公开(公告)号：US20130222346A1

公开(公告)日：2013-08-29

申请号：US13739566

申请日：2013-01-11

Applicant: PixArt Imaging Inc.

Inventor： Hsin-Chia CHEN ,  Hui-Hsuan CHEN ,  Cheng-Kuang SUN ,  Ming-Tsan KAO

IPC: G06F3/042

CPC classification number: G06F3/0425 ,  G06F3/0416 ,  G06F2203/04108

Abstract: There is provided an optical touch device including a light source, a light control unit, a light guide, an image sensor and a processing unit. The light control unit controls the light source to illuminate in different brightness values. The light guide has an incident surface, a touch surface and an ejection surface, wherein the light source emit incident light into the light guide through the incident surface, and a plurality of microstructures are formed inside of and/or on the ejection surface of the light guide to disperse the incident light toward the touch surface to become dispersed light. The image sensor receives reflected light ejecting from the ejection surface to generate image frames corresponding to the different brightness values of the light source. The processing unit calculates a differential image of the image frames to accordingly identify an operating state.

Abstract translation: 提供了一种包括光源，光控制单元，光导，图像传感器和处理单元的光学触摸装置。 光控制单元控制光源以不同的亮度值照亮。 光导具有入射表面，触摸表面和喷射表面，其中光源通过入射表面将入射光发射到光导中，并且多个微结构在其内部和/或喷射表面上形成 将入射光分散到触摸表面的光导向分散光。 图像传感器接收从喷射表面喷射的反射光，以产生对应于光源的不同亮度值的图像帧。 处理单元计算图像帧的差分图像以相应地识别操作状态。