Jong-Seo Lee

Recent Picture Quality Enhancement Technology Based on Human Visual Perception in LCD TVs

Picture quality enhancement technologies applied by human vision system (HVS) were introduced. A smooth eye pursuit mechanism was applied to moving picture quality enhancement. The fast frame-rate and impulsive-like driving methods were reviewed. A new analysis method of a color reproduction capability of TVs was introduced and had its importance pointed out. Luminance-related issues in liquid crystal display (LCD) TVs were reviewed, such as eye fatigue by high luminance and maximum perceptible contrast ratio of the display.

3.1: Advanced Motion Artifact Analysis Method for Dynamic Contrast Degradation Caused by Line Spreading

Moving Line Spreading is an advanced method for evaluation of motion artifacts for displays. It can show motion blur and dynamic contrast degradation in a single measurement. Human perception with regard to the amount of motion blur is not well-correlated to results from conventional motion blur analysis algorithms, since they do not account for the human visual system. We explore ways to make moving line spreading measurements and to validate the results with the human visual system for motion perception, as well as other methods of motion blur evaluation.

3.3: Edge Blur Width Analysis Using a Contrast Sensitivity Function

Motion blur edge width is obtained by using a contrast sensitivity function of eye. Correlation with an eye perceived blur edge width is improved. The improvement is large in the case of abnormal transition. We set a standard analysis condition of 8 deg/s velocity and 3H viewing distance. Measured blur widths are compared with a subjective test. This study is done to establish IEC standard method.

P-78: A Design Optimization of the OCB-Mode for the Application of Field-Sequential Color Microdisplays

Taking advantages of both low viscosity properties in LC mixture and the transient effects in Optically-Compensated Bend(OCB) cells, we have optimized the parameters of bend cells in order to get much faster optical response than conventional nematic modes. The optimized configuration features an on-off response time of less than 0.5 ms for a 2 micron cell driven by ±3.5 V, which is sufficiently compatible with existing electronics. Such a display as adopting this optimized device configuration is an outstanding candidate for the field-sequential color projection applications.

23.2: Optical Performance Analysis Method of Auto-stereoscopic 3D Displays

In this paper, we investigated performance analysis methods of auto-stereoscopic 3D displays in an optical point of view. This paper provides optical measurement and analysis methods for auto-stereoscopic displays. Issues discussed include: (1) optimum viewing distance; (2) luminance & contrast ratio; (3) color performance; (4) 3D point crosstalk; (5) spatial crosstalk; (6) ortho-stereoscopy angle/pseudo-stereoscopy angle; (7) luminance difference ratio.

17.2: Advanced Display Motion Induced Color Distortion and Crosstalk Analysis Methods

Motion artifact of Display devices has a huge interest from industries and users recently. Among those artifacts, color break up (CBU) and Dynamic false contour are the main degrading characteristic in field sequential type displays and Plasma Displays. Also, motion blur has been researched intensively recently, but there is a critical motion induced artifact due to phosphor or LC unwanted performance. This visual phenomenon is similar to normal crosstalk artifact, so it is named as motion crosstalk. Unfortunately, there are no objective measurement methods for those two motion-induced artifacts. Here we introduce advanced analysis methods for two different kinds of motion artifacts.

P-60: Novel Display Image Quality Analysis Based on Human Visual Perception

Picture quality analysis technologies considering on human visual perception (HVP) were introduced. Dynamic contrast analysis method in moving contents, color aberration analysis method, ghost image assessment method, and outdoor picture quality assessment method were researched and reviewed. The results from those analysis methods was correlated with human visual perception.