OLED Data Driver Parasitic Capacitance Compensation
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Solution Overview
Problem
In organic light emitting diode (OLED) displays, the increasing number of pixels to improve resolution leads to a more complex data driver circuit and higher manufacturing costs, with coupling effects between neighboring data lines causing signal interference.
Innovation Solution
A display device with a data signal generator that compensates for the coupling effects of parasitic capacitors between data lines by generating output signals based on the coupling effects, reducing interference and simplifying the data driver circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels is increased to improve resolution, then the display quality is improved, but the data driver circuit becomes more complex and manufacturing cost increases
Solution Approach 1:
The patent divides the data signal transmission into two separate time periods: a writing period for writing data signals to pixel electrodes, and a scan period for scanning the data lines. This temporal segmentation allows the data driver to reuse the same data lines for different purposes at different times, reducing the total number of data lines required and simplifying the driver circuit while maintaining high resolution
Solution Approach 2:
The patent implements dynamic signal routing by sequentially switching between writing mode and scanning mode. During the writing period, data signals are written to pixel electrodes; during the scan period, the same data lines are scanned to read back signals. This dynamic reuse of circuit resources reduces complexity without sacrificing resolution
2Measurement precision
If the number of pixels is increased to improve resolution, then the display quality is improved, but manufacturing cost increases
Solution Approach 1:
By segmenting the operation into writing and scanning periods, the patent reduces the number of data lines needed from being proportional to the number of pixels to a fixed smaller number. This reduction directly lowers manufacturing cost while maintaining high resolution capability
Solution Approach 2:
The data lines serve multiple functions: they write data signals to pixel electrodes during the writing period and are scanned during the scan period. This multi-functionality reduces the total number of lines required, simplifying manufacturing and reducing cost
3Productivity
If data signals are transmitted through multiple data lines, then more pixels can be driven, but coupling effects between neighboring data lines cause signal interference
Solution Approach 1:
The patent uses periodic action by dividing data signal transmission into distinct time periods: writing period for writing data and scan period for scanning. This temporal separation prevents simultaneous signal activity on multiple lines that would cause coupling interference, while still enabling multiple pixels to be driven through sequential operations
Solution Approach 2:
The patent extracts the harmful coupling effect by separating the writing operation from the scanning operation in time. During the writing period, data signals are written without scanning; during the scan period, scanning occurs without simultaneous writing. This extraction of overlapping operations eliminates the source of signal interference
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
The solution effectively reduces coupling effects between neighboring data lines, improving signal integrity and reducing the complexity and cost of the data driver circuit, thereby enhancing the performance and efficiency of OLED displays.
Implementation Method 1
a data signal generator configured to generate the output signal based on a coupling effect of a first parasitic capacitor formed between the first data line and the second data line and a coupling effect of a parasitic capacitor of a data line formed by the first data line and second data line
Data Source
AI summary
There is provided a display device including a display including a first pixel connected to a first data line and a second pixel connected to a second data line, a data signal generator configured to generate an output signal, and a signal divider configured to divide the output signal, to generate a first data signal and a second data signal, and to apply the first data signal and the second data signal to the first data line and the second data line, respectively, wherein the data signal generator is configured to generate the output signal based on a coupling effect of a first parasitic capacitor formed between the first data line and the second data line and a coupling effect of a parasitic capacitor of a data line formed by the first data line and second data line.