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Illumination device and liquid crystal display device

A technology of lighting device and light guide plate, applied in the field of lighting device and liquid crystal display device

Inactive Publication Date: 2012-09-26
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The light guide plate described in Patent Document 2 has the following problem: Since the cylindrical lens is arranged on the side of the light-emitting surface, the light incident from the light source into the light guide plate It emits to the liquid crystal panel side without sufficiently diffusing into the light guide plate, thus degrading the brightness distribution characteristics

Method used

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  • Illumination device and liquid crystal display device
  • Illumination device and liquid crystal display device
  • Illumination device and liquid crystal display device

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Experimental program
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no. 1 approach

[0058] Figure 6 It is a schematic diagram showing the lighting device and the liquid crystal display device using the lighting device according to the first embodiment of the present invention. as it should Figure 6 As shown, the liquid crystal display device of the present embodiment includes a liquid crystal panel 50 and a backlight (illumination device) 60 disposed on the rear side of the liquid crystal panel 50 .

[0059] A liquid crystal panel 50 is formed by sealing a liquid crystal 52 between two transparent substrates 51a and 51b. In addition, on the front side of the liquid crystal panel 50 ( Figure 6 A polarizer 53a is arranged on the upper side in the center, and a polarizer 53a is arranged on the back side ( Figure 6 A polarizer 53b is arranged on the lower side in the middle). The size of the liquid crystal panel 50 is, for example, 2 to 4 inches.

[0060] The backlight 60 is composed of a plurality of LEDs 61 serving as light sources, a light guide plate...

no. 2 approach

[0067] Figure 10 It is a figure which shows the shape of the cylindrical lens provided on the light guide plate of the illumination device which concerns on the 2nd Embodiment of this invention. The difference between this embodiment and the first embodiment is that the shape of the cylindrical lens provided on the reflective surface side of the light guide plate is different, and the other structures are basically the same as the first embodiment, so the description is omitted and repeated with the first embodiment. part.

[0068] Such as Figure 8 As shown, in the light guide plate 62 of the first embodiment, the cylindrical lenses 65 and the boundary portions between the cylindrical lenses 65 all have a shape formed by a circle with a radius r. In contrast, in the light guide plate 62 of the second embodiment, as Figure 10 As shown, the cylindrical lenses 65 and the boundary portions between the cylindrical lenses 65 all have a shape formed according to an ellipse whos...

no. 3 approach

[0073] Figure 12It is a figure which shows the shape of the cylindrical lens provided on the light guide plate of the illumination device which concerns on 3rd Embodiment of this invention. The difference between this embodiment and the first embodiment is that the shape of the cylindrical lens provided on the reflective surface side of the light guide plate is different, and the other structures are basically the same as the first embodiment, so the description is omitted and repeated with the first embodiment. part.

[0074] Such as Figure 12 As shown, in the light guide plate of this embodiment, the cylindrical lenses 65 and the boundaries between the cylindrical lenses 65 are all formed along the sinusoidal curve of h=c(1+sin(x)). Also in this third embodiment, the boundary portion between the respective cylindrical lenses 65 is formed of a concave smooth curved surface, so the same effect as that of the first embodiment can be obtained.

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Abstract

An illumination device which is better in brightness distribution characteristics than a conventional device and a liquid crystal display device in which the illumination is installed are provided. [MEANS FOR SOLVING THE PROBLEMS] Cylindrical lenses (65) are set on a side of a reflective surface of a light guide plate (62) and concave bent surfaces are connected between these cylindrical lenses. Light output from an LED (61) and traveling into a light guide plate (62) is deflected to various directions at boundary portions of the cylindrical lenses (65). With this structure, a ratio of light reflected in a vertical (thickness) direction at the boundary portions of the cylindrical lens (65) to project to the outside of the light guide plate (62) is reduced, and the occurrence of uneven brightness steaks can be avoided. As a result, display quality of a liquid crystal display device is improved.

Description

technical field [0001] The present invention relates to an illuminating device in which one or more light sources are disposed near an end surface of a light guide plate, and a liquid crystal display device using the illuminating device. Background technique [0002] Liquid crystal display devices are thin, light, and consume little power, so they are widely used in electronic devices such as mobile phones and portable terminals (PDA: Personal Digital Assistant). A lighting device called a backlight is generally provided on a liquid crystal display device used in these electronic devices. [0003] figure 1 It is a schematic diagram showing an example of a conventional liquid crystal display device (transmissive liquid crystal display device). as it should figure 1 As shown, the transmissive liquid crystal display device is composed of a liquid crystal panel 10 and a backlight 20 , and the backlight 20 is arranged on the back side of the liquid crystal panel 10 . [0004]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13357G02F1/1335G02B6/00G02B3/06F21V8/00F21Y101/02
CPCG02B6/0046G02B6/0068G02B3/06G02B6/0025G02B6/0038G02B3/005G02B6/0073G02F1/1335G02B6/0001
Inventor 前田智司有竹敬和佐竹贵男藤原晋
Owner FUJITSU LTD