51.3: Digital Driving of TN‐LC for WUXGA LCOS Panel

Abstract

In this paper, digital driving method of SCTN mode for LCOS panel is studied for 256 gray scale realization of WUXGA panel. It is found that the slow response time of nematic LC causes the discontinuity and non-linearity of gray scales. For a natural gray scale, a short falling time of nematic LC is required. By an improved LC material and on the appropriate driving conditions, continuous 256 grays have been realized.

6.4: Invited Paper: Fully Digital D‐ILA™ Device for Consumer Applications

“…The results for this are shown in Fig. 6 and demonstrate a big improvement over the results reported previously [5]. Furthermore, the high contrast and large number of sub frames allows subtle gray scale in the dark state to be accurately replicated.…”

“…Our approach is to use Nematic liquid crystal, which has relatively slow response time compared with its shortest driving pulse width. This approach using Nematic liquid crystal was reported by K.H Kang et al [5], but they did not achieve sufficient grayscale.…”

19‐4: Invited Paper: Digital Driving on Silicon Microdisplay for XR

“…Once the market share leader in flat panel display, plasma display panel (PDP), was a PWM display (7,8). Furthermore, LCoS considered digital PWM driving from the early generations (9)(10)(11)(12). Another wellknown PWM driving displays are µLED displays (4,13,14).…”

28.2: Optimization of an MTN Mode for All Digital LCoS Imager for Projection Application

“…The all-digital LCoS design developed by Aurora uses a pulse width modulation scheme to address the pixels. Consequently the modulation of the LC during a frame time can be significant and is very dependent on the response time of the LC [4]. Modulation during the frame must be controlled to minimize temporal artifacts.…”

“…By evening out the distribution of modulated states throughout the reflectance range, less repeated states where selected in the CLUT. A similar approach to improving the shape of the gray ramp was taken in work by Kang et al [4], however their LC mode required response time to actually by faster. Our efforts concentrated on slowing the response time which likely resulted in a smoother gray ramp through the reduction in the asymmetry of the rise and fall times of the LC.…”