Pixel Driver Circuit Layout for Higher-Resolution Displays
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Solution Overview
Problem
Existing display devices face limitations in increasing performance and resolution due to the width of transistors in light-emitting pixel drivers exceeding a critical value, which hinders the integration density of light-emitting pixel drivers.
Innovation Solution
The display device incorporates a circuit layer with light-emitting pixel drivers arranged in specific directions, data and auxiliary lines, and connection electrodes to optimize the layout, allowing for increased integration density and improved resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the first transistor is increased to secure current characteristics, then the current characteristics are improved, but the width of the light-emitting pixel drivers increases, limiting integration density
Solution Approach 1:
The patent introduces auxiliary lines extending in the first direction (vertical) and second auxiliary lines extending in the second direction (horizontal), creating a two-dimensional routing network that allows current to reach pixel drivers through multiple paths, reducing the need to increase transistor width
Solution Approach 2:
The auxiliary lines and auxiliary connection electrodes act as intermediaries that facilitate current delivery to pixel drivers located in bypass areas, enabling proper current distribution without requiring increased transistor dimensions
2Power
If the width of light-emitting pixel drivers is increased to improve current delivery, then current delivery is improved, but the integration density and resolution are limited
Solution Approach 1:
The patent divides the current delivery path into multiple segments by introducing auxiliary lines and auxiliary connection electrodes, allowing current to be distributed through multiple smaller pathways rather than requiring a single wide path
Solution Approach 2:
By routing current through auxiliary lines in both first and second directions with auxiliary connection electrodes providing vertical connections, the patent creates a three-dimensional current distribution network that maintains high current delivery without increasing driver width
Data Source
AI summary
A display device comprises a substrate comprising a display area in which emission areas are arranged and a non-display area which is disposed around the display area; a circuit layer disposed on the substrate; and an element layer disposed on the circuit layer and comprising light emitting elements disposed in the emission areas. The circuit layer comprises light-emitting pixel drivers electrically connected to the light emitting elements and arranged in a first direction and a second direction; data lines extending in the second direction and transmitting data signals to the light-emitting pixel drivers; first auxiliary lines extending in the first direction; second auxiliary lines extending in the second direction and neighboring the data lines; and auxiliary connection electrodes disposed between adjacent first auxiliary lines of the first auxiliary lines and spaced apart from the adjacent first auxiliary lines.