Display Power Pad Layout for Lower Current Density Heating
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Solution Overview
Problem
Heat generation and reliability issues in display devices due to concentrated electric current density at the power voltage pad region, leading to potential deterioration.
Innovation Solution
A display device structure is designed with varying widths of power lines and a metal pattern on the power voltage pad, along with a planarization layer featuring a trench to expose an electrode, connecting to power voltage pad electrodes, thereby distributing current density and reducing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power voltage is applied to the cathode electrode to operate the light-emitting element, then the light-emitting element can operate, but heat is concentrated in the region where the power voltage line and the cathode electrode are connected
Solution Approach 1:
The power voltage pad is divided into multiple sub-pads (first sub-pad, second sub-pad, third sub-pad, fourth sub-pad) arranged in a matrix pattern. This segmentation distributes the current density across multiple connection points rather than concentrating it at a single location, thereby reducing heat generation at any one point while maintaining the necessary power delivery to the cathode electrode.
Solution Approach 2:
The power voltage pad structure is extracted from the conventional single-pad design and reconfigured as a multi-pad matrix structure. By taking out the concentrated pad design and replacing it with distributed sub-pads, the patent eliminates the harmful heat concentration effect while preserving the power voltage delivery function.
2Temperature
If the area of the power voltage pad is increased to reduce current density, then heat generation is reduced, but the device complexity increases
Solution Approach 1:
Multiple power voltage sub-pads are merged into a unified matrix structure that functions as a single integrated power delivery system. The first, second, third, and fourth sub-pads are electrically connected through the power voltage lines to form a cohesive structure that distributes current while maintaining a compact footprint, avoiding the need for a single large pad that would increase device complexity.
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
Minimizes heat-related deterioration, enhancing the reliability and performance of the display device by optimizing current distribution and heat dissipation.
Implementation Method 1
When a power voltage is applied to the cathode electrode to operate the light-emitting element, heat may be concentrated in a region in which a power voltage line and the cathode electrode are connected
Data Source
AI summary
A display device may include a substrate including a display area comprising subpixels, and a non-display area; a pad part at one side of the non-display area and including data pad electrodes and power voltage pad electrodes; a first line part in the display area and including data lines and power lines; a second line part including, in the non-display area, first connection lines connecting the data pad electrodes and the data lines, and second connection lines connecting the power voltage pad electrodes and the power lines; a third electrode that traverses the second line part and in parallel with one side of the substrate; a planarization layer having a first trench that exposes the third electrode; a second electrode connected to the third electrode through the first trench; and fourth electrodes connecting the third electrode and the power voltage pad electrodes.