Display Device Conductive Pattern Shielding Parasitic Capacitance
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Solution Overview
Problem
Existing display devices face challenges in securing a sufficient area for light transmission while minimizing parasitic capacitance and coupling between signal lines.
Innovation Solution
The display device incorporates a design with a light-transmitting portion and a conductive pattern that includes bypass portions to reduce parasitic capacitance and coupling, ensuring a sufficient light-transmitting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data lines are arranged closely to increase pixel density, then productivity is improved, but parasitic capacitance and coupling between signal lines increase
Solution Approach 1:
A conductive pattern is introduced as an intermediary element between data lines to shield them from each other. The conductive pattern is electrically connected to a reference potential (such as ground or a power supply voltage) to form a shield that reduces parasitic capacitance and coupling between adjacent data lines, enabling closer line spacing without increasing interference.
Solution Approach 2:
The solution moves from a two-dimensional planar arrangement of data lines to a three-dimensional structure by adding conductive patterns at different conductive layers. This vertical dimensionality allows data lines to be closely spaced in the plane while maintaining electrical isolation through the conductive patterns positioned above or below them.
2Illumination intensity
If light-transmitting portion area is increased, then illumination intensity is improved, but device complexity increases due to additional conductive patterns
Solution Approach 1:
The conductive pattern serves multiple functions simultaneously: it acts as an electromagnetic shield to reduce parasitic capacitance and coupling between data lines, and it functions as a light-transmitting structure that does not significantly block optical paths. By making the conductive pattern transparent or semi-transparent, the design achieves both electrical isolation and optical performance without requiring separate shielding structures.
3Object-generated harmful factors
If data lines are spaced apart to reduce coupling, then parasitic capacitance is reduced, but area of stationary object increases
Solution Approach 1:
The conductive pattern acts as a shielding intermediary that enables data lines to be positioned closer together while maintaining low coupling. The shield formed by the conductive pattern, connected to reference potential, electrically isolates adjacent data lines, allowing reduced spacing without increasing parasitic capacitance or coupling effects.
Data Source
AI summary
A display device includes a display area which includes a first display area including a plurality of first pixels and a second display area including at least one second pixel and at least one light-transmitting portion, a peripheral area disposed around the display area, a data line including a first portion and a second portion spaced apart from each other in a predetermined direction with the light-transmitting portion therebetween, and a conductive pattern disposed at a different conductive layer from the data line. The conductive pattern includes a first pattern portion including a bypass portion that bypasses a periphery of the second display area in a plan view and disposed in the first display area, and the first pattern portion includes a first end electrically connected to the first portion of the data line and a second end electrically connected to the second portion of the data line.