Display Device Driving Circuit Overlap Layout
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Solution Overview
Problem
The challenge is to reduce the size of the peripheral area in display devices while maintaining high resolution and driving capabilities, which is difficult due to the increased area occupied by drivers for high-resolution and high-rate driving.
Innovation Solution
The display device incorporates a substrate with a first and second display area, a driving circuit overlapping the second light-emitting device, and a pattern portion with an extension electrode connecting the common voltage supplying line to the common electrode, along with an encapsulation layer and dam structures to prevent wire connection defects and extend the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the driver area is increased to support high resolution and high-rate driving, then the driving capability is improved, but the display area is reduced
Solution Approach 1:
The patent positions the driving circuit in the peripheral area rather than within the display area, utilizing the vertical dimension (z-axis) by stacking the driving circuit layer above the display structure. This allows the driving circuit to be integrated without occupying the horizontal display area, effectively resolving the contradiction between driving capability and display area.
Solution Approach 2:
The driving circuit is nested within the peripheral area structure, with the driving circuit layer integrated into the existing display device layers. The driving circuit is positioned in the peripheral area and connected to the display area through conductive structures, allowing compact integration without compromising display area.
2Area of stationary object
If the driving circuit is positioned in the peripheral area, then the display area is extended, but wire connection defects may occur
Solution Approach 1:
The patent introduces an extension electrode as an intermediary structure that bridges the driving circuit in the peripheral area and the common electrode in the display area. This extension electrode ensures reliable electrical connection while allowing the driving circuit to be positioned in the peripheral area, thus extending the display area without compromising connection reliability.
Solution Approach 2:
The encapsulation layer is formed to cover and protect the pattern portion and connection structures before final assembly. This preliminary protective action prevents connection defects by shielding the electrical connections from environmental factors and mechanical stress during subsequent manufacturing and operation.
Data Source
AI summary
A display device includes a substrate including a first display area; a peripheral area; and a second display area disposed between the first display area and the peripheral area; a first light-emitting device disposed on the first display area of the substrate; a second light-emitting device disposed on the second display area of the substrate; a driving circuit disposed on the second display area and the peripheral area of the substrate and overlapping the second light-emitting device in a plan view; a pattern portion disposed on the driving circuit; and a dam disposed on an outside of the pattern portion.