Light guide plate with translucent ink film, and backlight module and liquid crystal display device using the same

a technology of translucent ink film and light guide plate, which is applied in the direction of planar/plate-like light guide, lighting and heating apparatus, instruments, etc., can solve the problem of degrading the display quality of the display devi

Inactive Publication Date: 2006-12-28
INNOLUX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a light guide plate and a backlight module used in a liquid crystal display device. The light guide plate has a translucent ink film with pigment particles that help to guide light beams. The backlight module includes a light source and a reflective layer to enhance the brightness of the light beams. The technical effects of this invention include improved brightness and clarity of the display, reduced power consumption, and improved manufacturing process.

Problems solved by technology

The shift in the chromaticity may degrade the display quality of the display device employing the backlight module 100.

Method used

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  • Light guide plate with translucent ink film, and backlight module and liquid crystal display device using the same
  • Light guide plate with translucent ink film, and backlight module and liquid crystal display device using the same
  • Light guide plate with translucent ink film, and backlight module and liquid crystal display device using the same

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Experimental program
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Effect test

first embodiment

[0016]FIG. 1 is a schematic, side view of a light guide plate according to the present invention. The light guide plate 200 includes a substrate 230, and a translucent ink film 220 formed on the substrate 230. The substrate 230 includes an incident surface 233, an emitting surface 231, and a bottom surface 232. The emitting surface 231 and the bottom surface 232 are opposite to each other. The incident surface 233 adjoins the emitting surface 231 and the bottom surface 232. The translucent ink film 220 is formed on the emitting surface 231.

[0017] A thickness of the translucent ink film 220 is in the range from 1 mm to 100 mm, and it can be printed or coated on the substrate 230. The light guide plate 200 is typically made from polyethylene terephthalate (PET), polycarbonate (PC), or polymethyl methacrylate (PMMA). A base material of the translucent ink film 220 is translucent resin, which can for example be PMMA. The translucent ink film 220 includes a plurality of pigment particles...

second embodiment

[0019]FIG. 2 is a schematic, exploded, side view of a backlight module 300 incorporating a light guide plate according to the present invention. The backlight module 300 includes a first diffusion sheet 360, a brightness enhancement sheet 350, a second diffusion sheet 340, a light guide plate 330, a translucent ink film 320, and a reflection sheet 310 arranged in that order from top to bottom. The light guide plate 330 includes an emitting surface 331, a bottom surface 332, and an incident surface 333. The emitting surface 331 and the bottom surface 332 are opposite to each other. The incident surface 333 adjoins the emitting surface 331 and the bottom surface 332. The backlight module 300 further includes a light source 370 disposed adjacent to the incident surface 333 of the light guide plate 330. The first and second diffusion sheets 360, 340 and the brightness enhancement sheet 350 are two or three kinds of optical sheets.

[0020] The translucent ink film 320 is formed on the bott...

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Abstract

A light guide plate (200) includes at least one surface through which light beams pass, at least one translucent ink film (220) disposed on the at least one surface through which light beams pass, and the at least one translucent ink film includes a plurality of pigment particles (221). The pigment particles of the translucent ink film can absorb red light and green light, and thereby compensate for a shift in chromaticity that would otherwise occur in a backlight module due to absorption of blue light in the optical sheets of the backlight module. Therefore degradation of the display quality of the LCD is reduced or even eliminated.

Description

FIELD OF THE INVENTION [0001] The present invention relates to light guide plates, backlight modules that include a light guide plate, and liquid crystal display devices that include a backlight module. GENERAL BACKGROUND [0002] Conventionally, a liquid crystal display (LCD) device includes a backlight module, a liquid crystal panel, and a frame for accommodating the backlight module and the liquid crystal panel. The backlight module supplies light beams to the liquid crystal panel to display images. [0003]FIG. 5 is a schematic, exploded, side view of a conventional backlight module 100. The backlight module 100 includes a first diffusion sheet 160, a brightness enhancement sheet 150, a second diffusion sheet 140, a light guide plate 130, and a reflection sheet 110 arranged in that order from top to bottom. The light guide plate 130 includes an emitting surface 131, a bottom surface 132, and an incident surface 133. The backlight module 100 further includes a light source 170 dispos...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): A47F3/00
CPCG02B6/005
InventorHSU, YU-JUHSIEH, JUI-HUA
OwnerINNOLUX CORP