OLED Pixel Power Mesh Layout for Voltage Drop Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing OLED displays suffer from voltage drops due to parasitic resistance components in the wires supplying power supply voltage ELVDD, leading to inefficiencies and potential leakage currents.
Innovation Solution
The power supply voltage wires are formed in a mesh structure, with parallel initialization voltage lines shared between adjacent pixels and a driving voltage line formed in both vertical and horizontal directions, connected in a mesh to minimize voltage drops and leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply voltage wires are formed as simple linear connections, then device complexity is reduced, but voltage drop increases due to parasitic resistance
Solution Approach 1:
The power supply voltage wire is segmented into multiple sections with parallel connections between adjacent pixels. Each pixel receives power through its own dedicated wire segment, reducing the cumulative parasitic resistance effect and voltage drop across the display panel.
Solution Approach 2:
The wire structure transitions from a one-dimensional linear connection to a two-dimensional mesh structure. Power supply wires are arranged in both horizontal and vertical directions, creating multiple parallel pathways for current flow, which reduces equivalent resistance and voltage drop.
2Area of stationary object
If wire length is increased to cover larger display areas, then area coverage is improved, but parasitic resistance increases causing voltage drop
Solution Approach 1:
The display area is divided into smaller units with individual power supply connections. Each pixel or pixel group has its own wire segment, preventing the cumulative resistance effect of long continuous wires while maintaining comprehensive area coverage.
Solution Approach 2:
Power supply wires are extended into two dimensions with horizontal and vertical arrangements. This creates a grid-like structure that reduces the maximum distance any point on the display is from a power source, minimizing voltage drop across large areas.
3Reliability
If mesh structure is implemented for power supply wires, then voltage drop is reduced, but manufacturing complexity increases
Solution Approach 1:
The mesh structure is formed by combining horizontal and vertical wire layers that are manufactured using standard multi-layer PCB or thin-film deposition techniques. This merging of simple linear layers creates the complex mesh pattern without requiring new manufacturing processes.
Solution Approach 2:
The mesh structure is achieved by adding wires in a second dimension (vertical direction) to the traditional horizontal wire layout. This dimensional extension creates multiple parallel pathways for current while using conventional layer-by-layer manufacturing methods.
Data Source
AI summary
An organic light-emitting display device and a related manufacturing method of the organic light-emitting display device are disclosed. In one aspect, the organic light-emitting display device includes a plurality of pixels which are formed between a plurality of scan lines and a plurality of data signal lines. It also includes a plurality of initialization voltage lines which are formed in parallel with the plurality of scan lines and are shared between two adjacent pixels of a row to supply an initialization voltage to the two adjacent pixels. It also includes a driving voltage line which supplies a driving voltage to the plurality of pixels and includes a first voltage line formed in a vertical direction and a second voltage line that is connected between the two adjacent pixels and formed in a horizontal direction.