Huadong Photoelectric Ltd Corporation of AVIC

Wuhu, China

Huadong Photoelectric Ltd Corporation of AVIC

Wuhu, China
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Zhang X.-B.,Huadong Photoelectric Ltd Corporation of AVIC | Zhang X.-B.,Anhui University of Technology | Wang S.-J.,Huadong Photoelectric Ltd Corporation of AVIC | Wang S.-J.,Anhui University of Technology | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

There are shortcomings of low precision, touch shaking, and sharp decrease of touch precision when emitting and receiving tubes are failure in the infrared touch screen. A high precision positioning algorithm based on extended axis is proposed to solve these problems. First, the unimpeded state of the beam between emitting and receiving tubes is recorded as 0, while the impeded state is recorded as 1. Then, the method of oblique scan is used, in which the light of one emitting tube is used for five receiving tubes. The impeded information of all emitting and receiving tubes is collected as matrix. Finally, according to the method of arithmetic average, the position of the touch object is calculated. The extended axis positioning algorithm is characteristic of high precision in case of failure of individual infrared tube and affects slightly the precision. The experimental result shows that the 90% display area of the touch error is less than 0.25D, where D is the distance between adjacent emitting tubes. The conclusion is gained that the algorithm based on extended axis has advantages of high precision, little impact when individual infrared tube is failure, and using easily. © 2016 SPIE.


Zhang X.-B.,Huadong Photoelectric Ltd Corporation of AVIC | Zhang X.-B.,Hefei University of Technology | Zhang X.-B.,Anhui University of Technology | Liu X.,Anhui University of Technology | And 3 more authors.
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2012

A dynamic global backlight dimming algorithm is proposed based on the analysis of the Cumulative Distribution Function (CDF) of 12 local images histogram. For each image, the proposed algorithm decided Backlight Luminance (BL) dynamically from maximum CDF luminance ratio of 12 local regions instead of the value of the whole image. Ratios of backlight luminance are defined between 0.6 and 0.9, in order to preserve quality of images and decrease power consumption. The experimental results show that the improved method significantly improves the image quality of Liquid Crystal Display (LCD) and substantially reduces the power consumption, which also meets requirement of the PSNR rule.


Zhang X.-B.,Huadong Photoelectric Ltd Corporation of AVIC | Zhang X.-B.,Hefei University of Technology | Zhang X.-B.,Anhui University of Technology | Liu X.,Anhui University of Technology | And 3 more authors.
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2012

Dynamic backlight plays an important role in reducing power consumption of liquid crystal displays. Considering it is more important to make sure a high quality of the displayed image when reducing power consumption, a new algorithm was proposed for local backlight dimming of liquid crystal displays. According to the algorithm, PSNR (the peak signal-to-noise ratio) = 30 was the lowest standard to guarantee the quality of image, by which the backlight luminance was gained and the distortion was controlled into a certain range. Meanwhile, a method is also proposed to simplify the calculation. Successive searches will be made on the basis of the 0.7, 0.8 and 0.9 times of the maximum luminance, and stop when R PSNR ≥ 30. In order to guarantee the quality of the image, the 0.7 times of the maximum luminance is used as the minimum backlight luminance. It saves much time in calculation and is better applied in hardware.

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