OLED Pad Unit Segmented Power Supply for Voltage Stability
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Solution Overview
Problem
The existing organic light emitting displays face challenges in stably supplying driving powers to the scan driver due to pressure failures at the pads, especially for gate high and low level voltages, which can lead to erroneous operation and instability in power delivery.
Innovation Solution
The design includes a pad unit with first and second pads for gate high level voltage and third and fourth pads for gate low level voltage, connected via power source supply lines that surround the display unit and couple the pads through the scan driver and emission control driver, ensuring stable voltage supply by distributing the power across different edges of the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pads are located at the edge of the pad unit to reduce dead space, then the area of the pad unit is reduced, but pressure failure of pads is more easily generated
Solution Approach 1:
The power source supply is segmented into multiple independent paths. Instead of relying on a single pad connection, the patent creates multiple separate power source supply lines (first and second power source supply lines) that connect different pads (first and second pads for VGH, third and fourth pads for VGL) to different terminals of the scan driver. This segmentation ensures that if one pad fails due to pressure issues, other pads can still supply power through alternative paths.
Solution Approach 2:
The patent implements redundant power source supply paths in advance to cushion against potential pad failures. By providing multiple parallel power source supply lines that can independently deliver VGH and VGL voltages, the system is prepared beforehand to handle pressure failures without causing erroneous operation. This redundant configuration acts as a protective measure against the reliability issues caused by edge-located pads.
2Productivity
If pad area is reduced to minimize dead space, then manufacturing efficiency is improved, but stable supply of driving powers becomes difficult
Solution Approach 1:
The power distribution network is divided into multiple segmented paths with dedicated power source supply lines for different voltage levels (VGH and VGL). Each supply line connects specific pads to specific terminals, creating a modular power distribution architecture that maintains stability even with reduced individual pad areas.
Solution Approach 2:
Different pads are assigned different functions and connected through dedicated supply lines with appropriate local characteristics. The first and second pads are specifically configured for VGH supply, while the third and fourth pads are configured for VGL supply, with each having its own optimized power source supply line that accounts for local electrical requirements and minimizes interference.
Data Source
AI summary
An organic light emitting display includes a display unit at the center of a panel and including a plurality of pixels at crossing regions of scan lines and data lines, a scan driver for supplying scan signals to the scan lines and on the panel, a pad unit on the panel and for supplying driving powers and control signals to the display unit and the scan driver, the pad unit including first and second pads for supplying a gate high level voltage to the scan driver and third and fourth pads and for supplying a gate low level voltage to the scan driver, a first power source supply line surrounding the display unit and coupling the first pad to the second pad via the scan driver, and a second power source supply line surrounding the display unit and coupling the third pad to the fourth pad via the scan driver.