Array Base Plate Power-Line Layout for OLED Microdisplay IR Drop
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Solution Overview
Problem
Existing silicon-based OLED micro displays face challenges in achieving stable and uniform luminous brightness due to issues with power signal conductivity and IR Drop problems in the pixel driving circuits.
Innovation Solution
The array base plate design includes a novel pixel driving circuit with a first power signal line split into two parts on different layers, enhancing conductivity and reducing IR Drop, along with additional control modules and transistors to stabilize current flow and brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single-layer power signal line is used in the pixel driving circuit, then the device structure is simpler, but the conductivity is insufficient and IR Drop problems occur
Solution Approach 1:
The first power signal line is segmented into two distinct parts: a first part on the first layer and a second part on the second layer. This segmentation allows the power signal path to be divided across multiple layers, reducing current density and IR Drop in each individual segment while maintaining overall connectivity to the light emitting device.
Solution Approach 2:
The power signal line transitions from a two-dimensional single-layer configuration to a three-dimensional multi-layer configuration. By utilizing the vertical dimension (different layers), the patent creates a stacked power delivery path that reduces electrical resistance and improves conductivity without increasing the planar footprint of the pixel circuit.
2Reliability
If additional control modules and transistors are added to stabilize current flow, then brightness uniformity improves, but circuit complexity increases
Solution Approach 1:
The second control module acts as an intermediary between the multi-layer power signal line and the light emitting device. It receives power signals from both the first and second parts of the power signal line and regulates their combined output, stabilizing the current flow to the light emitting device and ensuring uniform brightness across pixels.
Solution Approach 2:
The patent merges multiple power signal paths (first part and second part from different layers) into a single regulated power delivery path through the second control module. This combining approach allows the circuit to leverage the advantages of multi-layer conductivity while maintaining a unified and stable power supply to the light emitting device.
Data Source
AI summary
An array base plate includes a substrate; a plurality of sub-pixels; and a plurality of gate lines and a plurality of data lines, wherein the plurality of gate lines intersect with the plurality of data lines, each of the sub-pixels is located at a position limited by two adjacent gate lines and two adjacent data lines, and each of the sub-pixels includes a pixel driving circuit and a light emitting device that are connected; wherein the pixel driving circuit includes: a drive module and a first control module, the pixel driving circuit further includes an auxiliary anode, the auxiliary anode is located between the anode and the substrate, and the auxiliary anode is electrically connected to the anode; the first power signal line includes a first part and a second part that are electrically connected.