Display Pixel Voltage Line Capacitor Layout for LED Stability
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Solution Overview
Problem
Existing display devices face challenges in maintaining stable voltage levels for light-emitting diodes (LEDs), leading to fluctuations that affect image quality and efficiency.
Innovation Solution
A display device design incorporating a lower pattern that overlaps with a driving voltage line to form a capacitor, along with a hold capacitor to stabilize the voltage at the anode of the LED, using a conductive layer and insulating layers to enhance voltage maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display device structure is used, then the device is simpler to manufacture, but voltage fluctuations occur that affect LED performance and image quality
Solution Approach 1:
The patent combines the lower pattern (first conductive layer) with capacitor functionality by having it overlap with the driving voltage line through insulating layers. This merging of structural and functional elements stabilizes voltage without requiring completely separate capacitor components, thus improving reliability while controlling complexity
Solution Approach 2:
The patent introduces insulating layers (second insulating layer and third insulating layer) as intermediaries between the lower pattern and the driving voltage line. These intermediary layers enable the formation of a capacitive structure that stabilizes voltage while maintaining proper electrical isolation, resolving the contradiction between voltage stability and structural simplicity
2Reliability
If the driving voltage line is routed without overlapping patterns, then the device structure is simpler, but voltage fluctuations occur that reduce LED efficiency and image quality
Solution Approach 1:
The patent merges the driving voltage line routing with capacitor formation by having the lower pattern overlap with the driving voltage line. This combined approach provides voltage stabilization while using existing conductive layers and insulating layers, maintaining ease of manufacture through standard layering processes
Solution Approach 2:
The lower pattern serves multiple functions: it acts as a conductive element in the display structure and simultaneously forms a capacitor with the driving voltage line to stabilize voltage. This multi-functionality improves voltage stability without adding separate manufacturing steps, maintaining ease of manufacture
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
The design stabilizes voltage levels, reducing fluctuations and maintaining consistent LED performance, thereby improving image quality and efficiency.
Implementation Method 1
The driving voltage line overlaps the lower pattern to form a first capacitor
Data Source
AI summary
A display device includes a lower pattern disposed on a substrate, an active pattern disposed on the lower pattern, a driving voltage line connected to the source region of the active pattern, and a pixel electrode connected to the drain region of the active pattern. The active pattern includes a source region, a channel region, and a drain region and the channel region of the active pattern overlaps the lower pattern in a plan view. The driving voltage line overlaps the lower pattern to form a first capacitor.