Display Device Common-Voltage Line Segmentation for Heat Reduction
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Solution Overview
Problem
Display devices, particularly light emitting diode displays, experience significant heating issues in the non-display area due to high current density, which can lead to reliability and durability concerns.
Innovation Solution
The implementation of specific voltage line configurations, including outer common voltage lines and grooves or openings, to distribute current more evenly and reduce heat generation in the non-display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the non-display area is minimized to reduce device size, then the device thickness and weight are reduced, but the current density in the non-display area increases significantly causing excessive heat generation
Solution Approach 1:
The outer common voltage line is divided into multiple segments (first outer common voltage line, second outer common voltage line, third outer common voltage line) separated by grooves. This segmentation distributes the current flow across multiple paths, reducing current density in any single segment and thereby reducing heat generation in the non-display area.
Solution Approach 2:
Grooves are introduced as intermediary structures between the segmented voltage lines. These grooves act as current redistribution channels that help evenly distribute the current across the non-display area, preventing localized overheating while maintaining the minimized non-display area design.
2Device complexity
If high current density is used in the non-display area to maintain compact design, then device complexity is reduced, but reliability decreases due to heat-induced degradation
Solution Approach 1:
The voltage line system is segmented into multiple parallel lines with grooves between them. This segmentation reduces current density in each individual line while maintaining the overall compact design, thereby improving reliability by reducing heat-induced degradation without significantly increasing device complexity.
Solution Approach 2:
The grooves are strategically positioned in specific locations within the non-display area to create local current redistribution zones. This local quality approach targets heat generation problems in specific high-current-density regions while maintaining efficient current flow in other areas, balancing reliability improvement with device complexity management.
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 design effectively minimizes and dissipates heat generated in the non-display area, enhancing the reliability and durability of the display device.
Implementation Method 1
As the non-display area is minimized, a density of current flows in the non-display area may be significantly high. As a result, much heat may be generated in the non-display area.
Data Source
AI summary
A display device may include a substrate, pixels, a first common voltage line, an outer common voltage trunk line, a first outer common voltage line, and a second outer common voltage line. The substrate may include a display area and a non-display area. The pixels may be disposed on the display area. The first common voltage line may be at least partially disposed on the display area. The outer common voltage trunk line may be disposed on the non-display area, may be electrically connected through the first common voltage line to the pixels, and may include a groove. The first outer common voltage line may protrude from the outer common voltage trunk line. The second outer common voltage line may protrude from the outer common voltage trunk line. The groove may be disposed between the second outer common voltage line and the first common voltage line.