KR101961041B1 - Liquid Crystal Display device using optical sheet combination for bright enhancing and composite sheet for liquid crystal display - Google Patents

Abstract

The present invention relates to a high-luminance film comprising a YAG-base phosphor and a LuAG-base phosphor in a base film; And a viewing angle supplement sheet. [0002] The present invention relates to a liquid crystal display device and a composite sheet for a liquid crystal display device using the combination of brightness enhancement optical sheets.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display (LCD) and a liquid crystal display (LCD)

The present invention relates to a liquid crystal display using a combination of brightness enhancement optical sheets, specifically, a combination of a brightness enhancement optical sheet capable of improving brightness of an LCD using a YAG and LuAG fluorescent material as a film and securing a viewing angle using a diffusion sheet And a composite sheet for a liquid crystal display device.

In the past, 40-inch TVs were the mainstream, but now more consumers are buying 50-inch TVs and even 60-inch TVs. Recently, competition for the manufacture of displays with excellent luminance and color has been emerging as the size competition ends.

Particularly, a liquid crystal display (LCD) displays images using the optical characteristics of liquid crystal. Since a liquid crystal panel for displaying an image is a non-light emitting type device that does not emit light by itself, And a backlight unit (BLU) for supplying light to the light source.

The BLU functions to uniformly illuminate the display image on the back of the LCD, which can not emit light, so that the display image can be seen. These BLUs use direct-lit BLUs, which are a method of evenly arranging LED BLUs behind the LCD panel, and LED BLUs at left and right corners, which are used to uniformly distribute the light generated from the LEDs (Edge-lit BLU), which is a method of reflecting light onto a substrate, and edge-type.

Conventionally, a liquid crystal display device applies a brightness enhancement film to increase the contrast, and the brightness enhancement film can be attached to the backlight unit by a light shielding tape. A reflection type polarizing film is used as a brightness enhancement film. The reflection type polarizing film is a film in which a high refractive index layer and a low refractive index layer are alternately repeatedly laminated. Commercially, DBEF (Dual Brightness Enhancement Film) of 3M Company is used.

Conventional LCD TVs using conventional brightness enhancement films are formed in a structure as shown in Fig. A white LED layer, a diffusion plate, a prism sheet, a DBEF film, and a panel are stacked in this order from the bottom. That is, the light from the white LED is condensed through the prism sheet and the brightness is improved by passing through the DBEF film.

However, there has been a need to develop a new substitute because a material to replace the conventional brightness enhancement film has not been developed.

In order to solve the problems of the related art as described above, the present invention provides a liquid crystal display device and a composite sheet for a liquid crystal display device using a combination of a brightness enhancement optical sheet instead of a DBEF film.

Here, the combination of the optical sheets includes a high-luminance film including a phosphor.

It is a further object of the present invention to use a view angle supplement sheet together with a view angle to improve the brightness degradation at a specific viewing angle.

The present invention provides a liquid crystal display device and a composite sheet for a liquid crystal display device using a combination of a brightness enhancement optical sheet including a high luminance film and a viewing angle supplement sheet in combination with a YAG base phosphor and a LuAG base phosphor in a base film do.

The liquid crystal display device using the combination of brightness enhancement optical sheets of the present invention is characterized by further comprising a prism sheet above the high-brightness film.

Further, the viewing angle supplement sheet is characterized by being a lens film, MOP or diffusion sheet.

The amount of the YAG-base phosphor and the LuAG-base phosphor is 10 to 40 wt% for the YAG-base phosphor and 1 to 20 wt% for the LuAG-base phosphor relative to the entire coating layer.

Further, the thickness of the high-luminance film is 50 to 300 m.

In addition, YAG-base phosphor is _{Y 3 A1 5 0 12: Ce} 3 + (YAG: Ce), Tb 3 A1 5 0 12: Ce 3 + (TAG: Ce), Ca 3 (Sc, Mg) 2 Si 3 O 12 ^{_{: Ce 3+, Y 3 Mg 2}} AlSi 2 O 12: characterized in that the at least one of a Ce ^{+ 3.}

Also, LuAG base phosphor Lu ₃ Al ₅ O _12: characterized in that the at least one of a ^{Ce 3 +: Ce 3 +,} Tb 3 Al 5 O 12: Ce 3 +, Lu 2 CaMg 2 Si 3 O 12.

