OLED Demultiplexer Data Line Architecture for Signal Timing
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Solution Overview
Problem
Conventional OLED devices face challenges in providing sufficient time to supply and transmit data signals to pixels due to the limited number of data driving circuits, leading to poor image quality as the capacitors are not fully charged, and there is not enough time to transmit the stored data signal, resulting in inadequate brightness and image quality.
Innovation Solution
The OLED device employs a demultiplexer that supplies data signals to at least two columns of pixels during a previous scan period and transmits these signals to the pixels during the present scan period, utilizing double data lines and a data line selector to ensure sufficient time for data signal transmission and charging, thereby addressing the limitations of conventional systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of data driving circuits is reduced to match the number of data lines, then the area and fabrication cost are reduced, but the time required to supply and transmit data signals becomes insufficient
Solution Approach 1:
The patent applies preliminary action by supplying data signals to data lines during the previous horizontal period before the pixels are selected. This allows the data signals to be prepared in advance and transmitted to the pixels during the current horizontal period when the pixels are active, ensuring sufficient transmission time without requiring additional data driving circuits.
2Loss of time
If data signals are supplied to data lines during the current scan period, then the transmission time is reduced, but the capacitors are not fully charged resulting in poor image quality
Solution Approach 1:
The patent supplies data signals to the data lines during the previous horizontal period in advance, allowing the capacitors associated with the data lines to be fully charged before the pixels are selected. This preliminary charging ensures that when the pixels are activated during the current horizontal period, they receive fully charged data signals, resulting in proper brightness and high image quality.
3Loss of time
If more data driving circuits are provided, then the data signal transmission time is sufficient, but the area and fabrication cost increase
Solution Approach 1:
The patent makes the data lines serve multiple functions by using them both for data signal transmission and for storing data signals during the previous horizontal period. The data lines act as temporary storage (latch) for the data signals, eliminating the need for separate data driving circuits for each data line while ensuring sufficient transmission time.
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 approach ensures that data signals are supplied and transmitted for a sufficient time, allowing for proper charging and emission of light with brightness corresponding to the data signal, thereby improving image quality by ensuring sufficient time for data signal transmission and charging.
Implementation Method 1
The light emitting diode emits light with brightness corresponding to the amount of driving current that is supplied to an anode electrode
Data Source
AI summary
An organic light emitting display (OLED) device having a demultiplexer and a method of operating the OLED are disclosed. In the OLED device, each pixel column is provided two data lines, and each data line is connected to odd or even row pixels of the column. Accordingly, a data signal can be supplied to one of the data lines during one scan period, and transmitted to the corresponding pixels during a next scan period. Thus, because the data driver is only driving half the pixels of the column, the driving time is reduced.