Display Signal Line Bypass Layout for Light-Transmitting Areas
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Solution Overview
Problem
Display devices face challenges in securing a sufficient light-transmitting area while reducing parasitic capacitance and coupling between signal lines, which affects image display quality and efficiency.
Innovation Solution
The design incorporates a display device with a light-transmitting portion, a data line split into portions spaced apart by the light-transmitting area, and a conductive pattern that includes bypass portions to reduce signal line coupling, ensuring a sufficient light-transmitting area and minimizing parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If data lines are continuously extended through the second display area to maintain electrical connection, then signal transmission is ensured, but the light-transmitting area is reduced and parasitic capacitance increases
Solution Approach 1:
The data line is divided into two separate portions: a first data line extending from the peripheral area to a first end in the first display area, and a second data line extending from a second end in the first display area to the second display area. This segmentation allows the light-transmitting portion to be positioned between the two data line portions without requiring a continuous data line through the second display area, thus maintaining both signal transmission and light-transmitting area.
Solution Approach 2:
A conductive pattern is introduced as an intermediary element to bridge the electrical connection between the first and second data line portions. The conductive pattern includes a first pattern portion electrically connected to both data line portions and a second pattern portion spaced apart from the first, with at least one receiving a constant voltage to function as a shielding pattern. This intermediary structure enables electrical connection while reducing parasitic capacitance and maintaining light-transmitting properties.
2Area of stationary object
If data lines are positioned close to each other to save space, then device area is reduced, but coupling between signal lines increases causing unwanted signal changes
Solution Approach 1:
The shielding pattern acts as an intermediary between the first and second data lines, receiving a constant voltage to create an equipotential region that reduces electromagnetic coupling between the signal lines. This allows the data lines to be positioned closer together while minimizing unwanted signal changes through the shielding effect of the conductive pattern.
Solution Approach 2:
The conductive pattern receives a constant voltage to establish an equipotential region between the data lines, reducing the electric field gradient and thereby minimizing capacitive coupling and crosstalk between adjacent signal lines while allowing compact positioning.
3Reliability
If conductive patterns are added to reduce parasitic capacitance and coupling, then signal quality is improved, but device complexity increases
Solution Approach 1:
The conductive pattern serves multiple functions simultaneously: it provides electrical connection between the first and second data line portions through the first pattern portion, reduces parasitic capacitance through the second pattern portion spaced apart from the first, and minimizes signal line coupling through the shielding effect when receiving constant voltage. This multi-functionality reduces the need for separate dedicated structures for each function.
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.