WO2012042803A1 - Liquid crystal display device - Google Patents

Abstract

This liquid crystal display device comprises: a light source(20) which is so arranged as to face a liquid crystal display panel (10) and can emit collimated light having a predetermined color; and a light color conversion section (30) which is arranged on the opposed side to the light source in the liquid crystal display panel and comprises multiple phosphor layers (31, 32) which can convert light of the light source into light having a different color and multiple light-scattering layers (33) which can scatter the light of the light source. The light color conversion section is provided with a reflection structure which reflects the light of the light source emitted around the phosphor layers so that the light can enter the phosphor layers and which reflects the light of the light source emitted around the light-scattering layers so that the light can enter the light-scattering layers. Because the present invention has the above-mentioned structure, the light entering areas around the phosphor layers and the light-scattering layers can enter the phosphor layers and the light-scattering layers, and therefore the efficiency of utilization of light of the light source can be improved.

Description

Liquid crystal display

The present invention relates to a liquid crystal display device including a light source that emits collimated light.

Generally, a liquid crystal display device is configured to perform color display by a combination of a white light source and a color filter. The color filter displays each color by selecting a wavelength of the light from the white light source and absorbing a part thereof. Therefore, the light transmittance of the light source is relatively low, and it is difficult to increase the light utilization efficiency.

On the other hand, for example, as disclosed in Patent Document 1, a phosphor and a scatterer are arranged on the front side (observer side) of the liquid crystal display device, and a part of the collimated blue light from the light source is displayed in blue as it is. In addition, a method is known in which a part of the image is converted into red and green by a phosphor and displayed. According to the liquid crystal display device of Patent Document 1, since the light from the light source is directly used, the light use efficiency of the light source can be increased.

However, in the liquid crystal display device of Patent Document 1, a part of the collimated light of the light source is blocked by the light shielding film provided between the phosphor and the scatterer, so there is a limit to further improving the light utilization efficiency. .

Therefore, in order to further increase the light use efficiency, in the liquid crystal display device disclosed in Patent Document 2, a condensing lens is disposed between the phosphor and the scatterer and the light source. That is, as shown in FIG. 15 which is a cross-sectional view of the liquid crystal display device 100, the liquid crystal display device 100 includes a light source 101 that emits collimated light, a wavelength conversion unit 102, and the light source 101 and the wavelength conversion unit 102. And a liquid crystal display panel 103 provided.

The liquid crystal display panel 103 includes a first substrate 106 on which a plurality of pixel electrodes 105 are formed, a second substrate 108 that is disposed opposite to the first substrate 106 and on which a common electrode 107 is formed, and the first substrate 106. And a liquid crystal layer 109 provided between the second substrates 108.

A polarizing plate 119 is attached to the surface of the first substrate 106 opposite to the liquid crystal layer 109. Further, a prism sheet 120 is laminated on the surface of the polarizing plate 119. On the other hand, a polarizing plate 121 is attached to the surface of the second substrate 108 opposite to the liquid crystal layer 109.

The wavelength conversion unit 102 includes a third substrate 111, a blue scattering layer 112, a red fluorescent layer 113, and a green fluorescent layer 114 formed on the liquid crystal display panel 103 side of the third substrate 111, the blue scattering layer 112, and the red fluorescent layer. A planarizing film 115 covering the layer 113 and the green fluorescent layer 114.

A plurality of condensing lenses 116 are provided on the surface of the planarizing film 115 so as to face the blue scattering layer 112, the red fluorescent layer 113, and the green fluorescent layer 114, respectively. Further, a reflective film 117 is formed between the blue scattering layer 112, the red fluorescent layer 113 or the green fluorescent layer 114, and the planarizing film 115.

In this way, the liquid crystal display device 100 causes the blue collimated light emitted from the light source 101 to enter the liquid crystal display panel 103, and the light transmitted through the liquid crystal display panel 103 is collected by the condenser lens 116 to be collected by the blue scattering layer 112. The red fluorescent layer 113 or the green fluorescent layer 114 is made incident.

JP 2000-131683 A JP 2010-66437 A

However, since the liquid crystal display device of Patent Document 2 has a plurality of condensing lenses, there is a possibility that the lens characteristics may change due to deterioration of the condensing lenses over time. For example, the condensing lens may be damaged or deformed by rubbing the condensing lens with other members such as a polarizing plate. As a result, the light collecting ability of the condensing lens is reduced, so that the light use efficiency is also reduced, and the luminance of the display light is reduced.

The present invention has been made in view of such points, and an object of the present invention is to use light of a light source without using a condenser lens for a liquid crystal display device having a light source that emits collimated light. Is to increase as much as possible.

In order to achieve the above object, the present invention is directed to a liquid crystal display panel, a light source disposed facing the liquid crystal display panel and emitting collimated light of a predetermined color, and opposite to the light source of the liquid crystal display panel. A liquid crystal display device including a plurality of phosphor layers arranged on the side and converting light of the light source into light of different colors, and a light color conversion unit having a plurality of light scattering layers that scatter light of the light source It is targeted.

