OLED Cathode Pad Layout for Stable Current in Contact Areas
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Solution Overview
Problem
Existing display devices, particularly those used in head-mounted displays, experience current reduction in the cathode contact area, which affects image quality.
Innovation Solution
The display device includes a substrate with a first electrode, a pixel defining layer, a light emitting stack, and a second electrode, where a cathode pad is continuously arranged in the contact area without disconnection, ensuring stable current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cathode pad is discontinuously arranged in the contact area, then the manufacturing process is simpler, but current reduction occurs affecting image quality
Solution Approach 1:
The cathode pad is configured to be continuously arranged in the contact area without disconnection, ensuring continuous electrical connectivity and stable current flow from the second electrode to the substrate, thereby preventing current reduction and maintaining image quality
2Reliability
If the cathode pad is continuously arranged in the contact area, then current flow is stable, but the device structure becomes more complex
Solution Approach 1:
The cathode pad maintains continuous arrangement in the contact area, ensuring uninterrupted current flow path and stable electrical connectivity, which directly addresses the reliability requirement while the complexity is managed through the straightforward continuous structure
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
This configuration minimizes current reduction, enhancing image quality by maintaining consistent electrical connectivity and improving display performance.
Implementation Method 1
an organic light emitting diode (OLED), which is a high-resolution small organic light emitting display device, is used as the display device applied to the head mounted display
Data Source
AI summary
A display device, an optical device including the display device, and an electronic device including the display device are disclosed. The display device, the optical device, and the electronic device may minimize or reduce current reduction (or minimize or reduce a degree or occurrence of current reduction) in a cathode contact area. The display device may include: a substrate; a first electrode on the substrate; a pixel defining layer on the first electrode; a light emitting stack on the first electrode and the pixel defining layer; a second electrode on the light emitting stack; and a cathode pad connected to the second electrode through a contact area defined by the pixel defining layer in a cathode contact area of the substrate, wherein the cathode pad may be continuous in the contact area without disconnection.