And a composite sheet having a high-luminance film and a viewing angle supplement sheet bonded together.

Further, the present invention is characterized by including a composite sheet on which a high-luminance film, a prism sheet and a viewing angle supplement sheet are adhered.

Further, the high-luminance film is characterized by including a back coating layer containing PMMA particles or PMMA particles and an antistatic agent.

The PMMA particles may be contained in an amount of 0.1 to 5 wt% based on the white coating layer.

The antistatic agent is contained in an amount of 0.01 to 3 wt% relative to the back coat layer.

The back coating layer has a thickness of 1 to 10 mu m.

The composite sheet for a liquid crystal display of the present invention is characterized in that, in the base film, a high luminance film including a YAG-base phosphor and a LuAG-base phosphor, a prism sheet and a viewing angle supplement sheet are sequentially laminated with an adhesive.

Further, the viewing angle supplement sheet is characterized by being a lens film, MOP or diffusion sheet.

The amount of the YAG-base phosphor and the LuAG-base phosphor is 10 to 40 wt% for the YAG-base phosphor and 1 to 20 wt% for the LuAG-base phosphor, compared to the entire coating layer.

The thickness of the coating layer is 10 to 100 m.

Further, the high-luminance film is characterized by including a back coating layer containing PMMA particles or PMMA particles and an antistatic agent.

When a combination of optical sheets of the present invention, that is, a combination of a high-brightness film including a phosphor, a prism sheet and a viewing angle compensating sheet is applied to an LCD instead of a DBEF film, luminance is improved with respect to an LCD TV using a conventional DBEF film This is possible.

1 is a schematic view showing a conventional liquid crystal display using a conventional DBEF.
Fig. 2 is a schematic view showing a liquid crystal display device (comparative example) when a phosphor and a prism sheet are used. Fig.
3 is a schematic view showing a liquid crystal display device using the phosphor, the prism sheet, and the viewing angle supplement sheet of the present invention.
4 is a schematic view showing a liquid crystal display device (Example 1) using a lens film.
5 is a schematic view showing a liquid crystal display device using MOP (Embodiment 2).
6 is a schematic view showing a liquid crystal display device (Embodiment 3) using a diffusion sheet.
7 is a view showing a structure of a (left) diffusion sheet and a (right) lens film.
FIGS. 8 to 10 show the results of measurement of the viewing angle of the LCD manufactured according to Examples 1 to 3 and Comparative Examples.
11 is a schematic diagram of a process for laminating a high-luminance film of the present invention and another optical film.

The present invention will be described in detail below, and the following embodiments or examples are for illustrative purposes only and the present invention is not necessarily limited thereto.

According to the present invention, the brightness of the LCD can be improved by using a high brightness film (HBF) 100 instead of the DBEF film. In addition, by using the view angle supplement sheet 14 together, have.

Specifically, according to a preferred embodiment of the present invention, the phosphor improves the luminance of the LCD using a high luminance film including both YAG (Yittrium aluminum garnet) -based phosphor emitting yellow fluorescence and LuAG (Lutetium aluminum garnet) -based phosphor.

And a view angle supplement sheet is applied to a high luminance film including the YAG-base phosphor and the LuAG-base phosphor to ensure a viewing angle.

Examples of the base film used in the present invention include PET, TAC, PC, polyimide, and acryl film.

In the present invention, the phosphors may be added to the base film in an appropriate ratio to add or include the phosphors in the base film.

In the present invention, YAG (Yittrium aluminum garnet) -based phosphors and LuAG (Lutetium aluminum garnet) -based phosphors that emit yellow fluorescence may be used together to improve the luminance and color reproducibility.

The YAG-base phosphor is _{Y 3 A1 5 0 12: Ce} 3 + (YAG: Ce), Tb 3 A1 5 0 12: Ce 3 + (TAG: Ce), Ca 3 (Sc, Mg) 2 Si 3 O 12: ^{_{Ce 3+, Y 3 Mg 2 AlSi}} 2 O 12: it is preferable that at least one of a Ce ^{+ 3.}

The LuAG base phosphor _{Lu 3 Al 5 O 12: Ce} 3 +, Tb 3 Al 5 O 12: Ce 3 +, Lu 2 CaMg 2 Si 3 O 12: it is preferable that at least one of a Ce ^{+ 3.}

YAG-base phosphor and LuAG-base phosphor are mixed at a ratio of 10 wt%: 1 wt% to 40 wt%: 20 wt%.

