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Backlight unit and liquid crystal display device including the backlight unit

A technology of liquid crystal display device and backlight unit, which is applied in the directions of optical elements, light guides, optics, etc., and can solve the problems of reducing the brightness of light and the like

Active Publication Date: 2021-11-26
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the brightness of the light decreases

Method used

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  • Backlight unit and liquid crystal display device including the backlight unit
  • Backlight unit and liquid crystal display device including the backlight unit
  • Backlight unit and liquid crystal display device including the backlight unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0048] figure 2 is a perspective view of a liquid crystal display device according to an embodiment of the present invention. image 3 yes figure 2 An exploded perspective view of a liquid crystal display device. Figure 4 is along figure 2 The cross-sectional view taken from I-I' in .

[0049]refer to Figures 2 to 4 A liquid crystal display device according to one embodiment of the present invention includes a display panel 100 , a driving circuit portion for driving the display panel 100 , a backlight unit 300 , and a housing member.

[0050] The display panel 100 includes a lower substrate 110 , an upper substrate 120 and a liquid crystal layer interposed between the lower substrate 110 and the upper substrate 120 . The lower substrate 110 and the upper substrate 120 may be formed of glass or plastic.

[0051] The lower substrate 110 may have a size larger than that of the upper substrate 120 .

[0052] Accordingly, the flexible source film 220 may be attached to...

no. 1 approach

[0078] Figure 5 is a schematic cross-sectional view illustrating a first embodiment of a color conversion layer and an adhesive layer.

[0079] refer to Figure 5 , the liquid crystal display device includes a display panel 100 and a backlight unit 300 .

[0080] The backlight unit 300 includes a light source 310 , a light guide plate 330 , a green conversion layer 352 , an adhesive layer 360 and a prism sheet 372 .

[0081] The light source 310 may include a blue LED emitting blue light and a red LED emitting red light or may include a magenta LED emitting magenta light mixed with blue light and red light. The light source 310 is disposed on at least one side surface of the light guide plate 330 and emits light toward the side surface of the light guide plate 330 .

[0082] The light guide plate 330 converts light emitted from the light source 310 into a surface light source and transmits the light toward the display panel 100 . In the first embodiment of the present inv...

no. 2 approach

[0095] Figure 6 is a schematic cross-sectional view illustrating a second embodiment of a color conversion layer and an adhesive layer.

[0096] refer to Figure 6 , the liquid crystal display device includes a display panel 100 and a backlight unit 300 .

[0097] The backlight unit 300 includes a light source 310 , a light guide plate 330 , a mixed color conversion layer 358 , an adhesive layer 360 and a prism sheet 372 .

[0098] The light source 310 may include a blue LED emitting blue light. The light source 310 is disposed on at least one side surface of the light guide plate 330 and emits light toward the side surface of the light guide plate 330 .

[0099] The light guide plate 330 converts light emitted from the light source 310 into a surface light source and transmits the light toward the display panel 100 . In the second embodiment of the present invention, blue light may be incident on the light guide plate 330 from the blue LED. Accordingly, the light guide ...

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PUM

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Abstract

Disclosed are a backlight unit and a liquid crystal display device including the backlight unit. The liquid crystal display device includes: a display panel including red pixels, green pixels, and blue pixels; and a backlight unit emitting light to the display panel, wherein the backlight unit includes: a light source, The light source outputs light of a first color; a color conversion layer, which is arranged on the light source and converts the light of the first color into light of a second color; an optical sheet, which is diffused or converged by the optical sheet the second color light; and an air gap between the color conversion layer and the optical sheet.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2017-0144066 filed with the Korean Intellectual Property Office on October 31, 2017, the entire contents of which are hereby incorporated by reference into this application. technical field [0003] The invention relates to a backlight unit and a liquid crystal display device comprising the backlight unit. Background technique [0004] With the development of an information-oriented society, various demands for display devices that display images have increased. Therefore, recently, various flat panel display devices, such as liquid crystal display (LCD) devices, plasma display panels (PDP), organic electroluminescence display devices, are used. Among these flat panel display devices, the LCD device displays images by modulating light incident from a backlight unit by controlling an electric field applied to a liquid crystal layer. [0005] In su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13357
CPCG02B6/0053G02B6/005G02F1/133617G02F1/133615G02F1/133614G02B6/0061G02F1/133621G02F2202/28G02F1/1368G02B6/0088
Inventor 文彰悦朴济范朴世贤尹智洙李圭焕
Owner LG DISPLAY CO LTD