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Light intensity distribution conversion element, planar light source device, and liquid crystal display device

A technology of light intensity distribution and conversion elements, applied in optical elements, light sources, electric light sources, etc., can solve the problem of difficult to obtain high uniformity planar light, and achieve a wide color reproduction range, simple structure, and excellent uniformity. Effect

Active Publication Date: 2014-05-28
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, on the other hand, when a laser that is a point light source and emits light with high directivity is used as the light source of the surface light source device, it is difficult to obtain planar light with a highly uniform spatial light intensity distribution.

Method used

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  • Light intensity distribution conversion element, planar light source device, and liquid crystal display device
  • Light intensity distribution conversion element, planar light source device, and liquid crystal display device
  • Light intensity distribution conversion element, planar light source device, and liquid crystal display device

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Embodiment approach 1

[0039] figure 1 It is a diagram schematically showing the configuration of a liquid crystal display device 110 as a transmissive display device according to Embodiment 1 of the present invention. for easy figure 1 For the description, let the short-side direction of the liquid crystal optical element 1 be the Y-axis direction, let the long-side direction be the X-axis direction, let the direction perpendicular to the X-Y plane be the Z-axis direction, and let the display surface 1a side of the liquid crystal display element 1 be + Z-axis direction. In addition, let the upper direction of the liquid crystal display device be the +Y axis direction, and let the light emission direction of the first light source 6 described later be the +X axis direction. In each of the following figures, when the liquid crystal display device is viewed from the front, the left side is defined as the +X-axis direction.

[0040] Such as figure 1 As shown, the liquid crystal display device 110 h...

Embodiment approach 2

[0092] Figure 12 It is a diagram schematically showing the configuration of a liquid crystal display device 120 as a transmissive display device according to Embodiment 2 of the present invention. The liquid crystal display device 120 of the second embodiment is the same as the liquid crystal display device 110 of the first embodiment except that the surface light source device 220 is different from the surface light source device 210 . That is, the liquid crystal optical element 1 , the optical sheets 2 and 3 , and the light reflection sheet 5 are the same as those of the liquid crystal display device 110 of the first embodiment. The same reference numerals are assigned to the same components as those of the liquid crystal display device 110 described in Embodiment 1, and detailed description thereof will be omitted.

[0093] The surface light source device 220 of Embodiment 2 includes a light source 8 , a light intensity distribution conversion element 9 , and a light guid...

Embodiment approach 3

[0107] Figure 16 It is a diagram schematically showing the configuration of a liquid crystal display device 130 as a transmissive display device according to Embodiment 3 of the present invention. also, Figure 17 It is a configuration diagram showing the surface light source device 230 from the −Z axis direction. In liquid crystal display device 130 of Embodiment 3, surface light source device 230 is different from surface light source device 220 of Embodiment 2 in that it has first light source 10 instead of light source 8 and also has second light source 11 . That is, the liquid crystal optical element 1 , the optical sheets 2 and 3 , the light guide plate 4 , the light reflection sheet 5 , and the light intensity distribution conversion element 9 are the same as those of the liquid crystal display device 120 of the second embodiment. In addition, the components of the liquid crystal display device 120 of the second embodiment that are the same as those of the liquid cry...

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Abstract

A light intensity distribution conversion element (7) is provided with a light entry surface (7a), a light exit surface (7b), and total reflection surfaces (70a, 70b). The light entry surface (7a) allows entry of a light beam (6a) having directivity. The light exit surface (7b) has a curved surface portion (70c) for spreading the angular intensity distribution of the light beam (6a), the curved surface portion being concave-shaped with respect to the direction in which the light beam (6a) exits. The total reflection surfaces (70a, 70b) are near or adjacent to the curved surface portion (70c) and inclined with respect to the direction in which the light beam (6a) exits, and the light beam (6a) experiences total reflection at the total reflection surfaces. The light beam (6a), having experienced total reflection at the total reflection surfaces (70a, 70b), exits from the curved surface portion (70c).

Description

technical field [0001] The present invention relates to a light intensity distribution conversion element, a surface light source device, and a liquid crystal display device that have a laser as a light source and generate planar light with a uniform intensity distribution from point-like laser light. Background technique [0002] The liquid crystal display element itself included in the liquid crystal display device does not emit light. Therefore, the liquid crystal display device has a surface light source device as a light source for illuminating the liquid crystal display element on the back surface of the liquid crystal display element. Conventionally, cold-cathode fluorescent lamps have been mainly used as light sources of surface light source devices. The cold-cathode fluorescent lamp is a cold-cathode fluorescent lamp (hereinafter referred to as CCFL (Cold Cathode Fluorescent)) in which a phosphor is coated on the inner wall of a glass tube to obtain white light. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S2/00G02F1/13357F21Y101/02
CPCG02B6/0068G02B6/0031G02B6/0028G02B6/003G02B6/0053G02B6/0061G02B6/0025G02B27/0927
Inventor 西谷令奈中野菜美香川周一桑田宗晴小岛邦子
Owner MITSUBISHI ELECTRIC CORP