Laser Projection Phase Modulation for HDR Luminance Control
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Solution Overview
Problem
Laser projection apparatuses face limitations in achieving local backlight adjustment and high-dynamic range (HDR) display by adjusting luminance of lamp beads, leading to low luminous efficacy and poor practicality.
Innovation Solution
Incorporating a single phase light modulation device to perform phase modulation on laser beams, allowing for synchronization with display timing and increasing peak luminance while reducing dark field luminance, thereby enhancing luminous efficacy and achieving HDR display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional lamp bead adjustment method is used for local backlight adjustment, then display flexibility is improved, but luminous efficacy deteriorates due to low practicality
Solution Approach 1:
The patent replaces the mechanical lamp bead adjustment system with an optical phase modulation system. The phase light modulation device uses optical interference and diffraction to achieve local backlight adjustment without physically moving or adjusting lamp beads, thereby maintaining display flexibility while eliminating the energy loss associated with mechanical adjustment limitations.
Solution Approach 2:
The patent changes the control parameter from physical lamp bead position to optical phase parameters. By modulating the phase of laser beams through the phase light modulation device, the system achieves local backlight adjustment by changing optical parameters rather than mechanical parameters, improving both adaptability and luminous efficacy.
2Illumination intensity
If phase light modulation is applied to increase peak luminance, then HDR display capability is improved, but system complexity increases
Solution Approach 1:
The phase light modulation device serves multiple functions simultaneously: it performs phase modulation to increase peak luminance, enables local backlight adjustment, and achieves HDR display capability. This multi-functionality reduces the need for separate components, thereby managing system complexity while achieving high peak luminance.
Solution Approach 2:
The patent introduces a phase light modulation device as an intermediary between the laser source and the display medium. This intermediary component enables precise control of light phase and intensity, achieving HDR display and high peak luminance without requiring complex direct manipulation of the laser source or display medium themselves.
3Loss of energy
If laser beams are used as light source, then energy conservation is improved, but ability to achieve local backlight adjustment deteriorates
Solution Approach 1:
The patent replaces mechanical lamp bead adjustment with optical phase modulation to enable local backlight adjustment with laser beams. The phase light modulation device uses optical interference patterns to create localized brightness variations, maintaining energy conservation while achieving the adaptability needed for local backlight control.
Solution Approach 2:
The phase light modulation device utilizes periodic optical interference patterns to achieve local backlight adjustment. By creating periodic phase variations in the laser beams, the system can selectively enhance or suppress light in different regions, enabling local backlight control while maintaining the energy efficiency of laser sources.
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 enables high-dynamic range display with improved luminous efficacy by redistributing light energy in space, increasing peak luminance and reducing dark field luminance.
Implementation Method 1
the phase light modulation assembly is configured to perform phase modulation according to the phase video signal and the synchronization signal, so as to output first modulated beams to the first light modulation device
Data Source
AI summary
A laser projection apparatus and an image display method of the laser projection apparatus are provided. The laser projection apparatus includes a main control chip, a display driving assembly, a laser source assembly, a laser driving assembly, a video processing assembly, a phase light modulation assembly, and a first light modulation device. The display driving assembly is configured to send a synchronization signal to the phase light modulation assembly and a first driving signal to the first light modulation device according to a video signal. The laser driving assembly is configured to send a second driving signal to the laser source assembly. The video processing assembly is configured to send a phase video signal to the phase light modulation assembly according to the video signal. The phase light modulation assembly is configured to perform phase modulation according to the phase video signal and the synchronization signal.