Illumination device and liquid crystal display device
A technology for lighting devices and liquid crystal panels, applied in static indicators, light guides of lighting systems, instruments, etc., can solve the problems of low reproducibility of concave and convex parts, inconsistent mold quality, increased manufacturing costs, etc., and achieve the effect of improving display quality.
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no. 1 example
[0051] Figure 5 It is a schematic diagram of a liquid crystal display using the lighting device according to the first embodiment of the present invention. Such as Figure 5 As shown, the liquid crystal display includes: a liquid crystal panel 50 , and a backlight 60 disposed on the back of the liquid crystal panel 50 .
[0052] The liquid crystal panel 50 is formed by sealing a liquid crystal 52 between two transparent substrates 51a and 51b. Polarizing plates (not shown) are provided on both sides in the thickness direction of the liquid crystal panel 50 . The size of the liquid crystal panel 50 is, for example, 2 to 4 inches.
[0053] The backlight 60 includes a plurality of light emitting diodes (LEDs) 61 as light sources, a light guide plate 62 , a reflection sheet 63 and a prism sheet 64 . The LED 61 is provided along one end surface of the light guide plate 62 .
[0054] The light guide plate 62 is made of transparent resin such as polymethyl methacrylate (PMMA), ...
no. 2 example
[0070] The first embodiment has been described by describing the case where the concave-convex pattern is optimized by means of the Gerchberg-Saxton algorithm or the simulated annealing algorithm to design the concave-convex pattern of the DOE. However, depending on the mold (via Figure 4 The mold manufactured by the method shown) data of the current concave-convex pattern to design the binary concave-convex pattern of DOE. This method will be described below.
[0071] Figure 15A to Figure 15C It is a schematic diagram of a method for designing a binary concave-convex pattern according to the current concave-convex pattern of the mold.
[0072] First, use a three-dimensional shape measuring device to measure the current concave-convex pattern of the mold. Figure 15A The concave-convex pattern of the mold in which the concave-convex pattern was formed by blowing treatment is shown. Next, based on the measurement results of the three-dimensional shape measuring device, es...
no. 3 example
[0078] Figure 16A It is a plan view of a light guide plate for an illuminating device for a liquid crystal display according to a third embodiment of the present invention. Figure 16B is a perspective view of a DOE placed on an end surface of a light guide plate. This embodiment is different from the first embodiment in the structure of DOE. Other elements are basically similar to those of the first embodiment, so descriptions of similar parts are omitted.
[0079] According to the present embodiment, the DOE 82 a for generating high-order diffracted light (high-order) is formed on the end surface of the light guide plate 82 . The DOE 82a that generates the higher-order diffracted light is composed of a one-dimensional diffraction grating concavo-convex pattern so that the diffracted light has anisotropy. The one-dimensional diffraction grating concave-convex pattern is determined by optimizing the concave-convex pattern using, for example, a Rigorous Coupled-Wave Analysi...
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