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URN etd-0816110-160900 Statistics This thesis had been viewed 2143 times. Download 1005 times. Author Min-Yu Huang Author's Email Address No Public. Department Communication Engineering Year 2009 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 64 Title A Color Display Device Based on Circular Scanning of Linear LED Arrays Keyword linear LED arrays Rotary Scanning Bilinear interpolation Pulse-width modulation (PWM) vision hysteresis vision hysteresis Pulse-width modulation (PWM) Bilinear interpolation Rotary Scanning linear LED arrays Abstract Common large size LED display in the outdoor display panel. LEDs is uniformly distributed in the display plane, and to complete the overall image of the display. However, to improved the display area and resolution, LEDs a large number of necessary. Causing increased power consumption and occupy much space.
To proposed slued the rotational scan of an LED array to form the rectangular image based on principles of vision hysteresis. Synchronous to control on for LED array in the spatio-temporal, achieve large size LED display similar to the images generated.
Must coordinate transformation operator for image data. To quantify the parameters of Polar coordinates into integer value produce non-integer value when the conversion to Cartesian coordinates. Therefore, using Bilinear interpolation method for image data re-sampling. Using Pulse Width Modulation(PWM) control pulse number to achieve the gray value. In order to obtain stable images, the process of reading data to avoided mistakes, so the motor must be maintained periodically and steady the rotational speed.
The method and the purpose of this thesis achieve a great effect. To use less number of LED can also have full color display. In order to achieve three-dimensional display system, improve the calculation method on the re-sampling algorithm. Obtain more number of gray scales for the full color LED display system.
Advisor Committee Chun-Hsien Chou - advisor
Files Date of Defense 2010-07-27 Date of Submission 2010-09-06