Audible Noise Reduction for LCD Module of Mobile Display
| Autor: | Hung-Ming Kao, 高弘明 |
|---|---|
| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 Now in this society, mobile phone is popular using of communication tool. During communication, clear acoustic fidelity is necessary. However, there are many factors to affect acoustic fidelity in mobile phone. One of factor was from LCD display module. LCD display module is very important parts on mobile phone. It can let user know all information through display screen. Due to module structure and assemble issue, LCD panel vibration will be caused by difference driving method. When the frequency of vibration is continually and frequency is during from 20 Hz to 20 KHz, we can call it is an audible noise and it will be heard by human ear. Communication quality will be lower if audible noise is getting more. How to reduce the audible noise will be discussed in this thesis. This thesis is discussing about the relationship between panel noise and LCD driver IC. I measured and compared test data by using difference driving method. Base on those data, a better driving method is proposed. All test are used FPGA evolution board or MCU controller board to write test program, or adopt external hardware circuit for testing, and then measure all data in anechoic room in three party. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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