OLED Display Power Wiring Layout for Horizontal Stripe Reduction
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Solution Overview
Problem
Fluctuations in power supply voltage cause horizontal stripes in the display of light emitting devices, particularly those using organic light emitting elements, due to parasitic capacitances affecting the gate-source voltage of driving transistors.
Innovation Solution
Arranging a part of the power supply wiring at the same height as or closer to the second electrode than the first electrode, with capacitive coupling to the cathode electrode, to stabilize the power supply voltage and reduce fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply wiring is arranged in a conventional position, then the device structure is simple, but fluctuations in power supply voltage cause horizontal stripes in the display
Solution Approach 1:
The power supply wiring acts as an intermediary element that is strategically positioned between the first electrode (anode) and second electrode (cathode) to mediate voltage fluctuations. By placing the wiring at a specific height closer to the second electrode, it forms a capacitive coupling that stabilizes the gate-source voltage of the driving transistor, thereby preventing horizontal stripes in the display without requiring additional shielding or filtering components.
Solution Approach 2:
The invention changes the spatial parameter (height position) of the power supply wiring from a conventional position to a specific position closer to the second electrode. This parameter change optimizes the capacitive coupling effect between the power supply wiring and the electrodes, transforming the wiring's electromagnetic field distribution to stabilize voltage and eliminate display artifacts caused by power fluctuations.
2Stability of the object's composition
If the power supply wiring is positioned closer to the second electrode, then voltage fluctuations are suppressed, but the wiring arrangement becomes more complex
Solution Approach 1:
The power supply wiring simultaneously performs multiple functions: it supplies power to the driving transistor and acts as a capacitive element to stabilize voltage fluctuations. By positioning the wiring closer to the second electrode, it serves dual purposes of electrical connection and voltage stabilization, eliminating the need for separate decoupling capacitors or shielding structures.
Solution Approach 2:
The power supply wiring stabilizes its own voltage fluctuations by utilizing its inherent capacitance when positioned closer to the second electrode. The wiring's own electromagnetic field interacts with the electrodes to create a self-regulating effect that suppresses voltage variations, allowing the system to compensate for power fluctuations without external intervention or additional components.
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
Stabilizes the gate-source voltage of driving transistors, minimizing horizontal stripes and ensuring consistent luminance across the display.
Implementation Method 1
at least a part of the power supply wiring is arranged at one of the same height as a bottom surface of the first electrode and a position closer to the second electrode than the height
Data Source
AI summary
Alight emitting device comprises a plurality of pixels each including a light emitting element and a driving transistor configured to drive the light emitting element; and a power supply wiring configured to supply a power supply voltage to the driving transistor. The light emitting element includes a first electrode, a light emitting layer arranged on the first electrode, and a second electrode arranged on the light emitting layer. At least a part of the power supply wiring is arranged at one of the same height as a bottom surface of the first electrode and a position closer to the second electrode than the height.