外部光反射参数对LED显示屏全视角对比度的影响

郝亚茹; 陈宇; 汪洋; 丁铁夫; 杜国同; 王瑞光

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外部光反射参数对LED显示屏全视角对比度的影响

论文 | 更新时间：2020-08-12

- 外部光反射参数对LED显示屏全视角对比度的影响
- The Influence of the Reflection Parameters of the External Light on Contrast Distribution at any Visual Angle in Large-area LED Display Panel
- 发光学报 2008年29卷第2期页码：398-404
- 作者机构：
  
  1. 中国科学院, 研究生院北京,100049
  2. 中国科学院, 长春光学精密机械与物理研究所,吉林长春,130033
  3. 吉林大学, 集成光电子学国家重点实验室,吉林长春,130012
  4. 吉林大学, 电子科学与工程学院,吉林长春,130023
- 作者简介：
- 基金信息：
- DOI：
  中图分类号： TN919.8
- 收稿：2007-08-17，
  
  修回：2007-12-24，
  
  纸质出版：2008-03-20
- 稿件说明：
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郝亚茹, 陈宇, 汪洋, 丁铁夫, 杜国同, 王瑞光. 外部光反射参数对LED显示屏全视角对比度的影响[J]. 发光学报, 2008,29(2): 398-404

HAO Ya-ru, CHEN Yu, WANG Yang, DING Tie-fu, DU Guo-tong, WANG Rui-guang. The Influence of the Reflection Parameters of the External Light on Contrast Distribution at any Visual Angle in Large-area LED Display Panel[J]. Chinese Journal of Luminescence, 2008,29(2): 398-404
郝亚茹, 陈宇, 汪洋, 丁铁夫, 杜国同, 王瑞光. 外部光反射参数对LED显示屏全视角对比度的影响[J]. 发光学报, 2008,29(2): 398-404 DOI：

HAO Ya-ru, CHEN Yu, WANG Yang, DING Tie-fu, DU Guo-tong, WANG Rui-guang. The Influence of the Reflection Parameters of the External Light on Contrast Distribution at any Visual Angle in Large-area LED Display Panel[J]. Chinese Journal of Luminescence, 2008,29(2): 398-404 DOI：

摘要

由于对比度计算方法的局限性使得计算得到的对比度值与LED显示屏在实际中的显示效果会出现不吻合的现象。针对此现象主要对两个方面的内容进行分析。首先

分析LED测量方法中对比度与视角之间的相互关系

在此基础上建立各视角对比度参数。并且利用实际测得的此参数结果与通过LED测量方法计算的数据作对比

表明利用计算方法计算得到的对比度值与实际上在复杂因素的影响下采集得到的对比度结果存在差异

证实各视角对比度参数的计算方法存在问题。其次

分析外部影响参数如测量角度、反射参数在简单光照明下的模型

利用此模型计算得到背景亮度函数曲线

并与实验测得的背景亮度结果作对比

证明了两者结果的一致性。在此基础上

就可以以此模型为背景亮度函数式建立新对比度函数表达式

通过此表达式模拟显示屏上各视角对比度

使得到的函数曲面与使用LED测量方法计算得到的函数曲线相比较

证实LED测量方法中对比度计算方法的理想化

并说明了产生上述不吻合现象的原因。

Abstract

The limitation of the original definition of the contrast brings about the misconstruing of computing method of panel contrast in some cases where the display effect of LED panel to be appraised. Because of the existing of the misconstruing in some cases

two problems have to be solved primarily in this paper.Generally

the display effect of the LED panel is influenced by many factors (indexes)

such an stability

luminance

chromo-contrast

visual angle

etc. But the main indexes inducing the misconstruing mentioned above are contrast and visual angle. So

first of all

the relationship between the contrast calculated by the test method of the LED panel and the visual angle need to be analysed

and a new index

so-called the contrast distributed at any visual angle

must be established to present the relation of the both indexes. As the same act of other indexes

the new index will be used to evaluate the display effect of the LED panel. So at first

the maximal panel brightness and the minimal panel brightness at any visual angle can be measured by BM-7 under a certain illumination intensity

and the contrast at any visual angle will be calculated. On the other hand

the contrast can be calculated by the expression of the test method of LED panel. By comparison

the difference between the results calculated by the both methods mentioned above exists

and the difference is very obvious. The experimental results indicate that the values of the contrast at any visual angle between that computed by LED panel measurement method and that calculated by the real panel brightness are also diffe-rent

and it was also proved that the results from LED panel measurement method are out of accord with the real display effect of LED panel.Secondly

the reason why the computing method is out of accord with the real display effect is due to the complex factors in the real surroundings. So the model of the main external factors which effect the values of the contrast in the real conditions must be analysed in detail

such as the measurement angle and the reflection parameters of extraneous light. Using the module of the reflection parameters

the minimal brightness curve of the extraneous light can be obtained.And comparing with the values measured by BM-7

it is concluded that the main characteristic consistence of two kinds of the curves obtained by different methods exists. Based on the conclusion

using the mo-del of the external factors

a new expression of the contrast can be established to evaluate the display effect of LED panel. And by using this new function relation

the curved surface of the contrast at any visual angle can be simulated. In comparing with the curve of contrast computed by the test method of IED panel

it was proved that the computing method of contrast in the test method of LED panel

as without thinking of the influence of specular reflection of extraneous light

is so idealization

sometimes its result could be not agree with the real display effect of LED panel. Thus

the misconstruing problem can be explained and resolved.

关键词

Keywords

references

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