That is, the amounts of the YAG-base phosphor and the LuAG-base phosphor are 10 wt% to 40 wt% for the YAG-based phosphor and 1 wt% to 20 wt% for the LuAG-based phosphor.

If the lower limit value of the YAG-base phosphor is less than 10 wt%, the luminance improvement effect is insignificant. If the upper limit value is more than 40 wt%, the color reproduction rate, which is important in LCD TV, is lowered. Therefore, the YAG content is preferably in the range of 10 wt% to 40 wt%.

When the lower limit value of the LuAG phosphor is less than 1 wt%, the luminance improvement effect is insignificant. When the upper limit value is more than 20 wt%, the important color reproduction rate is lowered in the LCD TV, and thus the LuAG content is preferably in the range of 1 wt% to 20 wt% .

Improvement of luminance and color recall ratio according to the content of YAG-base phosphor and LuAG-base phosphor division Ref. DBEF
(LED TV) Ref. DBEF
( QD  TV) YAG  : Luag
content wt% YAG  10 YAG  10
Luag  5 YAG  10
Luag  10 YAG  10
Luag  20 Luminance [nit] 430 450 Luminance [nit] 430 450 500 550 X 0.2730 0.2593 X 0.2350 0.2406 0.2531 0.2749 Y 0.2925 0.2911 Y 0.2577 0.2701 0.2860 0.2970 Color Reproducibility [ % ] 81.6 100 Color Reproducibility [ % ] 81.3 81.8 82.4 82.6 division Ref. DBEF
(LED TV) Ref. DBEF
( QD  TV) YAG  : Luag
content wt% YAG  20 YAG  20
Luag  5 YAG  20
Luag  10 YAG  20
Luag  20 Luminance [nit] 430 450 Luminance [nit] 480 520 560 600 X 0.2730 0.2593 X 0.2550 0.2606 0.2731 0.2801 Y 0.2925 0.2911 Y 0.2877 0.2801 0.2910 0.2970 Color Reproducibility [ % ] 81.6 100 Color Reproducibility [ % ] 82.6 82.3 82.4 82.6 division Ref. DBEF
(LED TV) Ref. DBEF
( QD  TV) YAG  : Luag
content wt% YAG  40 YAG  40
Luag  5 YAG  40
Luag  10 YAG  40
Luag  20 Luminance [nit] 430 450 Luminance [nit] 540 550 580 620 X 0.2730 0.2593 X 0.2750 0.2980 0.3031 0.3349 Y 0.2925 0.2911 Y 0.2935 0.2966 0.3140 0.3422 Color Reproducibility [ % ] 81.6 100 Color Reproducibility [ % ] 81.3 81.2 81.4 81.6

The YAC-base phosphor and the LuAG-base phosphor are added into the base film to produce a high-luminance film (100).

The high-luminance film can be produced by uniformly dispersing the YAC-base phosphor and the LuAG-base phosphor in a dope and then casting the base film.

In the production of a base film to which the phosphor is added, a base film containing the phosphor can be produced without the need of separately coating the base film with a phosphor. When applying the base film containing the phosphor to an LCD, A film capable of improving luminance and color reproduction can be produced.

The thickness of the high-luminance film (100) is preferably from 50 mu m to 300 mu m. When the thickness is less than 50 탆, the luminance improving effect is insufficient, and when the thickness is more than 300 탆, the handling easiness in the manufacturing process of the liquid crystal display device is poor.

The prism sheet 3 may be used together with the high-luminance film 100 according to the present invention. This is shown in FIGS. 2-6.

In the conventional general LCD TV, the light emitted from the white LED 1 is first condensed through the prism sheet 3, and then the brightness is improved while passing through the DBEF film 4.

On the other hand, in the present invention, when the prism sheet 3 is used, the brightness of the light emitted from the blue LED 11 is improved while passing through the high-luminance film 100 including the phosphor first, do.

