TW201411201A - Polarizer and liquid crystal display device - Google Patents

Abstract

The present invention relates to a polarizer and a liquid crystal display device. The polarizer includes a first protective layer, a second protective layer, a polarization base sandwiched between the first and second protective layers, and an adhesive layer. The adhesive layer is located at a side of first protective layer opposite from the side where the polarization base is adjacent. Microstructures are attached to the second protective layer at a side of the second protective layer opposite the side where the polarization base is adjacent.

Description

Polarizer and liquid crystal display device

The present invention relates to a polarizer and a liquid crystal display device using the same.

A liquid crystal display (LCD) is one of the most widely used flat panel displays. The liquid crystal display device includes two panels configured with field generating electrodes such as a picture element electrode and a common electrode, and a liquid crystal layer interposed therebetween. The liquid crystal display device displays an image by applying an electric field to the field generating electrode to generate an electric field in the liquid crystal layer, the electric field determining the orientation of the liquid crystal molecules in the liquid crystal layer, thereby changing the polarization of the incident polarized light, and changing the transmittance of the liquid crystal display device. In order that the liquid crystal display device can display an image according to a change in transmittance.

Generally, a liquid crystal display device includes a liquid crystal panel and upper and lower polarizers attached to an outer surface of the liquid crystal panel to form polarized light and control the passage of light. Generally, the polarizer includes a release film, an adhesive layer, a first protective layer, a polarizing substrate, a second protective layer, and a surface protective film which are laminated in this order. Before attaching the polarizer directly to the liquid crystal panel, the release film is removed from the polarizer to attach the adhesive layer to the liquid crystal panel, and the surface protective film is removed after attaching the polarizer.

However, due to the surface reflection phenomenon of the polarizer, the utilization of light is lowered, and the brightness of the liquid crystal display device is lowered, and the display effect is poor.

The present invention provides a polarizer that can improve the brightness of a liquid crystal display device.

The present invention also provides a liquid crystal display device having a higher light exiting brightness.

A polarizer comprising a first protective layer, a second protective layer, a polarizing substrate sandwiched between the first and second protective layers, and an adhesive layer. The adhesive layer is disposed on a side of the first protective layer facing away from the polarizing substrate. A side of the second protective layer facing away from the polarizing substrate is provided with a microstructure for collecting light.

A liquid crystal display device comprising a liquid crystal panel and a backlight module, the liquid crystal panel comprising opposite first and second substrates, a first polarizer disposed on an outer surface of the first substrate, and an outer surface disposed on the second substrate The second polarizer. The backlight module is disposed adjacent to the second substrate. The second polarizer comprises a first protective layer, a second protective layer, a polarizing substrate sandwiched between the first and second protective layers, and an adhesive layer. The adhesive layer is disposed on a side of the first protective layer facing away from the polarizing substrate for attaching the polarizer to the surface of the liquid crystal panel. The second protective layer is disposed away from the side of the polarizing substrate to provide a microstructure for collecting light.

Since the polarizer of the present invention is provided with a condensed microstructure on the side of the second protective layer facing away from the polarizing substrate, the reflective phenomenon of the surface of the polarizer is destroyed, and the polarizer can also converge the light-emitting angle of the liquid crystal display device, thereby increasing the light-emitting brightness. .

1 is a schematic view showing the structure of a polarizer according to a preferred embodiment of the present invention.

2 is a schematic view of a liquid crystal display device using the polarizer shown in FIG. 1.

Please refer to FIG. 1 , which is a schematic diagram of a polarizer according to a preferred embodiment of the present invention. The polarizer 24 includes a release film 241, an adhesive layer 242, a first protective layer 243, a polarizing substrate 245, a second protective layer 246, and a surface protective film 249 which are laminated in this order.

The polarizing substrate 245 is a high molecular polymer which is formed by dyeing and stretching a polyvinyl alcohol (PVA) film through various dichroic organic dyes to absorb dichroic dyes to form polarization properties. When light is incident on the polarizing substrate 245, its dichroic medium causes polarization of the passing light to generate linearly polarized light.

The material of the first and second protective layers 243 and 246 is triacetate (TAC), which has the characteristics of high strength, high light transmittance and heat and humidity resistance. The first and second protective layers 243 and 246 are respectively attached to the upper and lower sides of the polarizing substrate 245 to support and protect the moisture and air from entering the polarizing substrate 245. A side of the second protective layer 246 facing away from the polarizing substrate 245 is provided with a microstructure 247 for collecting light, which can converge the exit angle of the emitted light and increase the brightness of the light. In the present embodiment, the microstructure 247 is a prism structure. The microstructure 247 can also be an elliptical protrusion, a cavity or a spherical protrusion or the like.

