中文摘要：

随着电子技术的发展．公其屏幕成为城市信息传播的重要载体，屏幕文化成为城市文化中的重要部分。然而公共屏幕的发展对城市传播而言无疑一把双刃剑：一方面公共屏幕更新了城市空间设计固有模式，改变与提升了原有城市具象空间秩序，构建新场域视觉中心，演化出若干有效微观城市地标：同时，交互式的公共屏幕也为受众提供多种参与经验，增加公民城市认同与归属感．但另一方面，粗制滥造的传播内容，简单重复的播放方式，以及光污染带来的负面效应，深刻地影响了当今城市公共屏幕健康发展。本文以广州城市为主要研究对象。采用案例分析、问卷调查、访谈及深度观察等方法，简要展示广州公共屏幕目前在城市发展中的现状。从设计学、传播学的角度对其有效性进行阐释，主要包括屏幕位置选择、交互方式的改进、字体与色彩设计的要点等．本文试图为这类社会实践提供一点理论支撑：

英文摘要：

With the development of intelligent vision and digi- tal, the public screen plays an important role at the urban infbmaa- tion communication and public screen culture becomes an essential part of urban culture. However, there are two aspects of the use of urban public screen. First, it updates urban space inherent design mode and changes the order of urban specific space. Then it creates some visual centers and evolves into mini city landmarks. At the same time, interactive public screen can provide a variety of partic- ipation experiences and increase the sense of urban identity belong to citizen. Secondly, some negative effects hinder the suitable de- velopment of urban public screen, including the shoddy spread content, simple repeat playback, and light pollution and so on. This paper selects Guangzhou city as research object and re- veals the stares of the development of urban public screen in the city with many methods including case study, survey, and interview and observe people etc. Under the angle of design and comnmni- cation, this paper analyzes several factors of the effectiveness of the public screen spread, including screen position, interaction and the desigm of font and colors. We try to provide a little theoretical sup- port for such social practice.