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Problems solved by technology
However, applying ink uniformly to the end face of an extremely thin (approx. 60 μm) prism sheet significantly hinders the yield of the prism sheet
In addition, even if the ink can be applied, not only the reliability is poor, but also it cannot be practically applied in consideration of the problem of ink falling off after drying.
Method used
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Embodiment 1
[0055] figure 1 A part of the surface light source device 10 of the present invention is shown. The illustrated surface light source device 10 has a light guide plate 11 . When viewed from the front (upper in the figure), the light guide plate 11 has a rectangular or square quadrangular shape, through the back 12 located on the lower side in the figure, the front 13 located on the upper side in the figure, and four end faces connecting the back 12 and the front 13 And form the shape.
[0056] As shown in the figure, the thickness (width in the vertical direction) of the light guide plate 11 increases in the vicinity of the one end surface 14 . Specifically, the back surface 12 of the light guide plate 11 is formed by a flat surface. On the other hand, the front surface 13 of the light guide plate 11 is formed by a flat surface (circuit board supporting surface) 17 up to the first position (inclined start portion) 11 at a predetermined distance from the end surface 14. The ...
Embodiment 2
[0071] figure 2 Shows an example of the size of the structure arranged at the end of the surface light source device and the reason for its size limitation (refer to Figure 4 ).
[0072] Table 2
[0073] parts
Size (restriction reason)
A: End dead zone
5mm (determined by the final product)
B: Inclined surface
2mm (starting from the utilization efficiency of light, it cannot be shortened)
1mm (If it is shortened, it will cause poor fixation)
D: The surplus part of the light-emitting surface
0.5mm (when viewed obliquely, the edge of the prism sheet needs to be non-linear)
E, F: Clearance
0.2mm (necessary from the point of view of the processing accuracy of sheets, etc.)
[0074] From this Table 2 and Figure 4 It can be seen that the fixed width G of the light-shielding sheet 32 is 1.1 mm. In addition, considering the non-adhesive printing tolerance (±0.4mm) of the ...
Embodiment 3
[0077] As a light guide plate having an inclined surface, a light guide plate using a three-dimensional prism having a fan shape formed on an inclined surface can be used (see Nikkei Electronics, June 30, 2008). In this light guide plate with three-dimensional prisms, conical sector surfaces are formed in the region of the inclined surface, and a plurality of radial grooves (radial prism structure) are formed on each sector surface. In the case of using such a light guide plate formed with three-dimensional prisms, as Figure 7 , 8 As shown, it is also possible to form a protrusion 51 located between adjacent radial prism structures 50 at the end of the diffuser plate 26, and form a sticky portion only in the area corresponding to the protrusion 51 at the corresponding end of the light-shielding sheet 32. The adhesive portion 53 of the light-shielding sheet 32 is pasted and fixed to the protruding portion 51 . At this time, in order to prevent the entire end portion of the...
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Abstract
An area light source device (10) has, stacked on a light guide plate (11), a diffusion plate (26) and a prism sheet (27). Light (35) emitted from an area is obtained by introducing light emitted from a light source (23), which is placed facing an end surface (14) of the light guide plate, into the light guide plate from the end surface thereof and emitting the light, which is diffused in the light guide plate, from the diffusion plate and the prism sheet through a front surface (13) facing the diffusion plate. The light guide plate has a light guide section (16) including the end surface facing the light source, a light emitting section (21) facing the diffusion plate, and a connecting section (19) for interconnecting the light guide section and the light emitting section. The front surface of the connecting section has a sloped surface (20) extending from the light guide section to the light emitting section and gradually recessed toward the rear surface (12) on the opposite side of the front surface. The light guide section and the front surface of the connecting section are covered with a light shielding member (32). The light shielding member is fixed to the diffusion plate without the prism sheet provided therebetween, and air is present between the light shielding member and the sloped surface.
Description
technical field [0001] The present invention relates to a surface light source device used as a backlight device of a liquid crystaldisplay device. Background technique [0002] As a surface light source device, there is known an end-incidence type surface light source device, which has a surface light-emitting part in which a diffuser plate and a prism sheet are laminated on a light guide plate, and a light source arranged opposite to the end surface of the light guide plate, and emits light from the light source. The light is introduced into the interior from the end surface of the light guide plate, and the light diffused inside the light guide plate is emitted from the diffusion plate and the prism sheet, whereby surface emission is obtained. [0003] In addition, as an end surface incidence type surface light source device, Patent Document 1 proposes a structure in which a cross-sectional narrowing portion whose thickness becomes smaller as the distance from the incide...
Claims
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Application Information
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