Liquid crystal display device
A technology of a liquid crystal display device and a liquid crystal layer, applied in nonlinear optics, instruments, optics, etc., can solve the problem of not improving the forward contrast, and achieve the effect of preventing the reduction of the front contrast
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[0081] Although the present invention is described based on examples, the present invention is not limited to the following examples. In addition, each measured value of the examples was measured by the following method.
[0082] [Measurement methods]
[0083] (Delay of Optical Compensation Element)
[0084] Measurement was performed with light having a wavelength of 590 nm at 23°C using a phase difference meter based on the parallel Nicol rotation method (product name 'KOBRA-WPR' manufactured by Oji Scientific Instruments). Measure the retardation when the film is tilted 40° in the front (normal) direction and the slow axis direction as the rotation axis, and calculate the direction of the maximum in-plane refractive index, the direction perpendicular to it, and the Respective refractive indices nx, ny, nz in the thickness direction. From these values and the thickness of the film measured using a direct-reading thickness gauge, in-plane retardation Re=(nx-ny)×d and thic...
manufacture example 1
[0092] (Production of backlight A)
[0093] Such as Figure 8 As shown schematically, a projection lens 2 and a dotted slit 3 (10mmφ) are set in front of a 100W metal halide lamp light source 1, and a mirror aluminum reflector 3 is set at the position where the light projected from there is reflected. An acrylic Fresnel lens 5 (diagonal 20 inches, focal length 40 cm) was arranged at the position where light was transmitted. In addition, a diffusion sheet 6 (haze 20%, half-diffusion angle 5°) was laminated on the front of the Fresnel lens 5 in order to hide the edge pattern of the above-mentioned Fresnel lens and eliminate uneven brightness in the plane. The backlight thus obtained is referred to as "backlight A". The half brightness angle of the backlight source A is 5°.
manufacture example 2
[0095] (Production of backlight B)
[0096] In Production Example 1 above, a light-concentrating backlight was produced in the same manner as in Production Example 1, except that a sheet having a haze of 40% and a half-diffusion angle of 10° was used as the diffusion sheet 6 . Let this backlight be "backlight B". The half brightness angle of the backlight B is 9°.
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