Display Substrate Mesh Wiring for Voltage Drop Compensation
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Solution Overview
Problem
OLED display substrates experience poor brightness uniformity due to significant voltage drops along unidirectional transmission lines, leading to increased power consumption and differential degradation of light-emitting materials.
Innovation Solution
A display substrate design featuring a mesh structure connected to proximal and distal end wiring forms a loop, enabling bidirectional transmission of driving voltage and reducing impedance, thereby compensating voltage drops and enhancing brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If unidirectional transmission lines are used to supply driving voltage, then the device complexity is reduced, but brightness uniformity deteriorates due to significant voltage drops
Solution Approach 1:
The single unidirectional transmission line is segmented into multiple transmission paths by introducing a mesh structure with multiple nodes and branches. This segmentation allows voltage to be distributed through multiple parallel paths, reducing the voltage drop along each individual path and improving brightness uniformity across the display substrate.
Solution Approach 2:
The transmission line structure is transformed from a one-dimensional unidirectional line to a two-dimensional mesh network. This dimensional change creates multiple spatial paths for voltage transmission, enabling voltage to reach different regions of the display substrate through multiple routes and thereby reducing voltage drops and improving brightness uniformity.
2Ease of manufacture
If unidirectional transmission lines are used, then manufacturing is simplified, but power consumption increases due to voltage drops
Solution Approach 1:
The transmission line is segmented into multiple smaller transmission segments within the mesh structure. Each segment carries a portion of the total current, reducing the I²R losses in each segment and thereby reducing overall power consumption while maintaining ease of manufacture through standardized mesh unit replication.
Solution Approach 2:
Multiple transmission paths are merged into a unified mesh structure that works together to supply voltage. The combined effect of multiple parallel paths reduces total resistance and power loss, while the mesh can be manufactured using standard semiconductor fabrication processes.
3Device complexity
If unidirectional transmission lines are used, then the wiring structure is simple, but light-emitting materials degrade differently across the display
Solution Approach 1:
The wiring structure is segmented into multiple transmission paths within the mesh, creating more uniform voltage distribution across the display substrate. This uniform voltage delivery ensures that light-emitting materials throughout the display experience similar operating conditions, leading to more uniform degradation patterns and extended overall lifespan.
Solution Approach 2:
The mesh structure creates multiple equipotential regions across the display substrate by providing multiple voltage supply paths. This reduces potential differences between different regions, ensuring more uniform voltage and current distribution to light-emitting materials, thereby promoting uniform aging characteristics and improving reliability.
Data Source
AI summary
A display substrate, including: a display region and two non-display regions provided at two opposite sides of the display region, respectively; proximal end wiring and distal end wiring which are provided in the two non-display regions, respectively, wherein the proximal end wiring is wiring proximal to a driving chip to be employed to provide a driving voltage to the display substrate, and the distal end wiring is wiring distal to the driving chip; pixels provided within the display region; and data lines provided within the display region, wherein each data line is connected to the proximal and distal end wirings, respectively. Each of the pixels is provided with a power introduction structure, the power introduction structures of the pixels are connected to each other to form a mesh structure, and the mesh structure is connected to the proximal and distal end wiring, respectively, to form an electrically-conductive path.