基于PXA270处理器和WinCE操作系统,根据显示屏的时序特性,设计实现18bit/pixel,象素位深)存储模式下的LCD显示驱动。重点介绍了在帧缓冲区中采用18bit/pixel Packed(Bit Per Pixel_Packed,压缩象素位深)方式存储象素的处理方法,以及LCD...基于PXA270处理器和WinCE操作系统,根据显示屏的时序特性,设计实现18bit/pixel,象素位深)存储模式下的LCD显示驱动。重点介绍了在帧缓冲区中采用18bit/pixel Packed(Bit Per Pixel_Packed,压缩象素位深)方式存储象素的处理方法,以及LCD控制器、屏接口硬件设计和显示驱动底层流程。实验表明,采用18bit/pixelP acked的存储方式画质显示更为鲜明,视频文件播放更加流畅,采用BMQ软件测试系统总分达到745分。展开更多
The contact angle is one of important parameters to simulate droplet spreading and impingement phenomena on the surface. In the most numerical research, it is assumed constant value and it is implemented as boundary c...The contact angle is one of important parameters to simulate droplet spreading and impingement phenomena on the surface. In the most numerical research, it is assumed constant value and it is implemented as boundary condition. However, contact angle is changed according to contact line velocity and time. Hence, for accurate simulation, dynamic contact angle which has various values as time elapsed is adopted. In the present study, the numerical analysis is performed on the droplet spreading phenomena considering dynamic contact angle function which is obtained from single droplet spreading experiment on the flat and bare surface. The CIP （cubic interpolated pseudo-particle） method by Yabe is used for analysis of interface between liquid and gas phases. The numerical results considering contact angle function which newly modeled as time and contact angle are compared with numerical results considering Hoffman＇s function and experimental data for range of Weber number which are 4.427 and 11.334. In contrast of numerical result considering Hoffman＇s function, the numerical result shows good agreement with experimental data as time elapsed in contact angle evolution, deformation of droplet spreading radius and height. Indeed, overall, the results display the increasing maximum spreading radius and the decreasing height as Weber numbers increased.展开更多
文摘基于PXA270处理器和WinCE操作系统,根据显示屏的时序特性,设计实现18bit/pixel,象素位深)存储模式下的LCD显示驱动。重点介绍了在帧缓冲区中采用18bit/pixel Packed(Bit Per Pixel_Packed,压缩象素位深)方式存储象素的处理方法,以及LCD控制器、屏接口硬件设计和显示驱动底层流程。实验表明,采用18bit/pixelP acked的存储方式画质显示更为鲜明,视频文件播放更加流畅,采用BMQ软件测试系统总分达到745分。
文摘The contact angle is one of important parameters to simulate droplet spreading and impingement phenomena on the surface. In the most numerical research, it is assumed constant value and it is implemented as boundary condition. However, contact angle is changed according to contact line velocity and time. Hence, for accurate simulation, dynamic contact angle which has various values as time elapsed is adopted. In the present study, the numerical analysis is performed on the droplet spreading phenomena considering dynamic contact angle function which is obtained from single droplet spreading experiment on the flat and bare surface. The CIP （cubic interpolated pseudo-particle） method by Yabe is used for analysis of interface between liquid and gas phases. The numerical results considering contact angle function which newly modeled as time and contact angle are compared with numerical results considering Hoffman＇s function and experimental data for range of Weber number which are 4.427 and 11.334. In contrast of numerical result considering Hoffman＇s function, the numerical result shows good agreement with experimental data as time elapsed in contact angle evolution, deformation of droplet spreading radius and height. Indeed, overall, the results display the increasing maximum spreading radius and the decreasing height as Weber numbers increased.
