OLED Common Electrode Width Optimization for Miniaturization
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Solution Overview
Problem
In OLED display devices, miniaturization is hindered by the need to reduce wiring resistance in common electrodes, which can lead to display unevenness due to local current concentration, and widening wiring widths consumes semiconductor substrate area.
Innovation Solution
A display device design featuring a data line drive circuit with an opening defining layer between the conductive layer and common electrode, where the opening portion overlaps with the data line drive circuit and has a wider width on one side, allowing for reduced contact resistance without increasing substrate area, thus enabling miniaturization while maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wiring width of the common electrode is widened to reduce resistance value per unit length, then the resistance is reduced, but the area of the semiconductor substrate is consumed and miniaturization is inhibited
Solution Approach 1:
The opening defining layer creates a non-uniform structure where the opening portion has a greater width in the first direction than in the second direction. This local variation in geometry allows the common electrode to achieve lower resistance in critical areas without requiring a uniform increase in overall wiring width, thus reducing substrate area consumption while maintaining electrical performance
Solution Approach 2:
The opening portion of the opening defining layer is designed with asymmetric dimensions, having a greater width in the first direction compared to the second direction. This asymmetric configuration optimizes the conduction path for current flow, reducing resistance where needed while conserving substrate area in other regions, thereby resolving the contradiction between low resistance and miniaturization
2Reliability
If the wiring width is increased to reduce contact resistance, then contact resistance is reduced, but display unevenness occurs due to local concentration of current
Solution Approach 1:
The opening defining layer introduces localized geometric variation with the opening portion having different widths in different directions. This creates controlled local conduction paths that reduce contact resistance at critical interfaces without causing excessive current concentration, thereby maintaining display uniformity while improving electrical contact
Solution Approach 2:
The opening portion is designed with different width measurements in the first direction versus the second direction, utilizing dimensional variation to optimize current distribution. This multi-dimensional approach allows reduction of contact resistance through strategic geometry rather than simple width increase, preventing display unevenness
Data Source
AI summary
A display device includes a substrate having a first side and a second side, a display region having a light-emitting element that includes an electrode, a pixel electrode disposed between the substrate and the electrode in a thickness direction of the substrate, and a light-emitting function layer disposed between the pixel electrode and the electrode in the thickness direction, a drive circuit disposed between the first side and the display region in plan view, and a conductive layer having a first portion extending between the first side and the display region in plan view and along the first direction, and a second portion extending between the second side and the display region in plan view and along the second direction, wherein a width of the first portion in the second direction is greater than a width of the second portion in the first direction.