Scan Driver Parallel Mode for Black Frame Insertion in OLED Displays
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Solution Overview
Problem
High-resolution organic light emitting display devices experience motion blur due to short durations of black image display, which is insufficient to effectively prevent blur when frame rates increase to 30 frames per second.
Innovation Solution
An organic light emitting display device and method that includes a data driver, scan driver, and controller, utilizing first and second scan driving circuits and a switch unit to maintain a black image for a longer duration by transmitting scan signals sequentially during first frames and concurrently during second frames, allowing for parallel operation of scan driving circuits during black frame insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the frame rate is increased to 30 fps at high resolution, then the display quality and resolution are improved, but the time for black image display becomes very short causing motion blur
Solution Approach 1:
The scan driver dynamically switches between sequential and parallel operating modes based on the frame type. During black frame insertion, the scan driver operates in parallel mode where multiple scan driving circuits transmit scan signals concurrently to multiple scan lines, thereby reducing the total scanning time and extending the effective black image display duration to prevent motion blur
Solution Approach 2:
The scan driver is divided into multiple independent scan driving circuits (first scan driving circuit, second scan driving circuit, etc.), each capable of independently transmitting scan signals to different scan lines. This segmentation enables parallel operation during black frame insertion, allowing simultaneous scanning of multiple lines and effectively extending the black image display time
2Device complexity
If sequential scan signal transmission is used during black frames, then the circuit operation is simple, but the black image display time is insufficient to prevent motion blur
Solution Approach 1:
The scan driver dynamically switches between sequential and parallel operating modes based on the frame type. During black frame insertion, the scan driver operates in parallel mode where multiple scan driving circuits transmit scan signals concurrently to multiple scan lines, thereby reducing the total scanning time and extending the effective black image display duration to prevent motion blur
Solution Approach 2:
The scan driver is divided into multiple independent scan driving circuits (first scan driving circuit, second scan driving circuit, etc.), each capable of independently transmitting scan signals to different scan lines. This segmentation enables parallel operation during black frame insertion, allowing simultaneous scanning of multiple lines and effectively extending the black image display time
Data Source
AI summary
A light emitting display is configured to reduce or prevent motion blur by shortening a time that a black frame is displayed between image frames. One embodiment includes display region, a data driver, a scan driver, and a controller. The display region displays frames of images according to a data signal and a scan signal. The data driver transmits data for displaying first frames and second (black) frames between the first frames. The scan driver includes first and second scan driving circuits for transmitting scan signals, and a switch unit for selectively coupling the first and second scan driving circuits. The scan driver transmits scan signals sequentially during the first frames and transmits scan signals to at least two of the scan lines concurrently by driving the first and second scan driving circuits in parallel during the second frames. The controller transmits a driving control signal to control the switch.