Naked-eye 3D Backlight Module Viewing Angle Expansion
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Solution Overview
Problem
Conventional naked-eye 3D display devices have limited viewing angles, restricting the range in which a three-dimensional image can be seen effectively.
Innovation Solution
A naked-eye 3D backlight module comprising a light emitting diode (LED) sequential circuit board with sets of LED units, convex lenses to converge light into parallel beams, polygonal prisms to refract these beams into multiple directions, and a thin film transistor liquid crystal display (TFT-LCD) to control transmission, combined with a multiple-viewing-angle parallax barrier to form an n-viewpoint area display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional parallax barrier is used with limited LED backlight sources, then the device structure remains simple, but the viewing angle range is limited
Solution Approach 1:
The backlight module is segmented into multiple independent LED units arranged in specific patterns, with each unit having its own convex lens and being controlled by corresponding pixel units. This segmentation enables different light beams to be directed toward different viewing angles, thereby expanding the overall viewing angle range without requiring a completely complex new structure
Solution Approach 2:
The invention introduces a new dimension of control by using polygonal prisms to refract light beams into multiple directional paths. This transforms the traditional single-direction light propagation into multi-directional light distribution, effectively expanding the viewing angle space without proportionally increasing structural complexity
2Adaptability or versatility
If multiple LED units with convex lenses and polygonal prisms are introduced to expand viewing angles, then the viewing angle range is enlarged, but the device structure becomes more complex
Solution Approach 1:
The polygonal prisms serve multiple functions: they refract light beams into multiple directions, work in conjunction with convex lenses to control light paths, and enable a single backlight module to serve multiple viewing angles simultaneously. This multi-functionality reduces the need for separate components for each function, thereby managing complexity while achieving expanded viewing angles
Solution Approach 2:
Convex lenses act as intermediaries between LED units and polygonal prisms, transforming divergent light from LEDs into parallel beams that can be efficiently refracted by the prisms. This intermediary component simplifies the overall optical path control and makes the system more manageable despite the increased number of elements
3Adaptability or versatility
If n parallel light beams are refracted into n directions to create n-viewpoint area display, then the viewing flexibility is improved, but the light transmission control becomes more difficult
Solution Approach 1:
The system uses sequential backlighting with LEDs turning on and off in periodic sequences, synchronized with the TFT-LCD refresh rate. This periodic action simplifies control by activating only the necessary LED units and corresponding pixel units at specific time intervals, making light transmission control more manageable despite multiple light paths
Solution Approach 2:
The TFT-LCD pixel units dynamically adjust their transmission states to control which light beams pass through to which viewing angles. This dynamic control, synchronized with the sequential LED activation, enables flexible viewing angle management without requiring complex static optical paths
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
The solution significantly enlarges the three-dimensional viewing angle, allowing a three-dimensional picture to be seen in multiple areas, enhancing the usability and effectiveness of the display device.
Implementation Method 1
each of the convex lenses is configured to converge a light beam emitted from a corresponding LED unit of the LED units into a parallel light beam
Implementation Method 2
each of the plurality of polygonal prisms has n refracting sides and is configured to refract the parallel light beams oriented in the same direction after passing through the convex lenses into n parallel light beams respectively oriented in n directions
Data Source
AI summary
Disclosed are a naked-eye 3D backlight module, a naked-eye 3D display device, and a naked-eye 3D display method. The naked-eye 3D display device comprises: a light emitting diode (LED) sequential circuit board comprising a plurality of sets of LED backlight sources; a plurality of convex lenses provided in one-to-one correspondence with the LED units; a plurality of polygonal prisms provided in one-to-one correspondence with the LED backlight sources; a thin film transistor liquid crystal display (TFT-LCD) having a refresh frequency the same as a sequential frequency of the LED backlight sources and configured to control transmissions of the n parallel light beams; and a multiple-viewing-angle parallax barrier configured to form the n parallel light beams, which are respectively oriented in the n directions after passing through the TFT-LCD, into an n-viewpoint area display in space. A three-dimensional (3D) viewing angle for the human eyes is greatly enlarged.