OLED Data Distribution Unit for High-Resolution Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-resolution organic light emitting diode (OLED) displays face challenges in achieving sufficient data compensation time while maintaining complexity and cost efficiency, leading to potential spot generation due to shortened data writing and scan periods.
Innovation Solution
The implementation of a 2:n demultiplexer system, where data signals for red, green, and blue subpixels are sequentially output and stored in capacitive elements during a writing period, with specific clock signal control to ensure overlapping data transmission and extended scan periods for the green subpixel, allowing for increased data compensation time and reduced IC size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels is increased to improve resolution, then the number of data lines must be proportionally increased, but this makes the data driver circuit more complicated and increases manufacturing costs
Solution Approach 1:
The patent segments the data signal transmission by dividing it into multiple color channels (R, G, B) that are sequentially transmitted through shared data lines. The data driver circuit is segmented into multiple output lines that can be time-multiplexed, reducing the total number of physical data lines required while maintaining high resolution display capability.
Solution Approach 2:
The patent implements periodic action by sequentially transmitting data signals for different colors (R, G, B) in repeating cycles. Each horizontal period is divided into writing periods for different color channels, allowing data to be written to pixels in a time-multiplexed manner. This periodic transmission reduces the number of simultaneous data lines needed.
2Loss of time
If the data writing period is increased to allow complete data writing through 1:n demultiplexer, then the scan period is relatively shortened, but this shortens the data compensation time and causes spot generation
Solution Approach 1:
The patent segments the data writing process into separate writing periods for different color channels (R, G, B) within each horizontal period. By dividing the writing period into multiple color-specific sub-periods, the system can sequentially write data to all pixels for each color without requiring a single extended writing period, thus maintaining adequate scan periods and compensation time.
Solution Approach 2:
The patent uses periodic action by implementing multiple writing periods for different colors within each horizontal period. The data driver sequentially outputs data signals for R, G, and B colors in repeated cycles, allowing complete data writing for high-resolution displays while maintaining sufficient scan periods and compensation time for each color channel.
3Measurement precision
If the horizontal period is decreased to achieve higher resolution, then the data writing period becomes insufficient for complete data writing through 1:n demultiplexer
Solution Approach 1:
The patent implements periodic action by dividing each horizontal period into multiple writing periods for different color channels (R, G, B). This allows the system to achieve higher resolution with shorter horizontal periods by efficiently utilizing time-multiplexed data writing for each color, ensuring complete data writing within the compressed time frame.
Solution Approach 2:
The patent applies preliminary action by pre-organizing data signals into color-specific groups (R, G, B) before transmission. The data driver sequentially outputs data signals for different colors in advance of the actual pixel scanning, allowing the demultiplexer to efficiently route data to the correct pixels during their respective writing periods.
Data Source
AI summary
An organic light emitting diode (OLED) display includes: a display unit comprising a plurality of data lines, a plurality of scan lines, and a plurality of pixels coupled to corresponding data lines of the data lines and corresponding scan lines of the scan lines; a scan driver configured to supply a plurality of scan signals to the scan lines; a data driver configured to: output a plurality of first data signals among a plurality of data signals through a plurality of first output lines among a plurality of output lines, output a plurality of second data signals among the data signals through the first output lines, and output a plurality of third data signals among the data signals through a plurality of second output lines among the output lines, wherein the first data signals represent a first color, the second data signals represent a second color, and the third data signals represent a third color; and a data distribution unit configured to: transmit the first data signals to a plurality of corresponding first data lines among the data lines according to a first clock signal, transmit the second data signals to a plurality of corresponding second data lines among the data lines according to a second clock signal, and transmit the third data signals to a plurality of corresponding third data lines among the data lines.