Browsing by Author "Huang, Yi-Pai"

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2-D/3-D switchable autostereoscopic display with multi-electrically driven liquid-crystal (MeD-LC) lenses
(2010-09-01)
Huang, Yi-Pai
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Liao, Lin-Yao
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Chen, Chih-Wei
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光電工程學系
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顯示科技研究所
A cylindrical multi-electrically driven liquid-crystal lens (MeD-LC lens) is proposed to extend the range of focusing. The MeD-LC lens could be applied to switching 2-D and 3-D images by supplying a specific operating voltage on each electrode. Therefore, the MeD-LC lens has less cross-talk than that of a conventional LC lens. Furthermore, the simplified structure of a MeD-LC lens with a homogeneous LC layer is much easier for fabrication without a LC-alignment issue.
3D Air-Touch User Interface With High Touch Accuracy on Stereoscopic Displays
(2016-05)
Ting, Chih-Hung
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Jen, Tai-Hsiang
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Chen, Chun-Ho
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Shieh, Han-Ping D.
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Huang, Yi-Pai
To interact with stereoscopic images through 3D air-touch technology, the depth information for a touched 3D virtual object and the fingertip position should be aligned accurately. However, the fused 3D position is affected when the virtual object is blocked by the fingertip. Additionally, the 3D image with a large disparity decreases 3D touch accuracy. In order to improve the touch accuracy, virtual references and 3D image feedback were introduced respectively, and the touch accuracy was more than 90% based on a human interaction experiment.
3D interactive system based on vision computing of direct-flective cameras
(2016-08)
Li, Xuan
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Chen, Chun-Ho
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Huang, Yi-Pai
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光電工程學系
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Department of Photonics
A bare-finger 3D interactive technology for portable devices was developed. Using directive-flective cameras to reform the field of viewing, a blind working range close to the camera is eliminated. Moreover, the algorithm of vision computing, different from skin color detection, is presented to determine the positions of fingertips. The interactive range is workable from 1.5 to 50 cm above the entire surface of the display. The mean position error of less than 1 cm is achieved. This accuracy realizes a camera-based 3D interactive system allowing for near-distance functionality. Therefore, floating 3D images can be touched and interacted with, potentially creating more application and intuitive user-machine interface.
3D Interactive System Using Integral Photography by Embedded Optical Sensors for Portable Devices
(2016-11)
Chen, Chun-Ho
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Ting, Chih-Hung
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Huang, Yi-Pai
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光電工程學系
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顯示科技研究所
An air-touch interactive system for portable devices is presented. An embedded optical sensor based on this approach was developed to realize a lightweight and thin-form-factor three-dimensional (3-D) interactive system. Using integral photography, the 3-D coordinates of an object are calculated. Moreover, the micro-lens array is implemented to improve the working range to 80 mm and achieve a position error of less than 5 mm. The spatial resolution in x-y and z domains is 1 and 5 mm, respectively. In addition, this system can also support a gesture vector sensing function in the far field up to 150 mm.
A 2D/3D Hybrid Integral Imaging Display by Using Fast Switchable Hexagonal Liquid Crystal Lens Array
(2017-01-01)
Lee, Hsin-Hsueh
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Huang, Ping-Ju
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Wu, Jui-Yi
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Hsieh, Po-Yuan
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Huang, Yi-Pai
The paper proposes a new display which could switch 2D and 3D images on a monitor, and we call it as Hybrid Display. In 3D display technologies, the reduction of image resolution is still an important issue. The more angle information offer to the observer, the less spatial resolution would offer to image resolution because of the fixed panel resolution. Take it for example, in the integral photography system, the part of image without depth, like background, will reduce its resolution by transform from 2D to 3D image. Therefore, we proposed a method by using liquid crystal component to quickly switch the 2D image and 3D image. Meanwhile, the 2D image is set as a background to compensate the resolution.. In the experiment, hexagonal liquid crystal lens array would be used to take the place of fixed lens array. Moreover, in order to increase lens power of the hexagonal LC lens array, we applied high resistance (Hi-R) layer structure on the electrode. Hi-R layer would make the gradient electric field and affect the lens profile. Also, we use panel with 801 PPI to display the integral image in our system. Hence, the consequence of full resolution 2D background with the 3D depth object forms the Hybrid Display.
