Lighting device and display device using the same
A technology of lighting device and light incident surface, which is applied in the parts of lighting device, lighting device, light guide of lighting system, etc., can solve the problems of increasing thickness and cost of lighting device, and difficulty in increasing the size of light guide sheet.
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Embodiment 1
[0032] with the help of Figure 2 ~ Figure 3 , Figure 5 , Figure 8 , Figure 10 , to describe this embodiment. figure 2 The shape of the light incident part 2a of the light guide body 2 is shown enlarged. As shown in the figure, a trapezoidal concave portion 2 b is provided on the light incident surface facing the light source 1 . The short side of the trapezoid is 0.2 to 0.6 mm, the long side is 1.0 to 1.2 mm, and the height is about 0.5 to 1.0 mm, and the optimum value varies depending on the light distribution characteristics of the light source 1 and the like. In addition, the paraboloid 2 d extends in a parabolic shape from the light emitting portion of the light source 1 along the light emitting direction. The curve of the paraboloid 2d is determined based on the focal position of the parabola forming the paraboloid 2d, and the focal position is approximately within a range of 0.5 to 0.7 mm in the horizontal direction from the light source 1 along the exit surfac...
Embodiment 2
[0041] exist Figure 4 Middle schematically shows the cross-sectional structure of the lighting device of this embodiment. with that described in Example 1 image 3 Compared with the structure of the prism, the difference lies in that the height of the lower prism is fixed, and the pitch becomes narrower as the distance from the light source 1 increases. Even if the height is designed to be variable as in Embodiment 1, depending on the thickness or size of the light guide 2, the height of the lower prism 5 may have to be extremely small. In the current mechanical processing, the controllable prism height limit is about 1 μm. When a height lower than this limit value is required, such as Figure 4 As shown, it is necessary to make the pitch variable. At this time, the prisms with a specific pitch interfere with the pixel pitch of the liquid crystal panel, and moiré may occur in a specific area, so careful design is required.
[0042] In addition, in this embodiment, the an...
Embodiment 3
[0044] Image 6 The middle part schematically shows a part of the structure of the lighting device of this embodiment. Image 6 The structure is the same as that described in Example 1 Figure 5 The difference in structure is: the upper prism 9 is not a triangular prism but a semicircular prism. In the case of a semicircular prism, the direction of scattered light does not become stepped compared to a triangular prism, and unevenness can be further reduced. If the central position of the semicircle is farther away from the light guide sheet 2, it becomes a design that emphasizes viewing angle, and if it is closer, it becomes a design that emphasizes brightness. In the present embodiment, the semicircle is made into a convex shape, but a similar effect can also be obtained in the case of a concave shape.
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Abstract
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