The surface protection film 249 serves to protect the surface of the polarizing substrate 245 and increase the hardness, abrasion resistance and chemical resistance of the lower polarizer 24.

The adhesive layer 242 is a laminate sensitive adhesive for adhering the polarizer 24 to the outer surface of the second substrate 212 of the liquid crystal display device 2, which determines the adhesive properties of the polarizer 24. A plurality of diffusion particles are distributed in the adhesive layer 242, so that the polarizer 24 has a diffusion function at the same time.

The release film 241 is a one-side coated ruthenium-terminated ethylene terephthalate film (PET film) for protecting the adhesive layer 242 to maintain the cleanness and viscosity of the adhesive layer 242.

When the polarizer 24 is attached to the outer surface of a liquid crystal panel, the release film 241 needs to be peeled off to attach the adhesive layer 242 to the outer surface of the liquid crystal panel, and the polarizer 24 is removed after the attaching operation is completed. Surface protection film 249.

Since the second protective layer 246 is provided with the condensed microstructure 247, the reflective phenomenon on the surface of the polarizer can be destroyed, and the polarizer 24 can also converge the light angle, thereby increasing the brightness and improving the display effect.

Moreover, since a plurality of diffusion particles are distributed in the adhesive layer 242 of the polarizer, the polarizer 24 can have a diffusion function at the same time. The diffusion particles are mixed in the adhesive layer 242 of the polarizer 24, and an additional adhesive may be omitted to attach the diffusion particles to the polarizer 24, omitting an additional colloid coating step. Moreover, the use of the polarizer 24 having a diffusion function can reduce the use of the diffusion sheet of the backlight module in the liquid crystal display device, and at the same time simplify the assembly of the backlight module.

Please refer to FIG. 2, which is a schematic diagram of a liquid crystal display device using the above polarizer. The liquid crystal display device 2 includes a liquid crystal panel 21 and a backlight module 22 that supplies light to the liquid crystal panel 21. The liquid crystal panel 21 includes a first substrate 211, a second substrate 212, a first polarizer attached to an outer surface of the first substrate 211, and a second polarizer 214 attached to an outer surface of the second substrate 212. The second polarizer 214 is a polarizer having the above microstructure. The backlight module 22 is disposed adjacent to the second substrate 212 of the liquid crystal panel 21 .

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

2. . . Liquid crystal display device

twenty one. . . LCD panel

twenty two. . . Backlight module

211. . . First substrate

212. . . Second substrate

213. . . First polarizer

214. . . Second polarizer

twenty four. . . Polarizer

241. . . Release film

242. . . Adhesive layer

243. . . First protective layer

245. . . Polarized substrate

246. . . Second protective layer

247. . . microstructure

249. . . Surface protection film

twenty four. . . Polarizer

241. . . Release film

242. . . Adhesive layer

243. . . First protective layer

245. . . Polarized substrate

246. . . Second protective layer

247. . . microstructure

249. . . Surface protection film

Claims (10)

a polarizer comprising a first protective layer, a second protective layer, a polarizing substrate sandwiched between the first and second protective layers, and an adhesive layer disposed on the first protective layer facing away from the polarizing substrate One side is characterized in that: the second protective layer is disposed away from the side of the polarizing substrate and has a microstructure for collecting light. The polarizer of claim 1, wherein a plurality of diffusing particles are distributed in the adhesive layer. The polarizer of claim 2, wherein the polarizer further comprises a release film, the adhesive layer being located between the first protective layer and the release film, the release film protecting the adhesive layer Maintain the viscosity and cleanliness of the adhesive layer. The polarizer of claim 3, wherein the polarizer further comprises a surface protective film disposed adjacent to the microstructure. The polarizer of claim 1, wherein the microstructure is a prism structure. The polarizer of claim 1, wherein the microstructure is an elliptical protrusion, a cavity or a spherical protrusion. A liquid crystal display device includes a liquid crystal panel and a backlight module. The liquid crystal panel includes first and second substrates disposed opposite to each other, a first polarizer disposed on an outer surface of the first substrate, and an outer surface disposed on the outer surface of the second substrate. a second polarizer disposed adjacent to the second substrate, the second polarizer comprising a first protective layer, a second protective layer, a polarizing substrate sandwiched between the first and second protective layers, and an adhesive a layer of the adhesive layer disposed on a side of the first protective layer facing away from the polarizing substrate for attaching the polarizer to the surface of the liquid crystal panel, wherein the second protective layer is disposed away from the side of the polarizing substrate Concentrated microstructure. The liquid crystal display device of claim 7, wherein a plurality of diffusion particles are distributed in the adhesive layer. The liquid crystal display device of claim 7, wherein the microstructure is a prism structure. The liquid crystal display device of claim 7, wherein the microstructure is an elliptical protrusion, a cavity or a spherical protrusion.