Wideband antireflective circular polarizer exhibiting a perfect dark state in organic light-emitting-diode display

Abstract

We proposed wideband antireflective circular polarizer for realizing a true black state in all viewing directions in organic light-emitting-diode displays (OLEDs). Present commercialized wideband circular polarizer consisted of a half wave and a quarter wave plates having the refractive index parameter (Nz) of 1.5 in both films exhibits light leakage in the oblique viewing directions, deteriorating image quality of a black state. We evaluated Nzs of both films and proposed a new wideband antireflective circular polarizer with a perfect dark state in all viewing directions with Nz = 0.5 in both plates, which will greatly improve image quality of OLEDs.

74‐1: Invited Paper: Can LCDs Outperform OLED Displays in Ambient Contrast Ratio?

“…For OLED, as mentioned earlier, a broadband circular polarizer is used [11]. Its optical configuration is plotted in Fig.…”

Design of an achromatic wide-view circular polarizer using normal dispersion films

“…The polarization state of light that has passed through the QWP depends on the wavelength because the phase retardation is inversely proportional to the wavelength of the incident light. Several approaches have been proposed to address this problem [5][6][7][8][9][10][11][12][13][14][15], and the so-called 'wide-band CP (WB-CP)' is widely used these days [6,7,[11][12][13]. In a WB-CP, the optical axis of a half-wave plate (HWP) and a QWP are ±15 and ±75°, respectively.…”

Single‐layered retardation films with negative wavelength dispersion birefringence made from liquid‐crystalline monomers

“…) and a broadband quarter‐wave plate (QWP), which is known as a retardation film (the red layer in Fig. ) . As shown in Fig.…”

“…1). 4 As shown in Fig. 1, incident light from an external source that passes through the linear polarizing plate is converted into left-handed (right-handed) circularly polarized light by the broadband QWP.…”