[Paper] Autostereoscopic Displays with Time-multiplexed Directional Backlight Using Curved Lens Arrays
[Paper] Autostereoscopic Displays with Time-multiplexed Directional Backlight Using Curved Lens Arrays
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[论文] 使用弯曲透镜阵列的时分复用定向背光的自动立体显示器
DOI：
10.3169/mta.9.80
复制
发表时间：
2021
影响因子：
3.6
通讯作者：
H. Kakeya
中科院分区：
文献类型：
--
作者：
Garimagai Borjigin;H. Kakeya
传统的自动立体显示器大多基于视差栅栏或透镜，这两种方法都有一个缺点，即所提供的图像的分辨率低于它们使用的LCD面板的原始分辨率。例如，当应用传统的无源栅栏时，图像分辨率变为面板分辨率的一半或更低。时分复用技术可以实现分辨率与面板相同的视图。主动视差屏障是实现该方法的典型方法[1-8]。交替条纹栅栏的奇数列和偶数列并将其与显示面板上的图像同步，观众可以看到全分辨率的立体图像。实现这一目标的另一种方法是使用时分多路定向背光[9-11]。通过交替地将定向光线传送到每只眼睛，并使其与LCD面板上的右眼和左眼图像的交替同步，可以获得全分辨率的立体图像。获得定向背光的常见方法之一是使用凸透镜和主动光源相结合。由大口径凸透镜和点阵光源组成的显示系统可以实现多视点的自动立体观察[12]。然而，所需的光学距离很深，并且系统变得笨重。为了减小显示硬件的厚度，已经提出使用凸透镜阵列[13-16]。然而，由于透镜阵列中存在明显的接缝，成像质量较差。Ishizuka等人。通过在透镜阵列[17，18]前面使用垂直漫射器实现了图像的均匀亮度。通过在每个RAW[19，20]中进行不同相移的透镜对准，进一步提高了背光的均匀性。然而，由于透镜的场曲，该系统的串扰水平很高。追求较低的串扰水平，Mukai等人。提出了一种放置大口径透镜以减少像差的方法[21]。然而，这种显示系统中使用的两层菲涅尔透镜不仅需要繁重的光学计算，而且会产生杂散光导致串扰。为了解决这个问题，已经提出了一种使用单层偏心透镜阵列的定向背光系统，但串扰水平还不够低[22]。在本文中，我们提出了一种使用曲面透镜阵列来降低串扰水平的自动立体显示系统。此外，通过由梯形元素透镜组成的透镜阵列实现了图像质量的改善和较低的串扰水平。
Conventional works on autostereoscopic displays are mostly based either on parallax barrier or on lenticular lens, both of which have a drawback that the resolution of the provided image is lower than the original resolution of the LCD panel they use. For example, the image resolution becomes half of the panel resolution or less when a conventional passive barrier is applied. Time-division multiplexing technology can realize a view having the resolution equal to that of the panel. The active parallax barrier is a typical way to implement this method [1-8]. Alternating the odd and even columns of the striped barrier and synchronizing it with the image on the display panel, the viewers can see a full resolution stereoscopic image. Another way to attain this goal is to use a timemultiplexed directional backlight [9-11]. By delivering the directional light rays to each eye alternatively and synchronizing it with the alternation of right-eye and left-eye images on the LCD panel, a full resolution stereoscopic image can be attained. One of the common ways to attain a directional backlight is to use a convex lens combined with an active light source. A display system composed of a large aperture convex lens and a dot-matrix light source can attain autostereoscopy with plural viewpoints [12]. However, the required optical distance is deep and the system becomes bulky. To reduce the thickness of display hardware, use of a convex lens array has been proposed [13-16]. However, the image quality is poor because of the distinct seam in the lens array. Ishizuka et al. have realized homogenous brightness of image by using a vertical diffuser in front of the lens array [17, 18]. The uniformity of backlight is further increased by lens alignment with various phase shifts in each raw [19, 20]. The crosstalk level of this system, however, is high due to the field curvature of lenses. Pursuing a lower crosstalk level, Mukai et al. have proposed a method to place a large aperture lens to reduce aberration [21]. However, two layers of Fresnel lenses used in this display system not only requires heavy optical calculation, but also produces stray light causing crosstalk. As a solution to this problem, a directional backlight system using a single layer of decentered lens array has been proposed, but the crosstalk level is not low enough [22]. In this paper, we propose an autostereoscopic display system using a curved lens array to reduce the crosstalk level. Additionally, improvement of image quality and a lower crosstalk level are achieved by a lens array composed of trapezoid elemental lenses.
使用偏心透镜阵列的具有时分复用定向背光的自动立体显示器
DOI：
--
发表时间：
2019
期刊：
影响因子：
--
作者：
Borjigin;G. and Kakeya;H.
通讯作者：
H.
[论文] 基于子像素狭缝控制的时分四重视差屏障
影响因子：
1.1
作者：
Kakeya;H.;Okada;K.;and Takahashi;H.
通讯作者：
H.