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研究生:陳鵬宇
研究生(外文):Peng-Yu Chen
論文名稱:使用直方圖分析且以內容為基礎降低顯示器背光功率及影像對比增強之研究
論文名稱(外文):Content-Based LED Backlight Power Reduction with Image Contrast Enhancement Using Histogram Analysis
指導教授:賴永康
指導教授(外文):Yeong-Kang Lai
學位類別:碩士
校院名稱:國立中興大學
系所名稱:電機工程學系所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
畢業學年度:97
語文別:英文
論文頁數:77
中文關鍵詞:背光控制影像增強省電
外文關鍵詞:Backlight DimmingPower SavingImage Enhancement.
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本研究利用高整合性的FPGA系統結合New Backlight Dimming Algorithm 及New Image Enhancement Algorithm 二模組,實現可攜式電子裝置 TFT LCD 背光控制系統。其主要透過對影像分析,取得影像中間值及平均值來做為選擇背光電流的依據,以達到影像越亮則選擇背光電流越大,影像越暗則選擇背光電流越小的概念。當電流調降後並適當對影像做出補償,讓使用者感覺不出系統有任何變化,以達到電池最大操作週期,並由實驗結果得知,我們所提出演算法省電的比率可勝過前人所提出的方法。
The present research combines the highly-integrated FPGA system with two modules for the New Backlight Dimming Algorithm and New Image Enhancement Algorithm to realize the TFT LCD backlight control system of portable electronic devices. Therefore image analysis is performed to obtain the median value and mean value of the image, and thus determine the basis for amount of current for driving the backlight. The brighter the image is displayed the higher the selected backlight current is; and the darker the image is displayed the lower the selected backlight current is. After the amount of current is adjusted, the appropriate compensation is introduced to the image that will be indiscernible from the user’s standpoint and achieve the maximum battery operation cycle. From the experimental results, the power saving rate from our proposed algorithm is superior to the previous methods.
Contents
摘 要 i
Abstract ii
Contents iii
List of Figures vi
List of Tables viii
Chapter 1 Introduction 1
Chapter 2 Background 5
2.1 Liquid Crystal 5
2.1.1 TFT-LCD Structure 6
2.1.2 Liquid Crystal Electro-Optical Effect 7
2.1.3 TFT Pixel Element 7
2.1.4 Liquid Crystal Applications in Display Panels 9
2.1.4.1 TN-LCD 9
2.1.4.2 STN-LCD 9
2.1.4.3 TFT-LCD 9
2.1.5 Transflective 10
2.1.6 Backlight Module 11
2.1.6.1 Types of Backlight Modules 11
2.1.6.1.1 Side Backlight Module 11
2.1.6.1.2 Vertical Backlight Module 12
2.1.6.1.3 Hollow Backlight Module 13
2.1.6.2 Backlight Module 13
2.1.6.2.1 Light Source 13
2.1.6.2.2 Light Guide Plate 13
2.1.6.2.3 Reflector 13
2.1.6.2.4 Diffuser 14
2.1.6.2.5 Brightness Enhancement Film 14
2.1.6.2.6 Polarization Conversion Film 14
2.1.6.3 Principle of the LCD Display 15
2.1.6.4 The Complete LCD Panel 16
2.1.6.5 LCD Panel Mechanical Structure 16
2.2 Glossary 17
2.2.1 Histogram 17
2.2.2 Image Histogram 17
2.2.3 Mean Value 18
2.2.4 Median Value 18
2.2.5 PSNR (Peak Signal to Noise Ratio) 19
2.2.5 HSV (Hue Saturation Value Color space) 20
CHAPTER 3 LCD Backlight Dimming System 21
3.1 LCD Backlight Dimming Algorithm 21
3.1.1 Previous Works for Backlight Dimming 21
3.1.1.1 Backlight Power Reduction and Image Contrast Enhancement Using Adaptive Dimming for Global Backlight Applications 21
3.1.1.2 A Backlight Optimization Scheme for Video Playback on Mobile Devices 22
3.1.2 Our Proposed New Backlight Dimming Algorithm 23
3.2 LCD Image Enhancement Algorithm 25
3.2.1 Previous Works for Image Enhancement 25
3.2.1.1 Image Quality Enhancement for Low Backlight TFT–LCD Displays 25