A 3D Index (Delta X-3D) for Evaluating Image Quality of Stereoscopic Displays
(2015-10-01)
Chang, Yu-Cheng
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Chien, Yu-Yi
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Huang, Yi-Pai
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光電工程學系
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Department of Photonics
In stereoscopic displays, crosstalk is typically observed when the views for both eyes are not clearly separated. Crosstalk affects the quality of 3D images and can cause visual fatigue in observers. According to the results of perception experimentation, different visual depth (disparity) and motion blur can also affect the perception of 3D image quality. Therefore, considering the effects of crosstalk, disparity, and motion blur, we propose an evaluation index to quantify 3D image performance for stereoscopic displays. This index assesses the optical quality of a 3D display as well as the effects of image content. According to human vision experimentation, the 3D image index (Delta X-3D) is validated to have a high positive correlation (0.8) with human perception. After combining the human visual mechanism and Delta X-3D, the proposed index can represent the visual quality of static and dynamic images on stereoscopic displays.
A Color Break-Up Suppression Method, Stencil-FSC Method, for Field-Sequential-Color(FSC) LCDs with low Power Consumption
(2008)
Huang, Yi-Pai
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Lin, Fang-Cheng
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Wei, Ching-Ming
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Shieh, Han-Ping D.
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Tsai, Chi-Chung
Field sequential color liquid crystal display (FSC-LCDs) is a display without color filter, so it achieves several attractive advantages. However, it has a serious issue called color breakup (CBU), which degrades image quality and causes viewers uncomfortable. Consequently, the "Stencil-FSC" method, which utilized multi-color image in a single field, was proposed to suppress CBU. Moreover, optimizations of hardware parameters were done to get the optimal CBU suppression. Finally, the Stencil-FSC method was successfully demonstrated on a 32-inch FSC-LCD with effectively suppressed CBU, resulting contrast ratio of more than 5,500:1, and average power consumption of less than 45 Watt.
A Direct-View Backlight With UV Excited Trichromatic Phosphor Conversion Film
(2010-04-01)
Huang, Hsin-Tao
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Tsai, Chuang-Chuang
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Huang, Yi-Pai
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光電工程學系
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顯示科技研究所
This work presents a novel ultraviolet (UV) excited flat lighting (UFL) system consisting of remote phosphor converter (RPC) for liquid-crystal display (LCD) backlight applications. A trichromatic RPC is excited using 254 nm UV lamps to achieve a slim, high color saturation and high luminance backlight. Experimental results indicate that the module thickness reduces to 14.5 mm, along with a high color saturation (92% of the NTSC standard) as well as a high luminance (573 cd/m(2)) when applied to large sized display (42-inch). Additionally, the proposed UFL backlight configuration has already been certified by a lifetime test to ensure the feasibility of proposed system in mass production.
A field sequential color LCD base on color field arrangement for color breakup and flicker reduction
(2007)
Hsu, Ya-Ting
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Lin, Fang-Cheng
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Chen, Chun-Ho
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Huang, Yi-Pai
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Shieh, Han-Ping D.
Field sequential color liquid crystal displays (FSC-LCDs) have several original benefits, including higher light efficiency, definition, and color saturation than those of conventional LCDs. However, FSC-LCDs are well known that the color breakup (CBU) is the serious issue needed to be solved. We have developed a new driving technique on a 5.6-inch OCB mode FSC-LCD. This proposed 4-color field arrangement (4-CFA) method can effectively eliminate the CBU of FSC-LCDs.
A Field Sequential Color LCD Based on Color Fields Arrangement for Color Breakup and Flicker Reduction
(2009-01-01)
Chen, Chun-Ho
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Lin, Fang-Cheng
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Hsu, Ya-Ting
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Huang, Yi-Pai
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Shieh, Han-Ping D.
