Browsing by Author "Tsai, Yu-Hsiang"

Now showing 1 - 4 of 4

A Development of Color-filter-free Electrowetting Color Display by Using Ink Jet Printing Technology
(2010)
Kuo, Shu-Wei
;
Lo, Kuo-Long
;
Cheng, Wei-Yuan
;
Ku, Yun-Sheng
;
Lee, Hsin-Hung
We evaluated the single layer multi-color electrowetting display (EWD) device by using various colored oils without adopting color filter. The color mediums were various colored oil that dosed into sub-pixels by ink jet printing (IJP) technique. In order to improve the color saturation of EWD, the dissolved fluxes had used to increase the solubility of various dyes. The colored saturation could increase about 50%. However, the unstable fluid movement was observed under AC square waveform driving. Therefore, simulation was utilized to analyze the phenomenon of unstable fluid movement. After optimizing the electrode pattern design of the EWD, the improvement of fluid movement was achieved.
Image quality affected by diffraction of aperture structure arrangement in transparent active-matrix organic light-emitting diode displays
(2015-10-01)
Tsai, Yu-Hsiang
;
Huang, Mao-Hsiu
;
Jeng, Wei-de
;
Huang, Ting-Wei
;
Lo, Kuo-Lung
Transparent display is one of the main technologies in next-generation displays, especially for augmented reality applications. An aperture structure is attached on each display pixel to partition them into transparent and black regions. However, diffraction blurs caused by the aperture structure typically degrade the transparent image when the light from a background object passes through finite aperture window. In this paper, the diffraction effect of an active-matrix organic light-emitting diode display (AMOLED) is studied. Several aperture structures have been proposed and implemented. Based on theoretical analysis and simulation, the appropriate aperture structure will effectively reduce the blur. The analysis data are also consistent with the experimental results. Compared with the various transparent aperture structure on AMOLED, diffraction width (zero energy position of diffraction pattern) of the optimize aperture structure can be reduced 63% and 31% in the x and y directions in CASE 3. Associated with a lenticular lens on the aperture structure, the improvement could reach to 77% and 54% of diffraction width in the x and y directions. Modulation transfer function and practical images are provided to evaluate the improvement of image blurs. (C) 2015 Optical Society of America
Oil defect detection of Electrowetting Display
(2015-01-01)
Chiang, Hou-Chi
;
Tsai, Yu-Hsiang
;
Yan, Yung-Jhe
;
Huang, Ting-Wei
;
Ou-Yang, Mang
In recent years, transparent display is an emerging topic in display technologies. Apply in many fields just like mobile device, shopping or advertising window, and etc. Electrowetting Display (EWD) is one kind of potential transparent display technology advantages of high transmittance, fast response time, high contrast and rich color with pigment based oil system. In mass production process of Electrowetting Display, oil defects should be found by Automated Optical Inspection (AOI) detection system. It is useful in determination of panel defects for quality control. According to the research of our group, we proposed a mechanism of AOI detection system detecting the different kinds of oil defects. This mechanism can detect different kinds of oil defect caused by oil overflow or material deteriorated after oil coating or driving. We had experiment our mechanism with a 6-inch Electrowetting Display panel from ITRI, using an Epson V750 scanner with 1200 dpi resolution. Two AOI algorithms were developed, which were high speed method and high precision method. In high precision method, oil jumping or non-recovered can be detected successfully. This mechanism of AOI detection system can be used to evaluate the oil uniformity in EWD panel process. In the future, our AOI detection system can be used in quality control of panel manufacturing for mass production.
See-Through Image Blurring of Transparent Organic Light-Emitting Diodes Display: Calculation Method Based on Diffraction and Analysis of Pixel Structures
(2016-11)
Qin, Zong
;
Tsai, Yu-Hsiang
;
Yeh, Yen-Wei
;
Huang, Yi-Pai
;
Shieh, Han-Ping David
In this paper, the issue of see-through image blurring of transparent organic light-emitting diodes display is demonstrated, and a systematic method is proposed to calculate blurred see-through image based on diffraction theory. In the calculation, distances of background object and the viewer are considered to correct Fresnel diffraction and chromatic image can be finally synthesized. Calculated and actually captured see-through images match well by using different background distances and pixel structures to verify, as error ratio of only 2.3% and 4.3%, respectively, in the term of blurred image\'s fringe length. Based on the calculation results, see-through image qualities corresponding to four pixel structures are evaluated and two structures are verified to have better image quality. Finally, higher resolutions that lead to much more significant see-through image blurring are discussed.