LED display LED screen LED billboards LED signs LED panel: 12/27/13

Friday, December 27, 2013

LED显示屏对比度

如何计算LED显示屏中的对比度指标

了解了户外led显示屏的设计及其如何对对比度构成影响，对深入了解那些会影响该类产品对比度测试的变数有较大帮助。如前所述，户外大尺寸led视频显示屏的对比度极大地依赖于之前所描述过的模组的构造方法，即包括：百叶窗的设计、织构化（texturing）、涂层以及led密度。为了使对比度测试有实际意义并有可重复性，很有必要准备一个完全黑暗的暗室用以排除外界光线的干扰。

在对比度测试中，led模组、测试仪器和光源是相互作用的三个关键因素。大多数led显示屏制造商只会做一个基本的开-关（on-off）测试流程，其关态对应即是视频黑场（videoblack）。而在全行业范围内却没有形成统一的测试技术标准，虽然对某些显示屏技术存在着一些测量对比度的法定标准，例如VESAFPDM（视频电子标准协会平板显示屏测试），但是这对led行业却并不完全适用。和平板显示器测量不同，环境光源（太阳）和测量工具（观看者）每一天每一刻都在改变，而驾车或步行的行人每分钟也都在变化，这一点很难在测试中予以重复，也很难在一本产品说明书里解释得清楚。还有一点需要注意的是，在测试条件下，相对于较大尺寸的完整led显示屏来说，实际只能对单个的模组或是一些模组的集合来进行测试。

在实测环境内，环境光是用人造光源来再现真实大光源相对于led(www.aswei.cn)的角度就可以在模组表面创造出更大的阴影面积，从而最终可以改良显示屏的黑场状态。

led显示屏

对比度是led显示屏的重要指标，提高对比度最主要的方法；

一是提高显示屏的亮度，

二是降低显示屏幕表面的光反射系数。计算方法：对比度＝发光时的亮度（发光亮度）/不发光时的亮度（反射亮度）为了能够显示出亮度均一的文字和图像，不受周围光线的影响，屏幕应具有足够的对比度。

不发光时的亮度与环境光照、屏幕反射系数成正比，而对比度则成反比，对比度越高，屏幕显得越亮，我们深切地认识到对比度对人眼的影响，所以我们在提高屏幕亮度的同时，尽量降低屏幕表面的光反射系数，屏幕表面材料的光反射系数控制得越低，在屏幕最高发光强度不变的情况下,即可保证有较高的对比度。

对于表面光反射系数的控制，我们采用特殊的材料与特殊操作工艺，来保证其有效光反射系数不大于3.5%。一般说来，屏幕的对比度应在10左右，人眼才会有一个比较舒适的感觉

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आउटडोर विज्ञापन PH6 PH8 PH10mm SMD / श्रीमती 3in1 ठूलो स्क्रीन डिस्प्ले एलईडी

आउटडोर भाडा PH6 PH8 PH10mm SMD / श्रीमती 3in1 विशाल डिजिटल signages एलईडी, विद्युतीय एलईडी प्रदर्शन

utendørs reklame PH6 PH8 PH10mm SMD / SMT 3in1 LED store skjermen viser

utendørs utleie PH6 PH8 PH10mm SMD / SMT 3in1 LED gigantiske digitale signages, elektronisk LED-display

utendørs reklame PH6 PH8 PH10mm SMD / SMT 3in1 LED store skjermen viser

utendørs utleie PH6 PH8 PH10mm SMD / SMT 3in1 LED gigantiske digitale signages, elektronisk LED-display

Reklama zewnętrzna 3w1 PH6 PH8 PH10mm SMD / SMT duże wyświetlacze LED ekran

Wynajem PH6 3w1 zewnątrz PH8 PH10mm SMD / SMT LED gigantyczne signages cyfrowe, elektroniczne Wyświetlacz LED

publicidade exterior PH6 PH8 PH10mm SMD / SMT 3in1 LED grande tela exibe

externa Locação PH6 PH8 PH10mm SMD / SMT 3in1 LED sinalizações digitais gigantes, display LED eletrônico

