Backlight Controller Merging Driving Circuits for VR Displays
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Solution Overview
Problem
Traditional LCD modules are disadvantaged in terms of working stability and brightness, especially in close-range AR/VR displays, where high instantaneous brightness is required, leading to increased costs and power consumption due to the need for multiple LED driving ICs in direct-lit backlights.
Innovation Solution
A driving device for a backlight module divided into multiple light-emitting areas with point sources, utilizing a controller and overvoltage protection circuits to output a time-series voltage signal, allowing each area to emit light at different periods, reducing the number of driving circuits and PCB area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If direct-lit backlight is used to improve LED operating current and brightness, then brightness is improved, but device complexity and cost increase due to multiple LED driving ICs
Solution Approach 1:
The patent merges multiple driving circuits into a single driving circuit that controls all light-emitting areas. The controller integrates the functions of multiple LED driving ICs, reducing device complexity while maintaining the ability to drive all point sources in different light-emitting areas.
Solution Approach 2:
The single driving circuit is designed with multi-functionality to control multiple light-emitting areas with different voltage requirements. It can output different voltage signals to different areas, replacing multiple specialized driving ICs with one universal controller.
2Illumination intensity
If multiple LED driving ICs are used to achieve high instantaneous brightness, then brightness is improved, but PCB area increases
Solution Approach 1:
Multiple LED driving ICs are merged into a single integrated controller on the PCB, significantly reducing the total PCB area occupied by driving circuits while maintaining the capability to drive all light-emitting areas for high instantaneous brightness.
3Quantity of substance
If traditional LCD module is used, then cost is reduced, but working stability and brightness are insufficient
Solution Approach 1:
The patent uses overvoltage protection circuits with different preset voltage ranges to control different light-emitting areas. By changing voltage parameters dynamically, the system achieves better working stability and brightness performance while maintaining cost-effectiveness through a simplified driving circuit design.
4Adaptability or versatility
If overvoltage protection circuits with overlapping voltage ranges are used, then control flexibility is improved, but reliability decreases due to voltage conflicts
Solution Approach 1:
The patent sets non-overlapping preset voltage ranges for different overvoltage protection circuits, where each circuit has a unique voltage range. This parameter configuration ensures reliable voltage signal control without conflicts while maintaining flexibility in controlling different light-emitting areas.
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 enhances brightness and stability while reducing the number of driving circuits and PCB area, making it suitable for small-sized products like VR displays without increasing costs.
Implementation Method 1
the other end of the Zener diode is connected to ground; the clamp voltages of the Zener diodes of the overvoltage protection circuits corresponding to the respective light-emitting areas are different from each other
Data Source
AI summary
A method for driving a backlight module, a driving device and a display apparatus are provided. The backlight module is divided into a plurality of light-emitting areas, each of the light-emitting areas including a plurality of lines of point sources, and the driving device includes a controller and a driving component, the driving component is connected to the controller and is configured to output a time series of voltage signal to the controller, and the controller is connected to all the plurality of lines of point sources in each of the light-emitting areas and is configured to drive the lines of point sources in the light-emitting area to emit light respectively at different periods based on the time series of voltage signal.