Single photon flash light detection and ranging (LiDAR), which is based on Geiger Mode avalanche photodiode (GMAPD) array, enables superior sensitivity and detection range to obtaining depth information. The Flash LiDAR captures an entire 3D image by single laser pulse, much faster than conventional LiDAR based on the scanning of a single detector over the scene. In conventional advanced driver assistant systems (ADAS), closer and weaker reflections caused by the environmental factors will cause misidentification. Furthermore, power dissipation and limited pixel size are enormous challenges for Readout Integrated Circuit (ROIC) design. The paper proposes the design of ROIC with Multi-Echo Detection for 128×32 GM-APD Array. The pixel includes active quenching and reset circuit of GM-APD, and embedded 11-bit Time to Digital Converter (TDC) offers precise distance resolution by Time of Flight (TOF) measurement. The proposed ROIC is designed with 0.18μm CMOS process. Due to shared DFFs by TDC and shift register, 90μm pixel pitch is realized with Multi-Echo Detection function. Global clock gating(GCG) and shift clock gating(SCG) techniques bring the power dissipation down to 464.6mW.
The requirements for ITO glass used in OLED are higher than those for LCD used. It has to keep much strict control on the process for making ITO glass because of the numerous impact factors. An orthogonal analysis method is used to deal with those factors, and the ITO glass good enough for OLED used by the DC magnetron sputtering has been got. The glass properties are 17Ω/, 81% transmittance in visible region. By the orthogonal analysis method, we just use limited materials and take experiment times to finish the crafts research.
A novel 5-in. R.G.B densely packed poly-crystal MgAl2O4 (magnesium-aluminum-oxide) phosphor screens with multi-layer interface filter have been developed. The filter is a multi-layer alternate high and low index of refraction film which was fabricated by depositing high index of refraction of titanium oxide and low index of refraction of silicon oxide. The 5-in.R.G. B densely packed poly-crystal phosphor screens with the filter have 60% more luminance than those of common R.G. B poly-crystal phosphor screens, and the area of their chromaticity is almost 10% larger than that of common poly-crystal phosphor screen. The 5-in.R.G. B densely packed poly-crystal phosphor screens with multi-layer interface filter are fabricated by using a centrifugal sedimentation method. The resolution of densely packed poly-crystal phosphor screen with multi-layer interface filter is higher than that of conventional poly-crystal phosphor screen. An experimental 52-inch TV set adopting the set of 5-inch densely packed poly-crystal projection CRT with multi-layer interface filter has very high resolution of 2000 TV lines and 1800 cd/m2 luminance, and it is easy to realize the HDTV display.
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