Single-Chip Panel Driver Pad Layout to Prevent Trace Crossings
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Solution Overview
Problem
The challenge of designing circuits and layouts for computing devices with integrated touch and display functionality, particularly in the presence of fingerprint sensing elements, is exacerbated by increased circuit complexity, leading to signal interference and uneven load distribution due to overlapping traces.
Innovation Solution
A single-chip device is implemented with specific pad arrangements that prevent traces for fingerprint, display, and touch sensors from crossing over each other, ensuring symmetrical trace lengths and reducing signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traces for fingerprint sensing, display, and touch sensors are routed without separation, then circuit area is reduced, but signal interference increases and load distribution becomes uneven
Solution Approach 1:
The single-chip device divides its pads into two distinct groups: a first group of pads for driving fingerprint sensing pixels and a second group of pads for driving display pixels and touch sensors. This segmentation allows separate trace routing for different functional groups, preventing signal interference while maintaining compact area through integrated single-chip architecture.
2Adaptability or versatility
If circuit complexity increases due to integration of touch sensing, fingerprint sensing, and display driving, then functionality is enhanced, but circuit layout and control design become more difficult
Solution Approach 1:
The device segments control circuits into distinct units: a first control circuit for fingerprint sensing pixels and a second control circuit for display pixels and touch sensors. This segmentation simplifies the design and control of each functional module while maintaining the enhanced versatility of integrated functionality.
Solution Approach 2:
The single-chip device integrates multiple functions (fingerprint sensing, display driving, touch sensing) into one chip, achieving universality. The first and second groups of pads share the same chip substrate and can be controlled by respective control circuits, enabling multi-functionality without proportionally increasing layout complexity.
3Ease of operation
If pads for different functions are distributed across both left and right portions, then connection flexibility is improved, but trace crossing and load imbalance occur
Solution Approach 1:
The pad groups are segmented and disposed on specific portions: the first group of pads for fingerprint sensing is disposed on at least one of the left or right portions, while the second group of pads for display and touch is disposed on at least another portion. This spatial segmentation prevents trace crossing between different functional groups while maintaining connection flexibility within each group.
Data Source
AI summary
A single-chip device for driving a panel including fingerprint sensing pixels, display pixels and touch sensors, electronic module therefor, and electronic apparatus are provided. The single-chip device comprises a main body, a first group of pads and a second group of pads disposed in the main body. The first group of pads comprise first pads for driving the fingerprint sensing pixels, and are disposed on at least one of a left portion and a right portion of the main body with respect to an axis. The second group of pads comprise second pads for driving the display pixels and the touch sensors, and are disposed on at least another one of the left portion and the right portion, wherein at least one group of the first group of pads and the second group of pads are disposed only on the one of the left portion and the right portion.