Display Device Driving Circuit Layout Narrow Bezel
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Solution Overview
Problem
Existing touch display devices face challenges in achieving a narrow bezel design due to the increased frame area required for driving circuits, especially when integrating sensors like fingerprint sensors, which leads to wasted space and difficulty in reducing the overall thickness and manufacturing cost.
Innovation Solution
The solution involves an active display array and an optical sensor array with a unique arrangement of driving circuits, where the third driving circuit is positioned between the first and second driving circuits, all sharing the same horizontal frame space, and using different metal layers to prevent signal interference and optimize layout, allowing for a compact design without increasing the horizontal frame width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple driving circuits are arranged in parallel to drive sensors and display arrays, then the driving functionality is improved, but the frame area increases and bezel width cannot be reduced
Solution Approach 1:
The patent transitions from a two-dimensional parallel arrangement of driving circuits to a three-dimensional stacked configuration using multiple metal layers. The first and second driving circuits are arranged in parallel on the same layer, while the third driving circuit is positioned on a different metal layer between them, utilizing the vertical dimension to reduce horizontal frame area occupation.
Solution Approach 2:
The third driving circuit is nested within the spatial region occupied by the first and second driving circuits by placing it on an intermediate metal layer. This nested arrangement allows multiple driving circuits to coexist in the same horizontal footprint, effectively reducing the overall frame area required for housing all driving circuits.
2Area of stationary object
If driving circuits are integrated to reduce frame area, then the bezel width is reduced, but signal interference may occur between circuits
Solution Approach 1:
By distributing driving circuits across multiple metal layers (first metal layer for first and second driving circuits, second metal layer for third driving circuit), the patent spatially separates circuits that would otherwise be in close horizontal proximity. This vertical separation reduces electromagnetic signal interference while maintaining compact horizontal footprint.
Solution Approach 2:
The patent introduces different metal layers as intermediary structures between driving circuits. These intermediate layers act as physical barriers and electrical isolation zones, reducing direct signal coupling and interference between adjacent driving circuits while allowing them to function in close proximity.
Data Source
AI summary
A display device includes an active display array, an optical sensor array, a first driving circuit, a second driving circuit, and a third driving circuit. The active display array includes a number of scan lines. The first driving circuit is coupled to a first portion of the scan lines through a first metal layer. The second driving circuit is coupled to a second portion of the scan lines through the first metal layer. The third driving circuit is disposed between the first driving circuit and the second driving circuit and is coupled to the optical sensor through a second metal layer. The second metal layer is different from the first metal layer.