Demultiplexer for OLED Data Driver Complexity Reduction
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Solution Overview
Problem
Conventional organic electroluminescent displays face challenges with increased complexity and production costs due to the direct connection of data drivers to a large number of data lines, leading to increased production costs and circuit mounting space requirements, as well as issues with stationary patterns arising from demultiplexing.
Innovation Solution
A display device with a demultiplexer integrated between the data driver and panel, utilizing demultiplexing circuits to distribute data currents across multiple data lines, reducing the complexity and eliminating stationary patterns by ensuring an integer multiple of data lines corresponds to the number of sub-pixels, thereby simplifying the data driver structure and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data drivers are directly connected to a large number of data lines, then data transmission capability is improved, but device complexity and production cost increase
Solution Approach 1:
The patent divides the data transmission system into segments by introducing a demultiplexer that splits a single data line into multiple sub-data lines. Each sub-data line connects to a specific group of pixels, reducing the complexity of the data driver while maintaining the capability to transmit data to all pixels. The demultiplexer acts as an intermediate stage that segments the data distribution task.
Solution Approach 2:
The demultiplexer serves as an intermediary component between the data driver and the pixel array. It receives data signals from the data driver through a single data line and distributes them to multiple sub-data lines, thereby mediating the connection and reducing the direct complexity between the data driver and the large number of pixels.
2Device complexity
If data drivers are directly connected to all data lines, then data transmission is simplified, but production cost and mounting space increase
Solution Approach 1:
The data transmission path is segmented into two stages: first from the data driver to the demultiplexer through a single data line, then from the demultiplexer to multiple pixel groups through sub-data lines. This segmentation reduces the number of direct connections required from the data driver, lowering production cost and mounting space while maintaining transmission simplicity.
Solution Approach 2:
Multiple sub-data lines are combined into a single data line for connection to the data driver. The demultiplexer integrates the function of distributing signals from this single combined data line to multiple sub-data lines, thereby reducing the number of connections at the data driver端 and simplifying the manufacturing process.
3Device complexity
If demultiplexing is used to reduce data lines, then device complexity is reduced, but stationary patterns may arise
Solution Approach 1:
The patent implements dynamic switching within each demultiplexing circuit using switching transistors that are controlled by scan signals. This dynamic switching allows the circuit to adaptively route data signals to the correct sub-data lines based on the current scan cycle, preventing stationary patterns while maintaining reduced device complexity. The switching elements introduce temporal variation that eliminates fixed pattern defects.
Solution Approach 2:
The demultiplexing operation is performed periodically in sync with the scan signal cycles. Each demultiplexing circuit operates in a periodic manner, switching between different sub-data lines according to the scan sequence. This periodic action ensures that all pixels receive their data signals uniformly over time, preventing stationary patterns while maintaining the simplified device structure.
Data Source
AI summary
A display device including plural pixels, plural scan lines for applying scan signals to the pixels, plural first data lines for transmitting first data currents to the pixels, a scan driver for outputting the scan signals, a demultiplexer including plural demultiplexing circuits for demultiplexing second data currents into the first data currents, and for transmitting the first data currents to the plural first data lines, and a data driver for transmitting the second data currents. A demultiplexing circuit demultiplexes one of the second data currents into at least two first data currents, and transmits them to at least two first data lines. The number of the at least two first data lines is an integer multiple of the number of sub-pixels in each pixel. A display device and a demultiplexer having a simple structure data driver, where a stationary pattern due to demultiplexing is reduced or eliminated, can be provided.