Sample Lecture – First of All
Lazer Projector
江誠敏、陳奕慈、林郁翰、王志新
Principle of Lazer Projector
Video
Basic Principle
Control the lazer beam to "draw" images.
最基本的想法就是控置雷射光出去的位置、畫出圖形Structure
有三個地方要注意
- 雷射源
- Colour Control 如果要多色
- Scanning System 如果沒有只是雷射筆
中間只是效果器
Structure
Laser
因為要經過多次反射，需高能。另外要注意人對不同波長 反應不同。Galvo Motor
Motor with mirror to controller the deflection of laser beams.
Need 2 Galvo for a 2D image.
Galvo Motor
Galvo Motor
Galvo Motor
- Need to be fast and precise.
- Typically 10kpps.
- The faster the galvo, the smoother the projected image.
Track planning
Full pixel scanning
Full pixel scanning
Architecture
Architecture
Lazer Projector Module
Block Diagram
MEMS drive ASIC
- Uses feedback from sensors on the MEMS scanner to the system on resonance and at fixed scan amplitude.
- The image is drawn in both direction.
MEMS drive ASIC
- VPS engine effectively maps the input pixels onto a high resolution.
- Mapping from digital coding to laser drive is performed by the ALD.
MEMS Scanner
- Biaxial MEMS scanner
How to make smaller projector?
Make components smaller.
Fresnel lens
Fresnel lens
Smaller lazer diode
Promotion & Competitors
Features
- 攝相鏡頭偵測外部環境
- 根據接收影像調整不同區域亮度(非平面or單色投影幕時)
- 自動/手動調整整體亮度(室內光線存在時也能使用)
- 雷射光源:降低熱能產生
- 要有內建電源才有便攜之意義
- 能無線連結裝置
Sony MP-CL1 無線微型投影機(2015)
- 無線(Miracast 鏡射功能)連接電腦、手機
- HDMI/MHL
- 內建電池 2hr，可當行動電源
- 自動對焦(弧面亦可投影)
- 耳機孔輸出
benQ 純雷射節能投影機LX60ST(2012)
benQ 純雷射節能投影機LX60ST(2012)
- 商務及大型展演空間
- 光源: 20,000 小時(8hr/day, 5day/week: 約10年)
- 90% 省電模式
- 80,000:1 的超高對比
- 任意角度投影
Casio XJ-A140(2010)
- 雷射 & LED 混合(20000 小時)
- 8 秒開機時間
- 色域更廣
- 四種模式:標準、圖形、劇場、黑板
- 2 倍光學廣角鏡頭
- 畫面歪斜自動校正
Reference
Lazer Projector江誠敏、陳奕慈、林郁翰、王志新