It is preferable that the prism sheet 3 is formed by laminating POP (Prism On Prism, two-piece composite film) or vertical and horizontal prism sheets.

Result of brightness check by HBF application position side Measurement structure
phrase #One #2 # 3 #4

Luminance [nit] 784.7 629.8 182.1 58.7

As shown in Table 2, when the high brightness film (HBF) 100 of the present invention is applied to the LCD, it is confirmed that the brightness enhancement effect is maximized when the prism sheet 3 is provided on the HBF.

Therefore, the prism sheet 3 can be used together with the upper layer of the high-luminance film 100.

In addition, when the HBF 100 is applied directly to the LED light source 11 and the light guide plate 12, the brightness enhancement effect is the best.

Therefore, it is most preferable to apply the HBF 100 between the LED light source 11 and the light guide plate 12 and the prism sheet 3 as shown in FIG.

In Table 3, the DBEF film (4) is removed, and the DBEF film is removed.

HBF has lower brightness when used without DBEF film and prism sheet but has higher brightness than DBEF film when used with prism sheet (3) instead of DBEF film and DBEF (4) film And the prism sheet 3, it exhibits a front luminance of 784.7 nit and a luminance of 8K UHD class or higher.

Optimization of application structure of HBF luminance enhancement film White LED TV ( UHD ) QD  TV ( SUHD ) HBF  + POP HBF  + POP + DBEF Measure
rescue

Front luminance 439nit 527nit 566nit 796nit Front X coordinate 0.272 0.258 0.253 0.280 Front Y coordinate 0.290 0.289 0.291 0.353

As shown in Table 4, it is preferable that HBF 100 alone is not included in the DBEF (4) film in view of satisfying luminance enhancement and frontal tallow allowance.

Luminance and color reproducibility, front tachometer, RGB tachometer comparison Product structure
( 55 inch  Same size) UHD  TV
(White-LED Direct type )
QD  TV
(Blue-LED Edge type )
Phosphor film
(Blue-LED Edge type )

Luminance 469.2 nit 523.3 nit 560 nit Front tallow X 0.2730 0.2593 0.2531 Y 0.2925 0.2911 0.2888 Color Reproducibility  [%] 81.6 100 82.4% R 0.6441 / 0.3377 0.6672 / 0.3187 0.6373 / 0.3405 G 0.3033 / 0.6167 0.2596 / 0.6642 0.2927 / 0.6243 B 0.1425 / 0.0573 0.1436 / 0.0541 0.1425 / 0.0572

Table 5 shows that the HBF 100 according to the present invention has the highest luminance, and it can be seen that the color reproducibility is higher than that in the case where the DBEF film is directly applied to the WHITE direct LED type.

The present invention can constitute a combination of brightness enhancement optical sheets using the viewing angle supplement sheet 14 together with the high brightness film 100 and can improve the brightness according to the viewing angle of LCD when using the combination of brightness enhancement optical sheets.

3, the combination of the brightness enhancement optical sheet may be formed by using the viewing angle supplement sheet 14 together with the high brightness film 100 and the prism sheet 3, It is possible to realize the luminance improvement according to the viewing angle of the display device. The light condensed through the prism sheet diffuses again in the viewing angle compensating sheet, thereby achieving a higher luminance and a higher luminance per view angle than the conventional LCD TV.

The viewing angle supplement sheet 14 includes a lens film 15, a micro lens on prism (MOP) 16, a diffusion film 17 on which a lens film capable of diffusing is stacked, Is preferable. This is shown in Figures 4-6, respectively.

The structure of the diffusion film and the lens film 15 is shown in Fig.

The micro lens on prism (MOP) 16 of the viewing angle supplement sheet 14 is effective for realizing a luminance improvement according to the viewing angle when the combination of the brightness enhancement optical sheet and the high brightness film 100 is formed.

However, unlike the other viewing angle compensating sheet, since the lens film capable of diffusing function is stacked on one layer of the prism, even if the brightness enhancing optical sheet combination is constituted without using the prism sheet 3 together, Effect.

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. It is to be understood that the following examples are for the purpose of illustration only, and are not intended to limit the scope of the invention.

