led、led顯示屏的發(fā)展歷史、發(fā)展意義及前景畢業(yè)論文(已修改)
2025-05-31 13:07 本頁面
【正文】 安徽蚌埠機電技師學(xué)院應(yīng)用電子 技術(shù)專業(yè) 畢業(yè)論文 第 1 頁 共 12 頁 目 錄 摘要 ??????????????????????????? 2 1 LED概述 ?????? ??? .??????????????? 3 LED發(fā)展歷史介紹 ??? ????? ??? ?????? 4 LED 的發(fā)展前景 ????? .????????? 5 2 LED 顯示屏概述 ????????????????????? 6 LED 顯示屏發(fā)展經(jīng)歷了三個階 ??? ???????? 7 我國 LED 顯示屏發(fā)展現(xiàn)狀 ????????????? 9 3結(jié)束語 ????? ???????????????????? 11 致謝 ?????????????????????????? 12 參考文獻 ??????????????? ???????? 12 安徽蚌埠機電技師學(xué)院應(yīng)用電子 技術(shù)專業(yè) 畢業(yè)論文 第 2 頁 共 12 頁 LED、 LED 顯示 屏 的發(fā)展歷史 、 發(fā)展意義及前景 摘要 發(fā)光二極管（英語： LightEmitting Diode，簡稱 LED） 是一種能發(fā)光的半導(dǎo)體電子元件。這種電子元件早在 1962 年出現(xiàn)，早期只能發(fā)出低光度的紅光，之后發(fā)展出其他單色光的版本，時至今日能發(fā)出的光已遍及可見光、紅外線及紫外線，光度也提高到相當?shù)墓舛?。而用途也由初時作為指 示燈、顯示板等；隨著技術(shù)的不斷進步，發(fā)光二極管已被廣泛的應(yīng)用于顯示器、電視機采光裝飾和照明。 LED 只能往一個方向?qū)ǎㄍ姡?，叫作正向偏置（正向偏壓），當電流流過時，電子與空穴在其內(nèi)復(fù)合而發(fā)出單色光，這叫電致發(fā)光效應(yīng)，而光線的波長、顏色跟其所采用的半導(dǎo)體材料種類與摻入的元素雜質(zhì)有關(guān)。具有效率高、壽命長、不易破損、開關(guān)速度高、高可靠性等傳統(tǒng)光源不及的優(yōu)點。白光 LED 的發(fā)光效率，在近幾捻來已經(jīng)有明顯的提升，同時，在每千流明的購入價格上，也因為投入 市場的廠商相互競爭的影響，而明顯下降。雖然越來越多人使用 LED 照明 作辦公室、家具、裝飾、招牌甚至路燈用途，但在技術(shù)上， LED 在光電轉(zhuǎn)換效率 (有效照度對用電量的比值 )上仍然低于新型的熒光燈，是國家以后發(fā)展民用的去向！ Light emitting diode (English: LightEmitting Diode, referred to as LED) is a kind of semiconductor electronic ponents capable of emitting light. This electronic ponent first appeared in 1962, early only a lowluminosity red, after developing other monochromatic version, to make today39。s light throughout the visible light, infrared and ultraviolet spectrophotometry, also be enhanced to a considerable spectrophotometry. But also at the beginning of time as indicator lights, display board。 with the progress of technology, the lightemitting diodes have been widely used in monitors, television lighting decoration and can only go in one direction conduction (electricity), a positive bias is called (forward bias), when the current flows, electron and hole in the posite and emit monochromatic light, this is called electroluminescence effect, and the wavelength of light, color and semiconductor materials with the incorporation of impurities in the using the. Has the advantages of high efficiency, long service life, not easy to be damaged, switch has the advantages of high reliability, high speed, less than the traditional light source. The luminous efficiency of white LED, in recent years there have been significantly improved, at the same time, in every thousand lumens of the purchase price, but also because of investment firms peting, dropped obviously. Al
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