Multiplexer Time-Division Data Voltage Distribution for OLED Drivers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In organic light emitting display devices, the increasing resolution leads to larger data drivers, and the internal compensation method results in data voltage from previous frames affecting current data due to floating data lines, requiring complex manufacturing of data drivers to manage output order and initialization voltages.
Innovation Solution
The implementation of a multiplexer that distributes data voltages in a time division manner between data lines, using output buffers and initialization voltages to prevent floating states and ensure accurate voltage sensing, thereby reducing data driver size and eliminating the need for complex output order management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a multiplexer is used to distribute data voltages to reduce data driver size, then the data driver size is reduced, but data lines not receiving data voltage enter a floating state causing previous frame data to affect current data
Solution Approach 1:
The patent applies preliminary action by initializing data lines with initialization voltage before they receive data voltage through the multiplexer. This prevents floating state issues and ensures that previous frame data does not affect current data display, resolving the reliability problem while maintaining the data driver size reduction benefit
Solution Approach 2:
The patent introduces an initialization voltage line as an intermediary between the multiplexer and data lines. This intermediary provides a stable reference voltage to data lines during non-active periods, preventing them from entering a floating state and ensuring accurate current frame data display
2Device complexity
If data voltages are distributed using a multiplexer in time division manner, then the number of output buffers is reduced, but complex output order management is required during manufacturing
Solution Approach 1:
The patent segments the data driver into multiple independent output buffers, each capable of driving specific data lines. This segmentation allows flexible configuration and simplifies manufacturing by enabling independent testing and calibration of each output buffer without affecting others
Solution Approach 2:
The patent implements dynamic output order management through controllable switching elements that can route data voltages from different output buffers to different data lines based on timing signals. This dynamic configuration capability allows the system to adapt to different manufacturing requirements while maintaining ease of implementation
Data Source
AI summary
An organic light emitting display device using a multiplexer includes a display panel, a data driver, and a multiplexer. The display panel includes first to fourth data lines and first to fourth pixels respectively connected to the first to fourth data lines. The data driver includes a first output buffer supplying a data voltage to the first and third data lines and a second output buffer supplying a data voltage to the second and fourth data lines. The multiplexer distributes the data voltage from the first output buffer to the first and third data lines in a time division manner and distributes the data voltage from the second output buffer to the second and fourth data lines in a time division manner. The multiplexer connects a data line, which is not connected to the first and second output buffers, among the first to fourth data lines, to an initialization voltage line providing an initialization voltage.