ਬਾਹਰੀ ਇਸ਼ਤਿਹਾਰਬਾਜ਼ੀ PH6 PH8 PH10mm SMD / ਰਪਏ 3in1 ਵੱਡੀ ਸਕਰੀਨ, ਡਿਸਪਲੇਅ LED

ਬਾਹਰੀ ਕਿਰਾਏ ਤੇ PH6 PH8 PH10mm SMD / ਰਪਏ 3in1 ਅਲੋਕਿਕ ਡਿਜ਼ੀਟਲ signages LED, ਇਲੈਕਟ੍ਰਾਨਿਕ LED ਡਿਸਪਲੇਅ

publicitate outdoor 3in1 pH6 PH8 PH10mm SMD / SMT LED display de mari dimensiuni de ecran

de închiriere în aer liber pH6 3in1 PH8 PH10mm SMD / SMT LED signages digitale gigantice, afișaj electronic cu LED-uri

наружная реклама PH6 PH8 PH10mm SMD / SMT 3in1 LED большой экран дисплеев

открытый прокат PH6 PH8 PH10mm SMD / SMT 3in1 LED гигантские цифровые Signages, электронный

светодиодный дисплей

спољни рекламни ПХ6 ПХ8 ПХ10мм СМД / СМТ 3ин1 ЛЕД велике екране

спољни изнајмљивање ПХ6 ПХ8 ПХ10мм СМД / СМТ 3ин1 ЛЕД огромни сигнагес, електронски ЛЕД дисплеј

vonkajšia reklama PH6 PH8 PH10mm SMD / SMT 3in1 LED veľkoplošných obrazoviek

vonkajšia požičovňa PH6 PH8 PH10mm SMD / SMT 3in1 LED obrie digitálny Signages, elektronický displej LED

xayeesiinta banaanka 3in1 PH6 PH8 PH10mm SMD / SMT LED bandhigo shaashad ballaaran

outdoor kirada PH6 3in1 PH8 PH10mm SMD / SMT LED signages digital waxay Rafaa, oo elektaroonik ah bandhig LED

publicidad al aire libre 3in1 PH6 PH8 PH10mm SMD / SMT LED pantallas de gran tamaño

exterior Alquiler PH6 3in1 PH8 PH10mm SMD / SMT LED amplia señalización digitales gigantes, pantalla electrónica de LED

matangazo ya nje PH6 PH8 PH10mm SMD / SMT 3in1 LED maonyesho kubwa screen

nje ya kukodisha PH6 PH8 PH10mm SMD / SMT 3in1 LED kubwa digital signages, umeme kuonyesha LED

utomhusreklam PH6 PH8 PH10mm SMD / SMT 3in1 LED stora skärmar

utomhus hyra PH6 PH8 PH10mm SMD / SMT 3in1 LED jätte digitala signages,elektronisk LED-display

வெளிப்புற விளம்பர PH6 PH8 PH10mm SMD / திருமதி 3in1 பெரிய திரை காட்சிகள் LED

வெளிப்புற வாடகை PH6 PH8 PH10mm SMD / திருமதி 3in1 பெரிய டிஜிட்டல் signages LED, மின்னணு LED காட்சி

బహిరంగ ప్రకటనలు PH6 PH8 PH10mm SMD / SMT 3in1 పెద్ద స్క్రీన్ డిస్ప్లేలు LED

బహిరంగ అద్దె PH6 PH8 PH10mm SMD / SMT 3in1 దిగ్గజం డిజిటల్ Signages LED, ఎలక్ట్రానిక్ LED ప్రదర్శన

การโฆษณากลางแจ้ง 3in1 PH6 PH8 PH10mm SMD / SMT LED หน้าจอแสดงผลขนาดใหญ่

กลางแจ้งเช่า PH6 3in1 PH8 PH10mm SMD / SMT LED Signages ดิจิตอลยักษ์จอแสดงผล LED อิเล็กทรอนิกส์

açık hava reklam PH6 PH8 PH10mm SMD / SMT 3in1 büyük ekran LED ekranlar

açık kiralık PH6 PH8 PH10mm SMD / SMT 3in1 dev dijital signages LED, elektronik LED ekran

зовнішня реклама PH6 PH8 PH10mm SMD / SMT 3in1 LED великий екрандисплеїв

відкритий прокат PH6 PH8 PH10mm SMD / SMT 3in1 LED гігантські цифрові Signages, електронний світлодіодний дисплей

