Twisted Nematic Dual-View Liquid Crystal Display Based on Patterned Electrodes

Abstract

This paper presents a dual-view (DV) liquid crystal display (LCD) fabricated with a twisted nematic (TN) cell that has patterned electrodes on its substrates. The TN DV LCD effectively inhibits the bright state light leakage in the un-intended viewing direction, improving the contrast ratio of the DV LCD when the right and the left subpixels of the DV LCD are addressed simultaneously. In the preferred viewing direction, the TN DV LCD has a high contrast ratio of 140:1.

Dual-View Blue Phase Liquid Crystal Display

“…The demonstrated DV BP LCD has a high CR (higher than 1000 in the intended viewing direction) and a low crosstalk. Furthermore, the proposed design effectively suppresses the low voltage optical bounce that is observed in previous works [11]- [13]. The operation mechanism and the obtained results are explained in the present paper.…”

“…In a DV BP LCD, the operation of a sub-pixel cannot disturb the operation of the other sub-pixel; that is, the light generated by LSP cannot leak to the right viewing direction. In previous works, the low voltage optical bounce is a kind of light leakage that results from the rotation of LCs, which creates a local transmittance maximum [11]- [13], [15]. In this paper, the direction of the electric field in a sub-pixel is parallel to the unintended viewing direction.…”

“…Furthermore, in this paper, the inclined electric field parallel to the unintended viewing direction provides the cell a low dark state and a low crosstalk in the unintended viewing direction. However, in our previous papers [12], [13], the function of the inclined electric field is to define the rotation directions of LCs in each subpixel of the DV LCD.…”

“…However, the optical bounce at low voltage is slightly increased. Notably, the previously demonstrated DV LCDs have low CRs less than 200, which is too low for practical applications [13].…”

“…However, the low CR (less than 100 in the intended viewing direction) and light leakage problems still remain unsolved. Using the twisted nematic with the patterned electrode cell slightly increases the CR and solves the bright state light leakage in the unintended viewing of the DV LCD [13]. However, the optical bounce at low voltage is slightly increased.…”