacturing consistency within each segment group.
Solution Approach 2:
Different regions of the controller are assigned different functional qualities - first processing units handle specific signal processing tasks while second processing units handle other tasks. This local differentiation allows each region to be optimized for its specific function while accommodating narrow bezel constraints.
2Adaptability or versatility
If processing units are arranged in different directions, then space utilization is improved, but lead wires have large skew angles causing short circuits during wire bonding
Solution Approach 1:
Electric contacts B3 are introduced as intermediary connection points between the processing units and the external electrode pins. These intermediaries are arranged in three rows around the processing units, providing optimized connection points that reduce the skew angles of lead wires during wire bonding, thereby preventing short circuits while maintaining space-efficient design.
3Productivity
If electrode pins are arranged closely to match processing unit density, then signal transmission channels are increased, but pitch between electrode pins is reduced increasing short circuit risk
Solution Approach 1:
The electric contacts are arranged in three rows around the processing units, transitioning from a single-line arrangement to a two-dimensional distributed arrangement. This dimensional change allows electrode pins to be positioned at optimized pitches that prevent short circuits while still providing sufficient signal transmission channels through the multi-row contact structure.
Data Source
AI summary
A circuit configuration for touch panel controller IC includes a substrate including electrode pins arranged along four border edges thereof for signal transmission, and a controller mounted on the substrate and surrounded by the electrode pins and including processing units arranged in one same direction in a parallel manner, electric contacts arranged in three rows at three sides around the processing units and respectively electrically connected to the electrode pins of the substrate by respective lead wires and steering wires respectively electrically connected between the processing units and the electric contacts. Arranging the processing units in one same direction in a parallel manner minimizes differences in environmental conditions in exposure graphic definition and etch rate, thereby obtaining better circuit component process uniformity, and thus, the variation among the processing units after fabrication can be insignificant and better sensing accuracy can be achieved.