Organic Light Emitting Display Demultiplexer White Balance
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Solution Overview
Problem
Conventional organic light emitting displays require a large number of output lines for data drivers, increasing manufacturing costs and complexity as the resolution and size of the display increase, due to the need for multiple data driving circuits to support the increasing number of pixels.
Innovation Solution
The implementation of demultiplexers and data capacitors reduces the number of output lines by distributing data signals across multiple second data lines, using a scan driver and data driver connected to scan and first data lines, and providing initialization power supplies with different voltages for red, green, and blue pixels to enhance white balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of pixels is increased to improve resolution and display size, then the image quality is improved, but the number of output lines required increases, leading to increased manufacturing cost and device complexity
Solution Approach 1:
The patent divides the data signal transmission into multiple time slots, with each output line sequentially transmitting data signals to different pixels during different periods. This temporal segmentation allows a reduced number of output lines to address a larger number of pixels by reuse of the same physical lines at different times.
Solution Approach 2:
The data driver operates in periodic cycles, sequentially selecting different groups of pixels (e.g., odd-numbered pixels in one period, even-numbered pixels in the next period) and transmitting their data signals through the output lines. This periodic multiplexing enables the same output lines to serve multiple pixel groups over time.
2Adaptability or versatility
If multiple data driving circuits are provided to support increasing pixels, then the pixel coverage is improved, but the manufacturing cost increases
Solution Approach 1:
Each output line is designed to perform multiple functions by sequentially serving different pixel groups at different time periods. The same physical output line transmits data to different sets of pixels during different time slots, eliminating the need for dedicated output lines for each pixel group and reducing the overall number of required lines.
Solution Approach 2:
The patent combines the data transmission function for multiple pixel groups into a single set of output lines by using time-division multiplexing. Instead of having separate output lines for each pixel group, the system merges their functions into shared lines that are activated sequentially for different groups.
3Ease of manufacture
If the number of output lines is reduced, then the manufacturing cost is lowered, but the data signal distribution complexity increases
Solution Approach 1:
The data driver pre-organizes data signals into groups corresponding to different pixel sets (e.g., odd pixels, even pixels) before transmission. By preparing and buffering the data signals in advance according to the time-division scheme, the system simplifies the real-time distribution complexity despite using fewer output lines.
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 significantly reduces the number of output lines in the data driver, lowering manufacturing costs and enabling improved white balance by adjusting voltage levels for each color pixel, resulting in a more efficient and cost-effective organic light emitting display.
Implementation Method 1
displays an image using an organic light emitting diode that generates light by the recombination of electrons and holes
Implementation Method 2
a plurality of data capacitors, each of the data capacitors being coupled with a respective one of the second data lines
Data Source
AI summary
Disclosed is an organic light emitting display that reduces the number of output lines and adjusts a white balance. A scan driver supplies scan signals to a plurality of scan lines. A data driver supplies data signals to a plurality of output lines. Demultiplexers are installed at the respective output lines, and supply the data signals to the plurality of data lines. Data capacitors are coupled with the data lines, and charge a voltage corresponding to the data signals. An image display device is coupled with the scan lines and the data lines, and includes red pixels having a red organic light emitting diode, green pixels having a green organic light emitting diode, and blue pixels having a blue organic light emitting diode. A first initialization power supply supplies a first voltage to the red pixels. A second initialization power supply supplies a second voltage to the green pixels. A third initialization power supply supplies a third voltage to the blue pixels. Voltages of the first, second, and third initialization power supplies are differently set, respectively.