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Backlight device and liquid crystal display device including the same

A technology of display equipment and equipment, applied in the directions of light guides, optics, optical elements, etc., can solve the problems of difficulty in having brightness and not being used effectively, and achieve the effect of improving the efficiency of light

Inactive Publication Date: 2006-05-17
NEC LCD TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] However, the liquid crystal display device 100 has a problem that since light exits the light guide 107 toward the front (that is, upward in FIG. 1 ) in the light transmission mode, most of the light is reflected downward at the lower surface of the chamfered prism sheet 106. , indicated by the arrow 112, resulting in extremely difficult to have sufficient brightness in the light transmission mode
[0020] A liquid crystal display device including the backlight device shown in FIG. 2 has a problem that, as shown in FIG. is effectively used in the light transmission mode, but when the light source 310 emits light having a luminance of 2100Cd, the light Lb reflected on the light reflection sheet 340 having a luminance of about 600Cd is not effectively used
This creates the problem that, when viewed vertically, such a luminous flux 220 as shown in FIG. 5 can be seen

Method used

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  • Backlight device and liquid crystal display device including the same
  • Backlight device and liquid crystal display device including the same
  • Backlight device and liquid crystal display device including the same

Examples

Experimental program
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no. 1 example

[0046] 6A is a sectional view of the liquid crystal display device 10 according to the first embodiment, and FIG. 6B is a top view of the light guide 7 included in the liquid crystal display device 10 .

[0047] As shown in FIG. 6A, the liquid crystal display device 10 is an external light reflection type liquid crystal display device, including: a liquid crystal layer 1, which includes liquid crystal; an upper polarizer 2, which is arranged on the liquid crystal layer 1; a lower polarizer 3, which is arranged Under the liquid crystal layer 1; the light reflecting polarizing plate 5, which is bonded to the lower surface of the lower polarizing plate 3 through the light scattering adhesive 4; the chamfered prism sheet 6, which is arranged under the light reflecting polarizing plate 5; the inverted prism type light guide 7, which is disposed under the chamfered prism sheet 6; a light reflection sheet 8, which is disposed under the light guide 7, for reflecting upward the light em...

no. 2 example

[0097] 7A is a sectional view of a liquid crystal display device 20 according to the second embodiment, and FIG. 7B is a top view of a light guide 7 included in the liquid crystal display device 20 .

[0098] Compared with the liquid crystal display device 10 according to the first embodiment, the liquid crystal display device 20 according to the second embodiment is designed to further include a light guide pipe 73 disposed adjacent to the light guide 7 . Parts or elements corresponding to those of the liquid crystal display device 10 according to the first embodiment have the same reference numerals, and operate in the same manner as corresponding parts or elements in the first embodiment, unless explicitly stated below.

[0099] The light guide 73 is disposed adjacent to the light guide 7 such that the light guide 73 is in contact with the left side of the light guide 7 among the four sides of the light guide 7, that is, on two sides extending parallel to the direction in wh...

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PUM

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Abstract

A backlight device (75) for a liquid crystal display device (10) comprises: a chamfered prism sheet (6); a light guide (7) arranged adjacent to the chamfered prism sheet (6); a light reflection sheet (8) with the light guide (7) Adjacent arrangement; and a light source (74) that emits light into the light guide (7); the backlight device is characterized in that the light guide (7) is formed on its first surface facing the light reflection sheet (8) There is at least one groove (71) for defining a light reflecting surface (712) which obliquely reflects the light provided from the light source (74) towards the chamfered prism sheet (6).

Description

technical field [0001] The present invention relates to a backlight device arranged on the backside of a display unit in a display device, and a liquid crystal display device including the backlight device. Background technique [0002] Liquid crystal display devices are classified into: a light transmission type liquid crystal display device in which light emitted from a backlight device is passed through a liquid crystal layer; a light reflection type liquid crystal display device in which external light entering a liquid crystal layer is reflected; and a combination type liquid crystal display device. A device having the structural features of a light transmissive type liquid crystal display device and a light reflective type liquid crystal display device, that is, it has: a first region in which light emitted from a backlight passes through a liquid crystal layer; and a second region in which External light entering into the liquid crystal layer is reflected. [0003] C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335
CPCG02B6/0038G02B6/0053G02B6/0056G02F1/1335
Inventor 坂本道昭马场正武羽田宽
Owner NEC LCD TECH CORP