| ABSTRACT:Three-dimensional (3D) stereoscopic display with its display more immersive experience than the traditional two-dimensional perspective (2D), getting to be more widely studied and applied, will become an important development direction of display technology in next generation. Based on FFS mode LCD panel, some of the key technologies of3D display were studied.For shutter glass (SG)3D display device, based on the bottleneck-response time issue that FFS mode LCD panel was restricted to use in SG3D, a fast response FFS mode LCD panel was designed and prepared, and the SG3D display device was successfully prepared by this panel in the paper. For the upgrade of response time in FFS mode liquid crystal (LC) panel, the optimized pixel design, design of fast response LC material, and low cell gap have been mainly studied. By the simulation of pixel, the optimal conditions with2nd ITO pitch:8μm, Slit width:2.7μm, slit angle:11°, and cell gap being reduced from3.55μm to2.8μm were selected. Combined with the optimization of pixel structure, the design of fast response LC material with a low viscosity (γ1), high elastic constant (k2) and a high optical anisotropy (Δn), the drive voltage remained substantially constant, however, gray to gray response time (GTG RT) reduced from7.43ms to4.48ms. Compared to that of traditional LC, the panel transmittance of fast LC was improved by15.6%at the same cell gap. Meanwhile, the shift of white color and corrected color temperature (CCT) was controled. Further, SG3D display device was prepared by the use of fast response FFS mode LC panel. The3D crosstalk reached3.7%. Moreover, when cell gap was adjusted from2.8μm to2.6μm, optimized GTG response time reached3.18ms, and3D crosstalk was3.33%, which meaned3D display perspective has been further improved. Meanwhile, the influence of retardation on the LC light efficiency and CCT in the FFS mode was studied:LC light efficiency improves about3%, and the CCT reduces about800-900K with the increase of retardation per10nm in the range of260-350nm retardation.For patterned retarder (PR)3D display device, based on the issue that it is difficult to make an accurate assessment of3D view angle due to sensitive3D crosstalk at vertical direction, the PR3D view angle mechanism was analysed, and a theoretical model to derive an accurate estimation of3D view angle was established in the paper. Using this model, the PR3D vertical view angle, PR’s deviation, and the matching of PR and panel pixel based on FFS mode panel were studied. Compared to the traditional calculation method of3D view angle, the crosstalk, pixel aperture, optical interfaces refraction and other parameters were introducted, and a new estimation model of3D view angle was proposed to derive formulas. Experiments verified the effectiveness of estimation method. The influence of main panel parameters on3D vertical view angle in the PR3D display was systematically studied:3D view angle is proportional to BM width, pixel size, and the refractive index of the glass substrate and the polarizer, however, is inversely proportional to the thickness of the glass substrate and the polarizer. Reducing the thickness of the glass substrate is a proven method to enhance the3D perspective. Based on the new computing model, up and down3D view angles were derivated and validated when the deviation of PR attachment occured:3D view angle has shift up and down, the view angle shifts along the direction of PR deviation relative to pixel. The more dislocation has, the larger deviation of3D view angle is. However, the total3D view angle is essentially unchanged. Based on the new model, up and down3D view angles were derivated and validated when PR has a shrinkage design: PR with shrinkage design is conducive to converge up and down3D view angles to center, to achieve better3D effect. For PR3D display, the mechanism analysis and theoretical model establishment of3D view angle, has important reference value for vertically polarized stereoscopic3D display view angle and optimized panel design.For color image reproduction capacity of3D display device, a standard wide color gamut was also studied based on FFS mode LCD panel in this paper. The effect of spectrum on chromaticity was simulated and analysed, and the spectrums of LED backlight and color filter were adjusted and optimized. By using the LED backlight with RG phosphor matching the new color filter, when the thickness of color filter was selected2.2μm, NTSC color gamut of FFS mode3D display device increased from65.3%to74.9%, sRGB matching rate updated from83.2%to100%, achieving a full coverage of the sRGB standard color gamut, and white light transmittance reached28.1%. Meanwhile, it was verified that the shift of spectrum peak position of backlight and color filter to the color purification direction, and spectrum’s half-width narrowing, were benefit to the color gamut. |
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