Common Voltage Electrode Overlap for Cooler Narrow-Bezel Displays
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Solution Overview
Problem
As the non-display area in display devices decreases, the heat generation of power supply lines increases due to reduced space, necessitating a solution to minimize heat while maintaining a reduced non-display area.
Innovation Solution
The implementation of a common voltage electrode layer that overlaps with and is electrically connected to the common voltage supply line and driving circuit, extending from the non-display area towards the display area, helps in reducing heat generation by covering a portion of the supply line and circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the non-display area is reduced to expand the display area, then the display area ratio is improved, but the heat generation of power supply lines increases
Solution Approach 1:
The patent introduces a third dimension by stacking the common voltage electrode layer above the common voltage supply line in the vertical direction. This spatial rearrangement allows the supply line to be covered without expanding the planar non-display area, thus resolving the contradiction between maintaining small non-display area and reducing heat generation.
Solution Approach 2:
The common voltage electrode layer acts as an intermediary element that is introduced between the common voltage supply line and the surrounding environment. This intermediate structure provides thermal management functionality by covering the supply line, thereby reducing heat generation without affecting the display area.
2Temperature
If the common voltage electrode layer covers the common voltage supply line and driving circuit, then heat generation is reduced, but the device structure becomes more complex
Solution Approach 1:
The common voltage electrode layer is designed to serve multiple functions simultaneously: it provides thermal management by covering the power supply line to reduce heat generation, maintains electrical connectivity through proper material selection, and integrates with existing device layers. This multi-functionality reduces the need for separate thermal management components, thereby limiting the increase in device complexity.
Data Source
AI summary
A display device includes: a first light-emitting diode at a first display area; a second light-emitting diode at a second display area outside of the first display area; a plurality of sub-pixel circuits at the first display area; a driving circuit at the second display area, and to provide a scan signal to each of the plurality of sub-pixel circuits; a common voltage supply line at a non-display area outside of the second display area; and a common voltage electrode layer on the common voltage supply line, and electrically connected to the common voltage supply line. The second light-emitting diode, a portion of the common voltage electrode layer, and a portion of the driving circuit overlap with each other at the second display area.