The field sequential color (FSC) mechanism can effectively generate multi-primary color fields in temporal sequence to form a full-color image. Color breakup (CBU), however, has appeared intrinsically in conventional FSC displays to degrade visual qualities. A novel CBU suppression method, color fields arrangement (CFA), was proposed to eliminate the artifacts for FSC liquid crystal displays (LCDs). The modified order of consecutive color fields results in superimposed color images on a retina without CBU. Additionally, the 4-CFA method with a field rate of 240 Hz was found to avoid the flicker phenomenon on static images. The proposed method was successfully implemented on a 5.6-in optically compensated bend (OCB) LC panel. Our results confirm that the visibility of CBU artifacts can be reduced as the evaluation of dynamic and static models.
A Horizontal Parallax Table-top Floating Image System with Freeform Optical Film Structure
(2016-01-01)
Chou, Ping-Yen
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Huang, Yi-Pai
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Liao, Chien-Chung
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Chang, Chuan-Chung
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Chuang, Fu-Ming Fleming
In this paper, a new structure of horizontal parallax light field 3D floating image display system was proposed. The structure consists of pico-projectors, Fresnel lens, micro-lens array and sub-lens array with freeform shape. By the functions of optical components, each light field of projectors could be controlled as a fan ray, which has high directivity in horizontal and wide scattered angle in vertical. Furthermore, according to the reverse light tracing and integral image display technique, horizontal parallax floating 3D could be demonstrated in the system. Simulated results show that the proposed 3D display structure has a good image quality and the crosstalk is also limited below 22.9%. Compared with other 3D technologies, this structure could have more benefits, including displaying real high resolution floating image, unnecessary of physical hardware on the image plane, scalability of large size system, without the noise from spinning component, and so on.
A human visual model for color break-up artifact in design field-sequential color LCDs
(2007)
Chen, Sheng-Chang
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Yan, Shu-Ping
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Cheng, Yu-Kuo
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Lin, Fang-Cheng
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Wei, Ching-Ming
A model to evaluate the color break-up (CBU) of field-sequential color liquid crystal display (FSC-LCD) had been successfully established. In order to quantify the CBU, "Color Break-Up Angle (CBUA)" was proposed as the evaluation index. From the psychophysical experiments, the CBUA=0.26 degrees was reported as the averaged threshold value for indistinguished color break-up. Consequently, the minimum frame rate could be derived from the model to suppress CBU in the various FSC-LCDs.
A novel patterned diffuser for high uniform and high bright LCD backlights
(2007)
Lo, Yu-Chun
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Fang, Jen-Yu
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Huang, Yi-Pai
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Shieh, Han-Ping D.
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Yu, Gu-Sheng
A novel patterned diffuser of which the diffusivity can be optimized spatially for the non-uniform luminance distribution backlights. was designed and realized. An 11% improvement in the brightness uniformity was successfully demonstrated in a 7-in side-edge backlight without sacrificing the brightness.
A real-time image compensation for high dynamic range LCDs
(2008)
Liao, Lin-Yao
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Huang, Yi-Pai
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Yeh, Szu-Che
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光電工程學系
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Department of Photonics
Blur-mask approach (BMA) was developed to simulate the light distribution of locally-controlled dimming LED backlight with much lower computational complexity which is less than 1% of that of conventional convolution method, Blur-mask approach was successfully demonstrated on a 37 '' HDR LCD-TV with real-time modification to perform high quality image (Less image distortion) and high contrast ratio (similar to 20,000:1 with test image-Lily).
A real-time liquid crystal signal compensation method for high dynamic range LCD
(2007)
Liao, Lin-Yao
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Lin, Fang-Cheng
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Huang, Yi-Pai
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Shieh, Han-Ping D.
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Yeh, Szu-Che
Blur-mask approach was developed to simulate the backlight distribution of locally-controlled dimming LED backlight with lower computational complexity which is less than 1% of conventional convolution method. The If blur-mask approach was demonstrated to perform high image, quality and high contrast ratio (similar to 20,000 : 1) on a 37" LCD-TV. Compared with convolution, blur-mask approach has much lower computational complexity and succesfully demonstrated for real-time application.
