Organic Light Emitting Display Demultiplexer Circuit Design
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Solution Overview
Problem
Conventional organic light emitting displays require a large number of output lines in the data driver, increasing production costs as the resolution and size of the pixel portion increase, while maintaining uniform brightness remains a challenge.
Innovation Solution
The implementation of a data driver with demultiplexers that selectively supply data signals from a single output line to multiple data lines, along with parasitic capacitors formed from auxiliary power source lines and data lines, reduces the number of output lines needed and ensures uniform brightness by storing and distributing data signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of data lines is increased to support higher resolution and larger pixel portions, then the display resolution and size are improved, but the number of output lines in the data driver increases, leading to increased production cost
Solution Approach 1:
The data driver is segmented into multiple segments, where each segment drives a subset of data lines. This allows the total number of data lines to be increased without proportionally increasing the number of output lines, as each segment can share common output lines through demultiplexing techniques.
Solution Approach 2:
The patent introduces a time dimension by sequentially driving different subsets of data lines through multiple segments. Instead of all data lines being driven simultaneously by dedicated output lines, the system uses time-division multiplexing to reduce the spatial dimension of output lines required.
2Measurement precision
If more data integrated circuits are added to increase the number of output lines, then the display resolution and size can be improved, but the production cost increases
Solution Approach 1:
Each data integrated circuit is designed to perform multiple functions by sequentially driving different subsets of data lines through demultiplexers. This multi-functionality reduces the total number of data integrated circuits needed, thereby lowering production costs while maintaining high display resolution.
Solution Approach 2:
Demultiplexers are introduced as intermediary components between the data integrated circuits and the data lines. These demultiplexers enable a single output line to serve multiple data lines by selectively connecting them, reducing the need for additional data integrated circuits.
3Device complexity
If data signals are supplied to multiple data lines from a single output line using demultiplexers, then the number of output lines is reduced, but the uniformity of brightness across pixels may be affected
Solution Approach 1:
The patent applies local quality by optimizing the demultiplexer design and data signal distribution to ensure that each pixel receives the appropriate signal strength and timing. By carefully controlling the local characteristics of signal distribution, uniform brightness is maintained even though multiple pixels share common output lines through demultiplexing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration decreases the number of data integrated circuits required, lowering production costs and enables the display of images with uniform brightness by efficiently distributing data signals to pixels.
Implementation Method 1
a plurality of parasitic capacitors each formed from a single data line and the auxiliary power source line in an area where the single data line and the auxiliary power source line overlap. The parasitic capacitors are each configured to store charge corresponding to the data signal on the corresponding data line
Data Source
AI summary
Disclosed is an organic light emitting display which has a scan driver to supply scan signals to a plurality of scan lines, a data driver to supply data signal to output lines, with a demultiplexer on each output line to supply the data signal to a plurality of data lines is disclosed. The display also has a pixel portion comprising pixels connected to the scan lines, the data lines, and pixel power source lines. There is also a power source line placed between the pixel portion and the data driver to supply first power to the pixel power source lines, and a parasitic capacitor formed on each data line to charge voltage corresponding to the data signal. With this configuration, the number of output lines provided in a data driver is decreased, and an image is displayed with uniform brightness.