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Backlight unit

A technology of backlight and light source, applied in optical elements, optics, nonlinear optics, etc., can solve the problems of greatly reducing the brightness of the display surface, unable to correspond to the unit area with short side and long side, etc., and achieve the effect of uniformity

Inactive Publication Date: 2016-06-15
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, since the conventional directly below-type backlight unit is aimed at televisions and the like as liquid crystal display devices, each LED can divide the unit area of ​​the liquid crystal panel arranged directly below into a square, although such a square The unit area can uniformize the irradiated light, but cannot correspond to a unit area having a shape such as a rectangle with short sides and long sides, for example.
[0011] That is, in the conventional direct-type backlight unit, since the light emitted from the LED is isotropically diffused by the reflector, there is a possibility that the brightness on the short side of the display surface will be greatly reduced.

Method used

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Embodiment Construction

[0027] below, with Figure 1 A liquid crystal display device 1 as one embodiment of a device including the backlight unit of the present invention will be described first.

[0028] In addition, embodiment of this invention is not limited by embodiment mentioned below. In addition, as long as the problems can be solved, an embodiment in which a part of the embodiments described below is omitted is also an embodiment of the present invention. In addition, all conceivable forms are also embodiments of the present invention without departing from the essence of the present invention.

[0029]

[0030] like figure 1 As shown, the liquid crystal display device 1 is configured to include a liquid crystal panel 2 as a display panel section, an LED light source 3 as a light source, and a backlight unit 5 .

[0031] like figure 2 As shown in (a), the liquid crystal display device 1 of the present embodiment is installed together with gauges 11 such as a speedometer 11 a and a tac...

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Abstract

A backlight unit (5) according to one embodiment of the present invention, wherein an LED light source (3) is disposed directly below a liquid crystal panel (2), said backlight unit (5) comprises an anisotropic sheet (22) between the LED light source (3) and the liquid crystal panel (2). The anisotropic sheet (22), which transmits light emitted from the LED light source (3) and diffuses the emitted light towards the liquid crystal panel (2), has a structure which causes the emitted light to diffuse more widely in the direction along the long sides of a display surface in comparison to the direction along the short sides thereof. By providing this kind of anisotropic sheet (22), a reduction in brightness towards the short sides of the display surface can be suppressed with respect to light which radiates a unit area that is, for example, rectangular or the like.

Description

technical field [0001] This application is based on the JP Patent application 2013-228415 for which it applied on November 1, 2013, It takes in here by reference. [0002] The present invention relates to a backlight unit arranged on the back surface of a liquid crystal panel or the like. Background technique [0003] Currently, a liquid crystal display device including a backlight unit using an LED as a light source is widespread. There are two types of the backlight unit: a direct type in which LEDs are arranged directly under the liquid crystal panel, and an edge type in which LEDs are arranged on the edge side of the liquid crystal panel and light is guided to the liquid crystal panel by a light guide plate. [0004] Edge-type backlight units are often used in products that require thinner liquid crystal display devices (for example, smartphones, tablet terminals, etc.) to the extent that LEDs do not need to be placed directly under the liquid crystal panel. [0005] O...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357
CPCG02F1/133603G02F1/133606G02B5/0257G02B5/0278G02F1/133611G02B6/00G02F1/133605
Inventor 伊藤秀树
Owner DENSO CORP