A toroidal-lens designed structure for static type table-top floating image system with horizontal parallax function
(2017-07-01)
Chou, Ping-Yen
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Wu, Jui-Yi
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Hsieh, Po-Yuan
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Chen, Chun-Ho
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Yu, Zih-Sin
A new structure of horizontal parallax table-top floating image system with toroidal-lens optical film was developed. In this design, the circular arranged pico-projectors limit the angular resolution of this system and display the floating image for surrounding viewing zones. In addition, the pinhole array and toroidal-lens layer compose the optical film in the system and correspond with each other; both of them could be considered as a repeatable unit to control the spatial resolution of image. After passing through the optical film, the direction, position, shape, and divergence angle of light field could be controlled as fan ray, which has a widely scattered angle in latitude and high directivity in longitude direction. Moreover, to confirm the optical properties, the proposed structure was built in the commercially optical software, LightTools v8.3, which is widely used in the simulation of light distribution. Based on the imaging principle and the inverse light tracking method, displaying floating image with circular viewing zones would be achieved.
A visual model of color break-up for design field-sequential LCDs
(2007)
Yan, Shu-Ping
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Cheng, Yu-Kuo
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Lin, Fang-Cheng
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Wei, Ching-Ming
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Huang, Yi-Pai
A model to evaluate the color break-up (CBU) of field-sequential color liquid crystal display (FSC-LCD) had been successfully established. In order to quantify the CBU, "Color Break-Up Angle (CBUA)" was proposed as the evaluation index. Front the psychophysical experiments. the CBUA=0.22 degrees was reported ass the averaged threshold value for indistinguished color break-up. Consequently, the minimum frame rate could be derived from the model to suppress CBU in the various FSC-LCDs.
Adaptive LC/BL feedback control in field sequential color LCD technique for color breakup minimization
(2008-09-01)
Huang, Yi-Pai
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Chen, Ke-Horng
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Chen, Chun-Ho
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Lin, Fang-Cheng
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Shieh, Han-Ping D.
A full-color image on field sequential color (FSC) displays is composed of color fields in temporal sequence. With the FSC mechanism, color filters of liquid crystal displays (LCDs) can be removed to heighten the light efficiency and lower the material cost. Color breakup (CBU), however, has appeared intrinsically to degrade visual qualities. A novel gray level determination of liquid crystal and backlight (LC/BL) was proposed to suppress the CBU artifact on FSC-LCDs. Based on the image content in each frame, a dominated color-mixed field was found to minimize the color difference between the CBU and original image. Additionally, the feedback algorithm for the adaptive LC/BL signals was developed and implemented on a 32-inch optically compensated bend (OCB) mode LC panel. According to the evaluation of experiments and observations, the proposed method has been demonstrated to greatly suppress CBU in LCD applications.
Additional Refresh Technology (ART) of advanced-MVA(AMVA) mode for high quality LCDs
(2007)
Huang, Yi-Pai
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Huang, Wei-Kai
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Tsao, Cheng-Han
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Su, Jeng-Jia
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Hou, Hong-Lung
We proposed "Additional Refresh Technology(ART)", which has the features of low color washout and fast response speed by only modifying the pixel layout. Besides, by utilizing ART technology, the image can be real time optimized with simple method. ART have succesfully been implemented as the Advanced-MV4 (AMVA) mode for AUO's LCD-TV products, that ART has become the promising solution of advanced LCD-TV panels for mass-production.
Advanced Technologies for High Quality LC Display
(2008)
Huang, Yi-Pai
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Lin, Fang-Cheng
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Liao, Cheng-Yumr
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Hsu, Ya-Ting
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Huang, Wei-Kai
For achieving high quality LC displays, Advanced-MVA mode was proposed to wide the viewing angle, 4-color filed sequential method was utilized to increase the optical efficiency, and the local controlled LED backlight was applied to much improve the contrast and lower the power consumption.