Byung-Hyuk Shin

Analysis of response‐time compensation for black‐frame insertion

— An impulsive driving technique has been widely adopted for the elimination of motion blur in LCDs. Although the problem of slow temporal response time is very well known for LCDs, the inherent motion blur of moving objects in hold-type displays has a more-serious impact on display performance. It is well known that even very fast LCDs with zero response time still suffer from the motion-blur artifact due to hold-type driving effects. However, a fast temporal response is also critical in order to maximize the blur-reduction effect even in the case of impulsive driving. In this paper, the special behavior of LC molecules in an impulsive driving environment has been analyzed especially for the case of black-frame insertion, and we propose an effective means to implement optimized response-time compensation (RTC) for the black-frame insertion technique.

Advanced impulsive-driving technique for Super-PVA panel

Abstract— Super-PVA (S-PVA) technology developed by Samsung has demonstrated excellent viewing-angle performance. However, S-PVA panels can place extra demands on charging time due to the time-multiplexed driving scheme required to separately address two subpixels. Specifically, a 2G-1D pixel structure theoretically requires subpixel charging in one-half of the time available for a conventional panel. In this paper, a new LCD driving scheme, super impulsive technology (SIT), is proposed to improve motion-blur reduction by driving an S-PVA LCD panel at 120 Hz. The proposed scheme allows a 120-Hz 2G-1D panel to be driven with an adequate charging-time margin while providing an impulsive driving effect for motion-blur reduction. Considering that the cost of a 2G-1D S-PVA panel is comparable to that of a conventional 60-Hz panel, this method achieves good performance at a reasonable price. The detailed algorithm and implementation method are explored and the performance improvements are verified.

P‐44: Adaptive Threshold Overdriving Scheme for Improved LCD‐TV Noise Performance

This paper proposes an adaptive threshold overdriving algorithm to avoid exacerbating noise problems in LCD-TVs. In conventional LCD-TVs, video image noise is boosted by the timing controllers overdrive function, resulting in harsh noise as perceived by the human visual system. Various gray data and noise levels have been analyzed, and the conditions which generate the boosted noise have been extracted and applied to a new algorithm to adjust overdrive threshold criteria according to the input images. The new overdriving scheme shows greatly improved noise performance compared to conventional fixed threshold schemes.

P-56: Automatic Delay Compensation for a CCFL Backlight System

Recently, a single phase driving method has been adopted for driving CCFL lamps to provide a low cost implementation. However, high voltage driving signals are coupled to pixel electrodes through parasitic capacitance between the lamps and panel electrodes, generating artifacts in the display. This paper describes the analysis results of this phenomenon and the proposed automatic delay compensation scheme eliminates the artifacts caused by the coupling effect.