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LC-TVs suffer from blurringand color separation of images when expressing moving objects. These artifacts can be reduced byhigh speed and precise on-off control of light which can be performed by LEDs without difficulty.To reduce power consumption, local dimming operation as well as independent luminance controlof red, green, and blue LEDs are required. This can never be realized with white CCFLs.Eleven-bit gray levels can be expressed with a precise control of LEDs at low luminance levels.This allows to design arbitrary gamma characteristics of displayed images, and also to enhancecontrast. LEDs’ narrow emission spectra yield wider color gamut compared to other technologies.Another important feature of LEDs is that they do not contain mercury, unlike CCFLs, andtherefore there is no environmental concern. One of the negative features is high cost. The cost ofa CCFL is typically 7 yens per lumen. That of LED, however, is about 20 times higher. 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液晶テレビ用LEDバックライトの現状と将来動向
https://uec.repo.nii.ac.jp/records/6913
https://uec.repo.nii.ac.jp/records/6913c7b1786f-58da-4bc4-b145-5768cb1b4ba9
名前 / ファイル | ライセンス | アクション |
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9000000086.pdf (971.2 kB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2010-02-08 | |||||
タイトル | ||||||
言語 | ja | |||||
タイトル | 液晶テレビ用LEDバックライトの現状と将来動向 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Present and Future of LED Backlights for LC-TVs | |||||
言語 | ||||||
言語 | jpn | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
著者 |
御子柴, 茂生
× 御子柴, 茂生 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Among various backlights for liquid cr ystal televisions (LC-TVs) including cold cathodefluorescent lamps (CCFLs) and organic electroluminescent lamps, light emitting diodes (LEDs)have features that cannot be attained by other backlight technologies. LC-TVs suffer from blurringand color separation of images when expressing moving objects. These artifacts can be reduced byhigh speed and precise on-off control of light which can be performed by LEDs without difficulty.To reduce power consumption, local dimming operation as well as independent luminance controlof red, green, and blue LEDs are required. This can never be realized with white CCFLs.Eleven-bit gray levels can be expressed with a precise control of LEDs at low luminance levels.This allows to design arbitrary gamma characteristics of displayed images, and also to enhancecontrast. LEDs’ narrow emission spectra yield wider color gamut compared to other technologies.Another important feature of LEDs is that they do not contain mercury, unlike CCFLs, andtherefore there is no environmental concern. One of the negative features is high cost. The cost ofa CCFL is typically 7 yens per lumen. That of LED, however, is about 20 times higher. Also about2,000 LEDs have to be arranged at the back of an LC panel having a 40-inch-diagonal screen,whereas only 20 lamps are necessary for CCFLs. A keyword to the future backlight would be “anintelligent backlight.” The backlight is no more a simple light source, but it is controlled by TVsignal for achieving better picture quality and lower power consumption. | |||||
書誌情報 |
ja : 電気通信大学紀要 巻 21, 号 1-2, p. 27-32, 発行日 2009-01-15 |
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出版者 | ||||||
出版者 | 電気通信大学 | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0915-0935 | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 |