OLED Display Wiring Layout With Shielding Extension for Crosstalk
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Solution Overview
Problem
As the number of pixels increases in a unit area for high-resolution displays, the coupling between conductive layers in organic light emitting display devices increases, leading to decreased scan on time (SOT), increased power consumption, and crosstalk.
Innovation Solution
Incorporating an extension portion in the conductive layers to shield between stacked conductive layers, reducing coupling by transmitting a constant voltage and maintaining sufficient scan on time (SOT) while decreasing power consumption and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels in a unit area increases to implement high-resolution display, then the resolution is improved, but the coupling between conductive layers increases
Solution Approach 1:
A shielding line is introduced as an intermediary conductive element between stacked conductive layers to block electromagnetic coupling. The shielding line transmits a constant voltage (e.g., ELVDD or ELVSS) and physically separates signal-carrying conductors, preventing harmful capacitive coupling while allowing the high-resolution pixel layout to be maintained.
Solution Approach 2:
The harmful coupling effect is extracted and addressed by removing the direct capacitive interaction between conductive layers through the shielding line. By placing the shielding line between coupled conductors, the harmful electromagnetic field is blocked, effectively taking out the coupling problem from the system.
2Productivity
If the coupling between conductive layers increases, then the scan on time (SOT) decreases
Solution Approach 1:
The shielding line acts as a mediator that blocks the capacitive coupling between conductive layers, preventing the charge leakage that would otherwise reduce scan on time. By inserting this constant voltage conductor between signal lines, the SOT is maintained at sufficient levels despite the high pixel density.
3Use of energy by stationary object
If the coupling between conductive layers increases, then the power consumption increases
Solution Approach 1:
The shielding line blocks the capacitive coupling that causes charge leakage and unnecessary current flow. By preventing this coupling, the power consumption is reduced as less energy is wasted in charging and discharging parasitic capacitances between conductive layers.
4Loss of information
If the coupling between conductive layers increases, then the crosstalk increases
Solution Approach 1:
The shielding line serves as an electromagnetic barrier that prevents signal interference between adjacent conductors. By blocking the capacitive coupling, it prevents crosstalk where signals from one conductor would couple into neighboring conductors, thus preserving signal integrity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively decreases coupling between conductive layers, ensuring sufficient scan on time, reducing power consumption, and minimizing crosstalk in the display device.
Implementation Method 1
the first driving voltage line may include an extension portion which extends in the second direction and disposed between the first connection line and the connection electrode to overlap at least one of the first connection line and the connection electrode
Data Source
AI summary
A display device may include an active layer disposed on a substrate, a first conductive layer disposed on the active layer and including a gate electrode, a second conductive layer disposed on the first conductive layer, a third conductive layer disposed on the second conductive layer and including a connection electrode connecting the active layer and the gate electrode, a fourth conductive layer disposed on the third conductive layer and including a first driving voltage line extending in a first direction, and a fifth conductive layer disposed on the fourth conductive layer and including a first connection line extending in a second direction intersecting the first direction. The first driving voltage line may include an extension portion which extends in the second direction and disposed between the second connection line and the connection electrode to overlap at least one of the second connection line and the connection electrode.