Segmented OLED Drive Circuits for Voltage Drop Reduction
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Solution Overview
Problem
In large-format, high-definition organic electroluminescent display panels with wide screen ratios, such as 16:9, the long scan lines and supply voltage lines experience significant voltage drops due to wire resistance, leading to signal delays and inadequate emission drive current for desired luminance gradations, degrading display quality.
Innovation Solution
The display apparatus is designed with a substrate layout where the distance between peripheral edge portions in the column direction is shorter than in the row direction, featuring power source lines in the row direction and power supply lines at the edge in the column direction, connected via nodes, allowing for efficient current flow and reduced voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel is enlarged to achieve wide screen and high definition, then the display area and resolution are improved, but the voltage drop and signal delay increase due to longer scan lines and supply voltage lines
Solution Approach 1:
The display panel is divided into multiple blocks, with each block having its own scan line drive circuit and data line drive circuit. This segmentation allows each block to operate independently with shorter signal lines, reducing voltage drop and signal delay while maintaining overall large display area and high definition.
2Area of stationary object
If the scan lines and supply voltage lines are made longer to cover larger display area, then the display coverage is improved, but the voltage drop increases due to wire resistance
Solution Approach 1:
The display panel is segmented into multiple blocks, each with dedicated drive circuits. This reduces the length of scan lines and supply voltage lines within each block, minimizing voltage drop due to wire resistance while still achieving large overall display coverage through the combination of multiple blocks.
3Manufacturing precision
If the signal lines are extended to achieve high definition across large area, then the display resolution is improved, but the signal delay increases
Solution Approach 1:
The display panel is divided into multiple blocks with independent drive circuits for each block. This segmentation reduces the distance signals must travel within each block, decreasing signal delay while maintaining high definition resolution across the entire large-area display through coordinated operation of all blocks.
Data Source
AI summary
A display apparatus includes a display panel having a plurality of display pixels two-dimensionally arrayed display pixels having pixel drive circuits and light emitting devices near at intersections of a plurality of scan lines and a plurality of data lines laid out in a row direction and in a column direction so as to be orthogonal to each other, a scan driver which applies a scan signal to the scan lines at a predetermined timing, a data driver which supplies a gradation signal corresponding to display data to the display pixels via the data lines, and a pair of power source drivers which apply a supply voltage to both ends of a plurality of power supply lines laid out in the column direction at a predetermined timing.