Scan Display Synchronization with LED Line Scanning
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Solution Overview
Problem
Conventional scan-type display apparatuses experience image tearing or interruption when using a non-periodic synchronization control signal with a scanning backlight module, as the light emission is not synchronized with the image refresh, leading to suboptimal display performance.
Innovation Solution
A scan-type display apparatus with a light emitting module and a driving device that includes a control module generating switching signals and an image refresh signal to drive an LED array in a line scan manner, ensuring that the LEDs emit light sequentially without overlapping, synchronizing the image refresh with the line scan cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional driver module drives the display based on a non-periodic synchronization control signal with a scanning backlight module, then the display can operate with variable frame rates, but image tearing or interruption occurs because the light emission is not synchronized with the image refresh
Solution Approach 1:
The control module generates switching signals based on the synchronization control signal to control the scanning backlight module, and generates image refresh signals based on the switching signals to control the display module. This feedback mechanism ensures that the display module refreshes images only when the backlight is in a stable state, preventing image tearing while supporting variable frame rates
Solution Approach 2:
The control module generates switching signals before driving the scanning backlight module to emit light, and generates image refresh signals based on these switching signals before refreshing the display. This preliminary action ensures that the display is refreshed at the appropriate timing to avoid image tearing
2Use of energy by moving object
If a scanning backlight module emits light in a line scan manner triggered by a non-periodic synchronization control signal, then energy consumption is reduced, but image tearing or interruption occurs due to lack of synchronization with image refresh
Solution Approach 1:
The control module generates image refresh signals based on the switching signals that control the scanning backlight module. This feedback mechanism ensures that the display module refreshes images only when the backlight is in a stable state, preventing image tearing while maintaining energy efficiency
Solution Approach 2:
The control module generates switching signals before driving the scanning backlight module to emit light, and generates image refresh signals based on these switching signals before refreshing the display. This preliminary action ensures that the display is refreshed at the appropriate timing to avoid image tearing
3Device complexity
If the display module is driven without synchronization between image refresh and line scan, then device complexity is reduced, but image tearing or interruption occurs
Solution Approach 1:
The control module performs multiple functions: generating switching signals to control the scanning backlight module and generating image refresh signals based on these switching signals to control the display module. This multi-functionality achieves synchronization without requiring separate dedicated circuits
Solution Approach 2:
The switching signals act as an intermediary between the synchronization control signal and the image refresh signals. The control module uses these switching signals as a reference to generate properly timed image refresh signals, achieving synchronization without complex direct timing circuits
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 solution prevents image tearing and interruption by ensuring that the image refresh is synchronized with the line scan, resulting in improved display quality and compatibility with common anode LED arrays, simplifying the driver module design, and reducing heat concentration.
Implementation Method 1
The light emitting module serves as a backlight module, is to receive an input voltage, and includes a light emitting diode (LED) array
Data Source
AI summary
A scan-type display apparatus includes a light emitting module, a display module, a control module and a driver module. The light emitting module includes an LED array having a common anode configuration. The control module generates an image stream, a plurality of switching signals that cause the LED array to emit light in a line scan manner, and an image refresh signal that is related to refreshing of images on a display constituted by the light emitting module and the display module. The driver module generates a drive output to drive the display module, such that the display shows images represented by the image stream and that the refreshing of images on the display is synchronous to the line scan.