P‐11: Improvement of 3‐D Crosstalk with Over‐Driving Method for the Active Retarder 3‐D Displays

Abstract

In this paper, we proposed the equation of the gray-to-gray 3D crosstalk in the field-sequential 3D displays for the first time.With the definition of the proposed 3D crosstalk, we analyzed the gray-to-gray 3D crosstalk under the normal driving condition of active retarder 3D (AR3D) we proposed previously. To suppress the gray-to-gray 3D crosstalk levels, we optimized the overdriving table of the image panel of AR3D prototype. By applying the over-driving method, it was clarified that the equation of the gray-to-gray 3D crosstalk which we proposed was matched very well with the actual images in 3D mode and that the ghost effects were greatly reduced. IntroductionFor the prosperous era of the 3D displays, various types of 3D Display technologies have been proposed [1]. 3D technologies are classified into two major categories of glasses and non-glasses types. Since the viewing position is much free in spite of the requirement of some special glasses, the glasses type 3D displays are pioneering the initial 3D market.Among the various glasses type 3D displays, a field sequential shutter glasses type 3D display with a LCD panel has been introduced [2]. In that technology, each even and odd frame corresponding to the left and the right images are bypassed into the left and right eyes by the sequential operation of the left and right eye shutters in glasses. Therefore, the 2D resolution can be conserved even in the 3D states. However, due to the slow response time and writing speed of the LCD panels, the shutter can be opened in a very short time interval, called the vertical blanking time, leading to poor brightness in 3D modes. Moreover, since the shutter glasses needs batteries to make its active operation, they are still heavy, uncomfortable, and may have some malfunction due to the synchronization of the image panel and the shutter glasses. To overcome these disadvantages, we previously suggested the active retarder 3D (AR3D) technology as a fieldsequential 3D displays [3].In these types of field-sequential 3D displays, the major factor for the clear separation between left and right images is the response time of liquid crystal for the image panel. However, because of different response times in each gray-togray transition, the left and right images can not be clearly separated under some gray transitions showing the slow response time. Moreover, it has not been reported yet to describe quantitatively the gray-to-gray 3D crosstalk (GtoG 3D CT) for such an area of field-sequential 3D technology.In this paper, we first define the equation of the GtoG 3D CT in the field-sequential 3D displays and analyze the individual crosstalk level under normal driving condition of AR3D. To suppress the GtoG 3D CT, we optimize the overdriving table of the image panel of our prototype and then compare the results with the 3D CT levels under normal driving condition. Finally, by comparing the 3D CT values with observed images in 3D mode, we verify the equation of the GtoG 3D CT is suitable to describe characteristics of the ghost wh...

Measuring 3D crosstalk uniformity and its influence on contrast ratio

“…A more realistic indication of this dependence is given by the increase in the area average crosstalk, its standard deviation, and the maximum crosstalk. Some researchers have suggested other variations of the crosstalk equation to make it more perceptually relevant and have generalized the crosstalk characterization to between gray levels . These alternate formulations can still be represented on a 2D uniformity map and summarized in a manner similar to Table .…”

“…Some researchers have suggested other variations of the crosstalk equation to make it more perceptually relevant and have generalized the crosstalk characterization to between gray levels. 7,[11][12][13][14][15][16][17] These alternate formulations can still be represented on a 2D uniformity map and summarized in a manner similar to Table 1. The summary parameters can be used to help define the viewing conditions where a minimum level of image quality can be maintained.…”

Analysis of the Motion Picture Quality of Stereoscopic Three-dimensional Images

“…Therefore, in this case, the hold time of 3D images will be 1/60 s. The second one is an developing technology which is called active retarder. This method uses 120 Hz time-sequential driving to switch the left-eye and right-eye image every 1/120 s. Synchronized with the switching of images, the polarization of the entire screen is also changed by the active retarder to enable the observer to see the displayed image only by a single eye in each frame [9]. Therefore, the hold time of 3D images will be 1/120 s in active retarder technology.…”

A study on the perceptual relevance of crosstalk equations for stereoscopic displays

“…However, with the introduction of 3D televisions, new artifacts are introduced, for instance, interocular crosstalk, which degrade the viewing experience. According to the study of Meesters et al ., crosstalk is probably one of the main perceptual factors contributing to image quality degradation and visual discomfort, and many works have already been performed on the characterization of crosstalk …”

“…However, crosstalk in some displays (especially time‐sequential stereoscopic displays) has been found to be nonlinear and nonadditive . Therefore, a matrix with several gray‐level (GL) transitions has been proposed for crosstalk evaluation . This matrix indicates variations in the crosstalk level as a function of the GL combinations, but the correlation with the amount of perceived crosstalk is not always confirmed.…”