LED Array Line Scan Synchronization for Image Tearing
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Solution Overview
Problem
Conventional scan-type display apparatuses experience image tearing or interruption when the synchronization control signal is non-periodic and the backlight module is a scanning backlight, as the existing driving methods fail to synchronize the light emission effectively with the image refresh.
Innovation Solution
A scan-type display apparatus with a light emitting diode (LED) array having a common cathode configuration and a driving device comprising a control module and a driver module, where the driver module outputs input voltage to the scan lines sequentially without overlapping in time to drive the LEDs in a line scan manner, generating an image refresh signal related to the last line of each line scan cycle to synchronize image refreshment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the backlight module is a scanning backlight module that emits light in a line scan manner triggered by a non-periodic synchronization control signal, then power consumption is reduced and display flexibility is improved, but image tearing or image interruption occurs
Solution Approach 1:
The driver module generates an image refresh signal based on the output of the input voltage to the scan lines, creating a feedback mechanism that tracks the actual line scan progress. This feedback signal is used to synchronize the image refresh timing, ensuring that image data is updated only when the line scan has completed, thereby preventing image tearing or interruption while maintaining the power-saving benefits of line scan backlighting
Solution Approach 2:
The system performs preliminary synchronization by generating the image refresh signal in advance based on the line scan completion timing. This preliminary action ensures that the image refresh is properly coordinated with the line scan cycle before actual image display occurs, preventing display artifacts while maintaining energy efficiency
2Measurement precision
If LEDs are arranged in high-density matrix configuration, then display resolution is improved, but hardware design complexity and layout difficulty increase
Solution Approach 1:
The LED array is segmented into multiple scan lines that are driven sequentially rather than simultaneously. This segmentation approach allows high-density LED arrangements to be managed through time-division multiplexing, where each scan line is activated in sequence during a frame cycle, reducing the complexity of simultaneous control while maintaining high display resolution
Solution Approach 2:
The system employs periodic line scan action where each scan line is activated in sequential periods during a frame cycle. This periodic activation pattern simplifies the control architecture by using repetitive timing sequences rather than complex individual control for each LED, enabling high-resolution displays with manageable hardware design
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
Prevents image tearing or interruption by ensuring synchronized image refreshment with the line scan, improving display quality and reducing power consumption while simplifying hardware design and layout, thus enabling high-resolution and high-density LED arrangements.
Implementation Method 1
a light emitting diode (LED) array, a display module and a driving device. The LED array serves as a backlight module
Data Source
AI summary
A scan-type display apparatus includes an LED array, a display module, a control module and a driver module. The LED array has a common cathode configuration. The control module generates a synchronization control (SC) signal. Based on the SC signal, the driver module outputs an input voltage to scan lines of the LED array sequentially without overlapping in time so as to drive LEDs of the LED array to emit light in a line scan manner, and generates an image refresh signal that is related to the output of the input voltage to one of the scan lines which corresponds to a last line of the line scan in each line scan cycle and that is further related to refreshing of images on a display constituted by the LED array and the display module.