OLED Controller Clock Synchronization for Sensing Data Skew
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Solution Overview
Problem
Organic light emitting display devices face image abnormalities due to degradation of circuit elements in sub pixels, leading to inaccurate brightness representation and sensing errors during data transmission, which can result in sensing and compensation failures.
Innovation Solution
An organic light emitting display device with a data driver and controller that senses sub pixel characteristic parameters, generates compensation data, and transmits it using a synchronized clock signal to improve precision and reduce errors, thereby preventing image distortions and failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sensing data for characteristic parameter is transmitted during overlapping interval with clock signal, then transmission efficiency is improved, but skew and distortion occur in sensing data
Solution Approach 1:
The patent introduces a synchronization signal as an intermediary between the clock signal and sensing data. The synchronization signal includes a clock signal reception confirmation signal that indicates whether the clock signal was successfully received, allowing the sensing data to be transmitted during overlapping intervals while maintaining precision through the mediating synchronization mechanism.
Solution Approach 2:
The patent applies preliminary action by transmitting the clock signal reception confirmation signal before the sensing data. This allows the receiving end to prepare for accurate data reception by first confirming clock signal status, thereby preventing skew and distortion while maintaining transmission efficiency.
2Measurement precision
If sensing data is transmitted separately from clock signal, then measurement precision is improved, but transmission time increases
Solution Approach 1:
The patent merges the clock signal and sensing data transmission by allowing them to be transmitted during overlapping intervals. The synchronization signal acts as a bridge that enables both signals to share the transmission medium simultaneously, reducing total transmission time while maintaining precision through the synchronization mechanism.
3Speed
If sensing data is transmitted during overlapping interval, then transmission speed is improved, but skew is generated
Solution Approach 1:
The patent implements feedback through the clock signal reception confirmation signal, which provides real-time information about clock signal reception status. This feedback mechanism allows the system to adjust and maintain accurate timing relationships even when transmitting sensing data during overlapping intervals, thereby achieving high speed without sacrificing precision.
Data Source
AI summary
The present exemplary embodiments relate to devices and methods of processing data obtained by sensing a characteristic parameter of a sub pixel. A controller which receives a first clock signal and sensing data output from a data driver generates a second clock signal having a same phase as the first clock signal and outputs image data that is compensated based on the sensing data in accordance with the generated second clock signal to the data driver. By doing this, the controller generates the second clock signal using a part of the first clock signal output from the data driver and transmits the image data so that a skew or signal distortion which may be generated at the time of transmitting/receiving data is suppressed to improve sensing and compensation precision and suppress an image abnormality due to the sensing and compensation failure.