بیرونی اشتہارات PH6 PH8 PH10mm SMD / شریمتی 3in1 بڑی سکرین ڈسپلے ایل ای ڈی

بیرونی رینٹل PH6 PH8 PH10mm SMD / شریمتی 3in1 وشالکای ڈیجیٹل signages ایل ای ڈی، الیکٹرانک ایل ای ڈی ڈسپلے

quảng cáo ngoài trời 3in1 PH6 pH8 PH10mm SMD / SMT LED màn hình hiển thị lớn

ngoài trời cho thuê PH6 3in1 pH8 PH10mm SMD / SMT LED signages kỹ thuật số khổng lồ, màn hình LED điện tử

hysbysebion awyr agored 3in1 PH6 PH8 PH10mm SMD / Uwch Dîm Rheoli LED arddangosiadau sgrin fawr

awyr agored PH6 rhent 3in1 PH8 PH10mm SMD / Uwch Dîm Rheoli LED signages digidol mawr, arddangos LED electronig

דרויסנדיק גאַנצע פ6 פ8 פ10מם סמד / סמט 3ינ1 געפירט גרויס פאַרשטעלן דיספּלייז

דרויסנדיק פּראָקאַט פ6 פ8 פ10מם סמד / סמט 3ינ1 געפירט ריז דיגיטאַל סיגנאַגעס, עלעקטראָניש געפירט ווייַז

ita gbangba ìpolówó PH6 PH8 PH10mm SMD / SMT 3in1 LED large iboju han

ita gbangba yiyalo PH6 PH8 PH10mm SMD / SMT 3in1 LED omiran oni signages, itanna LED àpapọ

Ukukhangisa ongaphandle PH6 PH8 PH10mm SMD / SMT 3in1 LED screen display ezinkulu

Outdoor PH6 Rental PH8 PH10mm SMD / SMT 3in1 LED giant signages digital, electronic ukubonisa LED

SMT 3in1 LED Großbild-Displays Außen Vermietung PH6 PH8 PH10mm SMD

Außenwerbung PH6 PH8 PH10mm SMD / SMT 3in1 LED Großbild-Displays

Außen Vermietung PH6 PH8 PH10mm SMD / SMT LED-3in1 riesigen digitalen Leitsystemen, elektronische LED-Anzeige

buitelug-advertensies pH6 PH8 PH10mm SMD / SBS 3in1 LED groot skerm vertoon

buite huur pH6 PH8 PH10mm SMD / SBS 3in1 LED reuse digitale signages, elektroniese LED display

reklamat në natyrë 3in1 PH6 PH8 PH10mm SMD / SMT LED tregon të mëdha ekran

në natyrë me qira PH6 3in1 PH8 PH10mm SMD / SMT LED Signages gjigande dixhitale, ekran elektronik LED

الاعلان في الهواء الطلق 3IN1 PH6 PH8 PH10mm مصلحة الارصاد الجوية / SMT الصمام يعرض على الشاشة الكبيرة

في الهواء الطلق تأجير PH6 3IN1 PH8 PH10mm مصلحة الارصاد الجوية / SMT LED سيجناجيس الرقمية العملاقة، شاشة LED الإلكترونية

Արտաքին գովազդ PH6 PH8 PH10mm SMD

/ SMT 3in1 LED մեծ էկրանի ցուցադրում

Արտաքին վարձույթ PH6 PH8 PH10mm SMD / SMT 3in1 LED հսկա թվային Signages, էլեկտրոնային LED էկրան

açıq reklam PH6 PH8 PH10mm SMD / SMT 3in1 böyük ekran LED

açıq icarə PH6 PH8 PH10mm SMD / SMT 3in1 nəhəng digital siqnallar LED, elektron LED ekran

kanporako publizitate PH6 PH8 PH10mm SMD / SMT 3in1 LED pantaila handi

kanporako alokairua PH6 PH8 PH10mm SMD / SMT 3in1 LED Signages digital erraldoia, LED pantaila elektronikoak

вонкавая рэклама PH6 PH8 PH10mm SMD / SMT 3in1 LED вялікі экран дысплеяў

адкрыты пракат PH6 PH8 PH10mm SMD / SMT 3in1 LED гіганцкія лічбавыя Signages, электронны святлодыёдны дысплей

вонкавая рэклама PH6 PH8 PH10mm SMD / SMT 3in1 LED вялікі экран дысплеяў

адкрыты пракат PH6 PH8 PH10mm SMD / SMT 3in1 LED гіганцкія лічбавыя Signages, электронны святлодыёдны дысплей