Production Example - Production of High Brightness Film

890 Kg of a PET chip of Mw = 40,000 g / mol produced by a polymerization process was melted and 100 Kg of YAG fluorescent material (10 wt% of Resin) and 10 Kg of LuAG fluorescent material (1 wt% of Resin) were finely dispersed in the melted PET chip The PET film 100M was produced through a biaxially stretching process. The specific film-forming process is as follows.

890 Kg of PET Chip produced by the polymerization process was fed and melted. 100 Kg of YAG phosphor and 10 Kg of LuAG phosphor were precisely dispersed through a high-temperature mixer and then extruded in a T-die to obtain a molten PET chip in which the phosphor was precisely dispersed Melt PET Resin was discharged through a slit gap (300 μm) to form a sheet, and Melt Resin was rapidly quenched and hardened in a casting roll to produce a casting sheet. Thereafter, heat was applied to the casting sheet at 120 ° C. and longitudinal stretching was carried out using a roll speed incrementer (speed of 10 M / min). The both sides of the sheet were held in a clip and stretched by 110%, and while running at a speed of 10 M / min, PET film was wound up at 100M.

Example  One

A light guide plate, a high brightness film, a prism sheet, a lens film, and a liquid crystal panel were sequentially disposed in front of a blue LED to produce an LCD according to the present invention as shown in FIG.

Example  2

An LCD as shown in Fig. 5 was manufactured in the same manner as in Example 1 except that MOP was disposed instead of the prism sheet and the lens film.

Example  3

An LCD as shown in Fig. 6 was fabricated in the same manner as in Example 1, except that a diffusion sheet was disposed instead of the lens film.

Comparative Example

The LCD was manufactured in the same manner as in Example 1, except that the lens film was removed.

The viewing angles of the LCDs prepared according to Examples 1 to 3 and Comparative Example were measured, and the results are shown in Figs. 8 to 10, respectively.

The luminance and color reproducibility of a general white light source LCD and the LCD of FIG. 2 division Ref. DBEF Comparative Example (LED TV) Luminance [nit] 430 566 Color Reproduction [%] 81.6 82

As shown in Table 6 and Figs. 8 to 10, the front luminance of the general white light source LCD was 430 nits at maximum. In the case of the comparative example, when using a high-luminance film, the luminance was 566 nits as seen from the front, and the luminance was increased by about 32%.

However, in the comparative example, it can be seen that the luminance decreases at angles of -30 and +30 depending on the viewing angle.

Therefore, in order to solve the luminance lowering problem even in the viewing angle range of the specific angle, the viewing angle supplement sheet having the diffusion function is further applied as in the first to third embodiments.

As a result, it was confirmed that the luminance reduced at angles of -30 and +30 as in the comparative example is improved by applying the viewing angle compensating sheet. This is illustrated in Figures 8-10.

In the case of Fig. 4 in which a lens film is used, the luminance and color recall ratio according to the content of the YAG and LuAG-based phosphors used in the high- division YAG 10 YAG 20 YAG 40 LuAG 5 LuAG 10 LuAG 20 LuAG 5 LuAG 10 LuAG 20 LuAG 5 LuAG 10 Luminance [nit] 550 600 650 620 660 700 650 680 Color Reproduction [%] 81.8 82.4 82.6 82.3 82.4 82.6 82 81.5

As shown in Table 7, when the lens film is used together, it can be confirmed that the luminance is increased as compared with the case where only the high luminance film of Table 1 is used.

When DBEF and HBF are used together, luminance and color reproducibility according to the blending ratio other than the desirable phosphor blending ratio YAG: LuAG YAG 5 YAG: LuAG YAG 50 content wt% LuAG 5 LuAG 10 LuAG 20 content wt% LuAG 5 LuAG 10 LuAG 20 Luminance [ nit ] 380 390 430 Luminance [ nit ] 610 630 640 Color Reproduction [ % ] 79.3 79.3 78.3 Color Reproduction [ % ] 72.3 71.3 71.3

The present invention may further include a back coating on at least one of an optical film such as a prism sheet, a DBEF, a viewing angle supplement sheet (lens film, MOP, diffusion sheet), and a high brightness film.

