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Condensing film for LCD backlight unit and LCD backlight unit using the same

A light-gathering film and backlight technology, applied in the field of light-gathering film, can solve the problems of high production cost of backlight components and increased volume of LCD devices, and achieve the effects of reducing production costs and simplifying the preparation process

Inactive Publication Date: 2009-09-23
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the increase in the number of laminated optical films makes it possible to improve the image quality, but this causes problems of high production cost of the backlight assembly and an increase in the volume of the LCD device.

Method used

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  • Condensing film for LCD backlight unit and LCD backlight unit using the same
  • Condensing film for LCD backlight unit and LCD backlight unit using the same
  • Condensing film for LCD backlight unit and LCD backlight unit using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A curable resin solution was prepared by dispersing 20 g of a bead-shaped PMMA polymer (refractive index: 1.49, average particle diameter 15 μm (micrometer)) in 100 g of a UV curable resin with a refractive index of 1.53. A lenticular lens and a light input unit were formed on the upper and lower surfaces of the PET film, respectively, by pouring a curable resin solution between a roll-type mold and a 125 μm (micrometer) thick PET film and curing the curable resin solution. Then, a reflection plane is formed at the protrusion of the light input unit by applying reflective ink on the protrusion.

experiment Embodiment 1

[0052] Each light-concentrating film prepared in Example 1 and Comparative Example 1 was laminated on a side-light light guide plate, using a BM7 (purchased from Nikon) configured in a goniometer, and measured according to the viewing angle in the vertical direction Brightness distribution. The experimental results are plotted in the figure, such as Figure 5 shown.

[0053] like Figure 5 As shown, it shows that the luminance of the light concentrating film of Comparative Example 1 suddenly decreases around the viewing angle of about ±20° (degrees), but the luminance of Example 1 shows a mild change around the viewing angle. As mentioned above, since hot spots appear due to sudden changes in brightness, the formation of hot spots can be reduced by using a light-condensing film, such as the light-condensing film in Example 1, which shows mild changes in brightness, which makes it possible to display images with excellent quality images.

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Abstract

There is provided a condensing film for an LCD backlight unit. The condensing film including a film unit; a light outgoing unit formed in an upper surface of the film unit; and a light ingoing unit formed in a lower surface of the film unit, wherein a light diffuser is included inside the condensing film. The condensing film may be useful to widen a viewing angle and prevent the formation of hot bands by improving luminance distribution characteristics of light emitted from the condensing film since the condensing film includes a light diffuser capable of diffusing the light.

Description

technical field [0001] The present invention relates to a light-condensing film for an LCD backlight assembly, and more particularly, to a light-condensing film for an LCD backlight assembly, which is designed for to resolve issues regarding narrow viewing angles and tropical formation. Background technique [0002] In general, a liquid crystal display (LCD) is a device that displays images through a process between an upper substrate having ordinary electrodes and color filters formed therein and a lower substrate having thin film transistors and pixel electrodes formed therein The liquid crystal material is injected, and the alignment of the liquid crystal molecules is changed by applying different potentials to the pixel electrode and the common electrode to form an electric field, and the light transmittance of the light passing through the rearranged liquid crystal molecules is controlled. [0003] LCDs have advantages of being small-scale produced and light in weight ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02
CPCG02B5/0278G02B5/0242G02B6/0053G02F2001/133607G02B5/0268G02F1/133607G02B5/02G02F1/1335
Inventor 金勍模朴光承金镇贤韩尚澈
Owner LG CHEM LTD