Demultiplexer Data Line Routing for OLED Noise Reduction
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in efficiently supplying data signals to pixels due to overlapping scan and data signals, leading to potential display quality issues and lateral line noise.
Innovation Solution
The implementation of a demultiplexer (DEMUX) system that alternately couples odd-numbered and even-numbered data lines to pixels on different horizontal lines, allowing data signals to be supplied during specific horizontal periods while ensuring overlap with scan signals, thereby preventing lateral line noise and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data signals are supplied to pixels using conventional routing methods, then data signals can be transmitted to pixels, but lateral line noise occurs and display quality deteriorates due to overlapping scan and data signals
Solution Approach 1:
The patent segments the data lines into odd-numbered data lines and even-numbered data lines, and couples them to different horizontal lines (1st horizontal line for odd, 2nd horizontal line for even). This segmentation prevents overlapping between scan signals and data signals, eliminating lateral line noise while maintaining reliable data transmission to all pixels.
2Object-generated harmful factors
If data lines are physically separated for different horizontal lines, then lateral line noise is reduced, but device complexity increases due to additional routing requirements
Solution Approach 1:
The patent applies different coupling configurations to different horizontal lines: odd-numbered data lines are coupled to the 1st horizontal line while even-numbered data lines are coupled to the 2nd horizontal line. This local differentiation in coupling configuration enables noise reduction without requiring complete physical separation of all data lines, thus balancing noise suppression with routing complexity.
Data Source
AI summary
An organic light emitting display device includes a plurality of pixels, a data driver, and a plurality of demultiplexers. The pixels are in an area defined by scan lines and data lines. The data driver progressively supplies data signals to output lines every horizontal period. The demultiplexers are coupled to respective ones of the output lines. Each demultiplexer supplies data signals to a first number of data lines coupled to the demultiplexer during a horizontal period.