显示技术 1 2

(1)共轴棱镜(google glass)

(2)Bridbath(Rokit,RayNeo,ThinkReality,Xreal),一律共轴(光线传播是否按同一轴线传播)。

(3)自由曲面(Curved Mirror)

  • 自由曲面——棱镜——离轴棱镜(MIJIA,EPSON)。
  • 自由曲面——离轴反射——大曲面(Lenovo Mirage,Rhino X,Meta Glass,RealMax)。
  • 自由曲面——钻石——小曲面(ARKnow,Snapdragon x Goertek AR2)。
  • 直接投影到曲面上。结构灵活,眼镜厚度降低,透光率提升。

(4)光波导(waveguide) 3

  • 光机方案: 4 5 6
    • MicroLED。RGB集成困难,缩小尺寸困难。
    • MicroOLED。亮度受限。
    • LCos(Liquid crystal on silicon):亮度很高,但是功耗高,占用体积大,对比度低。
  • Diffractive waveguide 衍射光波导:
    • 衍射表面浮雕纳米柱:WaveOptics镜片生产,Spectacles by Snap。
    • 衍射表面浮雕倾斜光栅波导——B端:价格偏高,功耗高的方案。
      • Digilens,光学厂商制作眼镜。
      • HoloLens。
      • Vuzix,开展很多行业认证以入局B端。
      • Magic Leap70度FOV。
    • 衍射表面浮雕倾斜光栅波导——国内AR:(区分:玻璃/树脂,一维/二维)
      • INMO GO(52g)。使用MicroOLED,长续航:一维光波导,单绿色LED。无计算模块。
      • RayNeo X2
      • 魅族 MYVU(43.5g)。单色,无计算模块。
  • Geometric Waveguide 阵列(几何)光波导:
  • Holographic waveguide 全息光波导。
  • Reflective waveguide 反射光波导。

光机方案 5 4

Ideal see-through smart glasses must meet three criteria:

  1. the display light engine must be compact, around 1 inch or smaller.
  2. the display brightness specifications should reach at least 4,000 nits, and exceed 1 million nits for outdoor scenarios.
  3. the resolution must be at least 3,000 PPI.

  LCD (Liquid Crystal Display) LCOS (Liquid Crystal on Silicon) Micro-OLED (OrganicLight-Emitting Diode) Micro LED
Technology Principle Transmissive LCD
a liquid crystal display with LED (light-emitting diode) as the backlight source.
Reflective LCD
combines LCD and CMOS integrated circuits
Self-luminous
a single crystal silicon wafer (Wafer) as the backplane.
Self-luminous
LED chips with three luminous colors of RGB.
Pros Mature technology, low cost, high color gamut, long prolife Small size, low cost, high resolution, wide color gamut, high light utilization, Fast response, low power, richer color, ductility, wide operating temperature range, high integration, small size, easy to carry, high contrast High resolution, high brightness, high contrast, high color saturation and low power consumption, fast response time, thin thickness, long prolife.
Cons High power consumption, low contrast, low light utilization, large engine. Slow response time, high power consumption, low contrast, large engine. Low brightness, high cost, average lifespan, average luminous rate High cost, complex technology, difficult mass production, mostly monochrome
Usage     Apple’s Vision Pro, Xreal  

References