By the particles included in the back coating, irregularities are provided on the back surface of the optical film to prevent blocking with other optical sheets to improve workability and to prevent static electricity caused by friction in the process.

The coating solution used for the back coating is composed of urethane acrylate oligomer, monofunctional monomer, photoinitiator, leveling agent, dispersant, and PMMA particles.

The PMMA particles are preferably contained in an amount of 0.1 to 5 wt% with respect to the entire back coating. When the amount is less than 0.1 wt%, sufficient irregularities can not be formed on the back surface of the optical film. When the amount exceeds 5 wt%, transmitted light loss due to a high haze occurs. Therefore, the haze of the back coating layer is adjusted to 1 to 20% .

An anti-static additive may be added to the back coat as needed. The surface resistivity can be controlled by adding the antistatic agent. The antistatic agent is preferably contained in an amount of 0.01 to 3 wt% based on the total amount of the back coat layer. When the content of the antistatic agent is less than 0.01 wt%, the surface resistance for preventing static electricity is insufficient. When the antistatic agent content is more than 3 wt%, an excessive amount of the antistatic agent is added excessively. As a result, an antistatic agent is added in an amount of 0.01 to 3 wt% 10 ¹⁰ to 10 ¹² Ohm / □. When the surface resistance is in the range of 10 ¹⁰ to 10 ¹² Ohm / □, it is possible to prevent the film from being damaged in the dynamic state, and there is an effect that the charging phenomenon immediately after charging is immediately attenuated.

Back coating can be done by bar coating or slot-die coating.

The thickness of the coating layer upon back coating is preferably 1 to 10 mu m. When the thickness is less than 1 占 퐉, sufficient irregularities are not formed on the back surface of the optical film, preventing blocking. On the other hand, when the thickness is more than 10 占 퐉, there is a problem of transmission light loss due to high haze.

The present invention can adhere a plurality of films constituting an LCD in the form of a composite sheet. That is, a high-brightness film (HBF) and other optical films are laminated with an adhesive to form a composite sheet, which can be applied to an LCD.

The optical film may be selected from at least one of a prism sheet, a DBEF, and a viewing angle supplement sheet (lens film, MOP, diffusion sheet).

The adhesive preferably uses a transparent adhesive (OCA), and can be bonded by direct bonding (full lamination) or air gap bonding. In particular, the direct bonding method has a lower yield compared to the air gap bonding method, but has the advantage of high visibility due to excellent optical characteristics and low power consumption.

The lamination is performed by the same process as shown in FIG. The optical film F1 is supplied through the first supply roller R1 and the high luminance film F2 is supplied through the second supply roller R2. The optical film F1 passes through the adhesive application roller R3 and is coated on at least one surface of the optical film with an adhesive A and is then joined to the high-luminance film F2 through the jersey roller R4 to form a composite sheet F3 ) Is completed.

When two or more optical films are selected and used, a high-luminance film and one optical film are first laminated by the above process, and then the remaining one optical film is sequentially laminated by repeating the above- To form a sheet.

The present invention relates to a method for manufacturing a high luminance film, a prism sheet and a viewing angle supplement sheet by repeating a lamination process of laminating a high luminance film (100) and a prism sheet (13) by a lamination process, To form a composite sheet. The composite sheet can be formed by applying an adhesive between the high-luminance film and the optical film. Specifically, when only a prism sheet is used as the optical film, a composite sheet can be formed by applying an adhesive between the high-luminance film and the prism sheet. When a prism sheet and a viewing angle compensating sheet are used in the optical film, a composite sheet can be formed by applying an adhesive between the high luminance film and the prism sheet, or between the prism sheet and the viewing angle compensating sheet.

In the case of the present invention, a composite sheet in which an adhesive is applied between the high-luminance film 100 and the prism sheet 13, and between the prism sheet 13 and the viewing angle supplement sheet 14 is formed.

When a lens film is used as the viewing angle supplement sheet 14, a composite sheet in which a high brightness film and a prism sheet, or a prism sheet and a lens film are coated with an adhesive to form a composite sheet can be formed.

When the MOP is used as the viewing angle supplement sheet 14, a composite sheet formed by applying an adhesive between the high luminance film and the MOP can be formed.

