Laser Projection Brightness Control With Dynamic Current Signals
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Solution Overview
Problem
Current laser projection apparatuses are limited by fixed brightness of the laser source, resulting in a poor display effect.
Innovation Solution
A laser projection apparatus with a display control circuit that generates variable brightness by producing N current control signals and M enable signals, allowing the laser source to emit light with adjustable brightness through a laser source driving circuit and a light modulation device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the laser source uses fixed brightness, then the structure is simple, but the display effect is poor
Solution Approach 1:
The patent implements dynamic brightness adjustment by controlling the laser source with variable current signals. The display control circuit generates multiple current control signals (N signals where N>2) that can dynamically adjust the laser source brightness according to different display requirements, transforming the fixed brightness system into a dynamic adjustable one.
Solution Approach 2:
The patent changes the current parameter supplied to the laser source to achieve brightness adjustment. By varying the current control signals and enable signals (M signals corresponding to M primary colors), the system can adjust the laser source output brightness across different levels, implementing dynamic dimming and variable brightness display effects.
2Illumination intensity
If the laser source brightness is adjustable, then the display effect is enhanced, but the control complexity increases
Solution Approach 1:
The patent segments the brightness control into multiple independent current control signals (N signals) and color channel enable signals (M signals). Each signal can be independently controlled and selected, allowing granular adjustment of laser source brightness for different primary colors and display frames, thereby managing control complexity through modular signal segmentation.
Solution Approach 2:
The display control circuit dynamically selects appropriate current control signals from N available signals based on display requirements. This dynamic selection mechanism allows the system to adapt brightness levels in real-time without requiring complex permanent circuitry for all possible brightness combinations, reducing overall control complexity.
3Measurement precision
If multiple current control signals are generated, then the brightness adjustment precision is improved, but the signal processing complexity increases
Solution Approach 1:
The patent generates N current control signals where N>2, providing more control signals than the minimum required. This excessive action allows for finer brightness adjustment precision by selecting from a larger pool of current levels, while the system only activates the necessary subset of signals for each display frame, managing processing complexity through selective usage.
Solution Approach 2:
The display control circuit pre-generates multiple current control signals in advance, preparing a library of brightness adjustment options before actual display operation. This preliminary action allows the system to have precise brightness control capabilities ready, while the actual signal processing complexity is reduced by selecting from pre-computed options rather than calculating in real-time.
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 apparatus achieves dynamic dimming and variable brightness, enhancing the display effect by supporting a laser source with adjustable lighting currents.
Implementation Method 1
The laser source is configured to emit laser light of at least one color
Implementation Method 2
The light modulation device is configured to modulate beams emitted by the laser source according to the image display data to generate image beams
Data Source
AI summary
A laser projection apparatus includes a display control circuit, a laser source, a laser source driving circuit, and a light modulation device. The display control circuit includes an algorithm processor and a control processor. The algorithm processor is configured to: determine a gain value α of each frame of image according to a gray scale value of each frame of image, and transmit N current control signals, M enable signals, and image display data to the control processor. The control processor is configured to: transmit the N current control signals and the M enable signals to the laser source driving circuit; and transmit the image display data to the light modulation device. The light modulation device is configured to modulate beams emitted by the laser source according to the image display data to generate image beams.