3.2.1.2 A Backlight Optimization Scheme for Video Playback on Mobile Devices 26
3.2.1.3 Backlight Power Reduction and Image Contrast Enhancement Using Adaptive Dimming for Global Backlight Applications 27
3.2.1.4 Power Minimization in a Backlit TFT-LCD Display by Concurrent Brightness and Contrast Scaling 27
3.2.1.5 Dynamic Backlight Luminance Scaling of Liquid Crystal Display 28
3.2.2 Our Propose New Image Enhancement Algorithm 29
CHAPTER 4 FPGA Implementation 32
4.1 Demo Platform 32
4.1.1 Altera DE2 - Development and Education Board 32
4.1.2 256K x 16 ASYNCHRONOUS STATIC RAM 34
4.1.2.1 Pin Descriptions 34
4.1.2.2 Truth Table 34
4.1.2.3 Write Cycle 35
4.1.2.4 Read Cycle 35
4.1.3 32 Megabit Flash Memory 36
4.1.3.1 Logic Symbol 36
4.1.3.2 Pin Descriptions 36
4.1.3.3 BYTE# Timings for Read Operations 37
4.1.4 TFT LCD Module 37
4.2 FPGA Design Module Introduction 38
4.2.1 7 Segment Display Module 38
4.2.2 Reset Delay Module 39
4.2.3 PLL Module 40
4.2.4 TFT LCD 3 Wire Module 40
4.2.5 Flash Controller Module 41
4.2.6 SRAM Controller Module 42
4.2.7 KEY Controller Module 43
4.2.8 HOST Controller Module 43
4.2.9 SYSTEM BLOCK DIAGRAM 45
4.3 Implementation and Performance Analysis 46
4.3.1 Implementation Analysis 46
4.3.2 Implementation Result 49
4.3.2.1 Test case 1 Analysis 49
4.3.2.2 Test case 2 Analysis 53
4.3.2.3 Test case 3 Analysis 57
4.3.2.4 Test case 4 Analysis 61
4.3.2.5 Test case 5 Analysis 65
4.3.2.6 Test case 6 Analysis 69
4.3.3 Performance Analysis 73
CHAPTER 5 Conclusion 75
Bibliography 76
[1].液晶顯示器驅動電路介紹 盧志文 國立暨南國際大學電機系助理教授
[2].http://www.auo.com.
[3].http://www.or.com.tw/mz/down_mz_2/down_mz_2-b-27.htm
[4].http://tw.myblog.yahoo.com/jw!raiTBxqfGRRgO52kKmk-/article?mid=140&prev=143&l=f&fid=14
[5].http://en.wikipedia.org/wiki/Peak_signal-to-noise_ratio
[6].http://zh.wikipedia.org/w/index.php?title=Special%3A%E6%90%9C%E7%B4%A2&search=Histogram&go=%E9%80%B2%E5%85%A5
[7].http://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&No=30
[8].Chi-Chang Lai and Ching-Chih Tsai, “Backlight Power Reduction and Image Contrast Enhancement Using Adaptive Dimming for Global Backlight Applications,” accepted for publication in IEEE Transactions on Consumer Electronics, vol.54, no.2, May 2008.
[9].Liang Cheng; Mohapatra, S.; Zarki, M.E.; Dutt, N.; Venkatasubramanian, N., “A backlight optimization scheme for video playback on mobile devices,” accepted for publication in IEEE Transactions on Consumer Communications and Networking Conference, 2006. CCNC 2006. 3rd IEEE, vol.2, no.8-10, Jan 2006.
[10].Naehyuck Chang, Inseok Choi, and Hojun Shim, “DLS: Dynamic Backlight Luminance Scaling of Liquid Crystal Display, ” accepted for publication in IEEE Transactions on Very Large Scale Integration (VLSI) Systems, vol.12, no.8, Aug 2004.
[11].W.-C. Cheng, Y. Hou, and M. Pedram, “Power minimization in a backlit TFT-LCD display by concurrent brightness and contrast scaling,” in Proc. Conf. Design, Automation and Test in Europe, pp. 10252-10259, Feb. 2004.
[12].Pei-Shan Tsai Chia-Kai Liang Chen, H.H. , “Image Quality Enhancement for Low Backlight TFT-LCD Displays,” Image Processing, 2007. ICIP 2007. IEEE International Conference on vol.3, Oct 2007.
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