When the diffusing sheet is used as the viewing angle supplement sheet 14, a composite sheet can be formed by applying an adhesive between the high-brightness film and the prism sheet or between the prism sheet and the diffusing sheet.

When the composite sheet of the present invention is formed, it is preferable to form a back coating layer by performing back coating on a high luminance film.

How to measure luminance

The brightness and color reproducibility of the brightness enhancement film of the present invention were evaluated using a liquid crystal display and a BM-7FAST color luminance meter from Topcon. The liquid crystal display device actually used is UN55JS8500F (Samsung, 55-inch Blue-BLU), and its basic configuration is as follows. Edge-type blue-LED light source, light guide plate, POP film (Prism on Prism), viewing angle supplement sheet, and liquid crystal panel. In this apparatus, the high luminance film (HBF) of the present invention is placed between the light guide plate and the POP film to evaluate the luminance and color reproducibility. In the evaluation, the interval between the BM-7FAST apparatus and the liquid crystal display apparatus (UN55JS8500F) is kept constant at 50 cm.

1: White LED 2: Diffusion plate
3: prism sheet 4: DBEF film
5: liquid crystal panel 11: light source (Blue LED)
12: light guide plate 14: view angle supplement sheet
15: Lens film 16: MOP
17: diffusion sheet
100: High Brightness Film (HBF)
R1: first supply roller
R2: second supply roller
R3: Adhesive application roller
R4: Lap roller
R5: take-up roller
r: Guide roller
A: Adhesive
F1: Optical film
F2: High Brightness Film (HBF)
F3: Composite sheet

Claims (18)

Wherein the YAG-base phosphor is Ca3 (Sc, Mg) 2Si3O12: Ce3 + or Y3Mg2AlSi2O12: Ce3 +, and the LuAG-base phosphor is Lu2CaMg2Si3O12: Ce3 + Ce3 +, and the YAG-based phosphor is contained in an amount of 10 to 40 wt%, and the LuAG-based phosphor is contained in an amount of 1 to 20 wt% with respect to the entire high-luminance film.
The liquid crystal display device according to claim 1, further comprising a prism sheet on the upper layer of the high-luminance film.
The liquid crystal display device according to claim 1, wherein the viewing angle supplement sheet is a lens film, MOP, or diffusion sheet.
delete The liquid crystal display device according to any one of claims 1 to 3, wherein the thickness of the high-luminance film is 50 to 300 占 퐉.
delete delete The liquid crystal display device according to claim 1, comprising a composite sheet having a high luminance film and a viewing angle supplement sheet bonded together.
The liquid crystal display device according to claim 2, further comprising a composite sheet having a high luminance film, a prism sheet and a viewing angle supplement sheet interposed therebetween.
The liquid crystal display device according to claim 1, wherein the high brightness film comprises a back coating layer comprising PMMA particles or PMMA particles and an antistatic agent. [11] The liquid crystal display device of claim 10, wherein the PMMA particles comprise 0.1 to 5 wt% of the back coating layer. The liquid crystal display according to claim 10, wherein the antistatic agent comprises 0.01 to 3 wt% of the back coating layer. The liquid crystal display device according to claim 10, wherein the back coating layer has a thickness of 1 to 10 μm.
A high brightness film, a prism sheet and a viewing angle compensating sheet comprising a YAG-base phosphor and a LuAG-base phosphor are sequentially laminated in the base film with an adhesive, and the YAG-base phosphor is Ca3 (Sc, Mg) 2Si3O12: Ce3 + or Y3Mg2AlSi2O12: Ce3 + Wherein the LuAG-based phosphor is Lu2CaMg2Si3O12: Ce3 +, and the YAG-based phosphor is contained in an amount of 10 to 40 wt% and the LuAG-based phosphor is contained in an amount of 1 to 20 wt% with respect to the entire high-luminance film. 15. The composite sheet for a liquid crystal display device according to claim 14, wherein the viewing angle supplement sheet is a lens film, MOP or diffusion sheet. delete 15. The composite sheet for a liquid crystal display device according to claim 14, wherein the thickness of the high-luminance film is 50 to 300 mu m. 15. The composite sheet for a liquid crystal display device according to claim 14, wherein the high brightness film comprises a back coating layer comprising PMMA particles or PMMA particles and an antistatic agent.

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