Shielding Layer for AMOLED Gate Lead Parasitic Capacitance
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Solution Overview
Problem
The uneven distribution of transparent wires in active-matrix organic light emitting diode (AMOLED) display panels causes differences in parasitic capacitance between the wires and gate leads, leading to uneven display brightness (Mura) due to variations in parasitic capacitance.
Innovation Solution
A display device with a shielding layer between the gate lead and transparent conductive layer, along with a metal grid and DC power signal lines, is designed to mitigate parasitic capacitance differences by stabilizing the gate potential of the drive transistor, thereby ensuring uniform brightness across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent wires are used to electrically connect pixels in the camera area under the screen, then light transmittance of the camera area is improved, but parasitic capacitance difference between transparent wires and gate leads causes uneven display brightness
Solution Approach 1:
A shielding layer is introduced as an intermediary component between the transparent wires and gate leads. This shielding layer acts as a mediator that blocks the harmful electromagnetic interference and parasitic capacitance coupling, allowing the transparent wires to maintain high light transmittance while preventing display uniformity issues caused by parasitic capacitance differences
2Ease of operation
If transparent wires pass through gate leads of the drive transistor, then electrical connection to pixels is achieved, but parasitic capacitance is formed causing display brightness differences
Solution Approach 1:
The shielding layer serves as an intermediary that physically and electrically separates the transparent wires from the gate leads while still allowing the transparent wires to pass through the gate lead region. This maintains the necessary electrical connections for pixel operation while blocking the formation of harmful parasitic capacitance
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 shields parasitic capacitance, enhancing the stability of the drive transistor and preventing uneven brightness issues in the display device by maintaining a stable gate potential, thus improving the display's uniformity.
Implementation Method 1
a shielding layer located between the gate lead and the at least one transparent conductive layer, wherein the shielding layer is disposed corresponding to the gate lead
Data Source
AI summary
A display device and an electronic device are provided, and they shield the parasitic capacitance between the gate lead and the transparent wire by a shielding layer, so as to avoid the difference in parasitic capacitance from affecting a potential of the gate of the drive transistor to be varied and enhance the stability of the drive transistor as driving the light emitting device, so as to avoid the problem of uneven brightness when the light emitting device of the display device is displayed.