The light color conversion unit reflects the light of the light source irradiated around the phosphor layer to enter the phosphor layer, while the light of the light source irradiated around the light scattering layer. The reflection structure part which reflects and injects into the said light-scattering layer is provided.

According to the present invention, a light source that emits collimated light, a plurality of phosphor layers that convert light from the light source into light of different colors, and a light color conversion unit that includes a plurality of light scattering layers that scatter light from the light source In the liquid crystal display device including the light source, the light color conversion unit reflects the light of the light source irradiated around the phosphor layer and causes the light to enter the phosphor layer, while the light color conversion unit reflects the light of the light source irradiated around the light scattering layer. Since the reflection structure portion that reflects light and enters the light scattering layer is provided, the light use efficiency of the light source can be increased as much as possible without using a condensing lens.

FIG. 1 is a cross-sectional view illustrating the structure of the liquid crystal display device according to the first embodiment. FIG. 2 is a cross-sectional view showing a chamber layer manufactured by an upper mold and a lower mold. FIG. 3 is a cross-sectional view showing a third reflective layer formed in a part of the chamber layer. FIG. 4 is a cross-sectional view showing a chamber layer in which a phosphor layer and a light scattering layer are formed. FIG. 5 is a cross-sectional view showing a chamber layer to which a cover substrate is attached. FIG. 6 is a cross-sectional view showing the chamber layer in which the first reflective layer is formed. FIG. 7 is an enlarged cross-sectional view of a part of FIG. FIG. 8 is a cross-sectional view showing a first mold on which the phosphor layer and the light scattering layer of Embodiment 2 are applied. FIG. 9 is a cross-sectional view showing the cover substrate onto which the phosphor layer and the light scattering layer have been transferred. FIG. 10 is a cross-sectional view showing a third reflective layer formed on the side surfaces of the phosphor layer and the light scattering layer. FIG. 11 is a cross-sectional view showing the chamber layer and the second mold. FIG. 12 is a cross-sectional view showing the chamber layer in which the first reflective layer is formed. FIG. 13 is an enlarged cross-sectional view showing the structure of the liquid crystal display device according to the third embodiment. FIG. 14 is an enlarged cross-sectional view showing the structure of the liquid crystal display device according to the fourth embodiment. FIG. 15 is a cross-sectional view showing the structure of a conventional liquid crystal display device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiment.

Embodiment 1 of the Invention
1 to 7 show Embodiment 1 of the present invention.

FIG. 1 is a cross-sectional view showing the structure of the liquid crystal display device 1 according to the first embodiment. FIG. 2 is a sectional view showing the chamber layer 36 manufactured by the upper mold 61 and the lower mold 62. FIG. 3 is a cross-sectional view showing the third reflective layer 43 formed on a part of the chamber layer 36. FIG. 4 is a cross-sectional view showing the chamber layer 36 in which the phosphor layers 31 and 32 and the light scattering layer 33 are formed.

FIG. 5 is a cross-sectional view showing the chamber layer 36 to which the cover substrate 53 is attached. FIG. 6 is a cross-sectional view showing the chamber layer 36 in which the first reflective layer 41 is formed. FIG. 7 is an enlarged cross-sectional view of a part of FIG.

As shown in FIG. 1, the liquid crystal display device 1 according to this embodiment includes a liquid crystal display panel 10, a light source 20 disposed to face the liquid crystal display panel 10, and a light source 20 on the opposite side of the liquid crystal display panel 10. The light color conversion unit 30 is provided. Then, the liquid crystal display device 1 selectively transmits light from the light source 20 through the liquid crystal display panel 10, and further converts a part of the color of the transmitted light into another different color in the light color conversion unit 30. Color light is output, and thereby, color transmissive display is performed.

(Configuration of LCD panel)
The liquid crystal display panel 10 is provided between a TFT substrate 11 on which a plurality of TFTs (thin film transistors: not shown) are formed, a counter substrate 12 arranged to face the TFT substrate 11, and the TFT substrate 11 and the counter substrate 12. Liquid crystal layer 13.

The TFT substrate 11 is an active matrix substrate, and includes, for example, a glass substrate 14 as a transparent substrate, the TFT formed on the surface of the glass substrate 14 on the liquid crystal layer 13 side, and a pixel electrode 15 connected to each TFT. is doing. The counter substrate 12 includes, for example, a glass substrate 16 as a transparent substrate, and a common electrode (not shown) provided in common to each pixel electrode 15 is formed on the glass substrate 16. The common electrode and the pixel electrode 15 are made of a transparent conductive film such as ITO (Indium Tin Oxide).

The glass substrate 16 is desirably thinned to a thickness of 0.1 mm or less in order to suppress the color mixture of light as much as possible, and further 0.05 mm or less makes it possible to achieve both the glass strength and the effect of preventing color mixing. preferable.

In the liquid crystal display panel 10, a plurality of pixels (not shown) arranged in a matrix are formed, and the TFT and the pixel electrode 15 are formed for each pixel. Although not shown, polarizing plates are respectively attached to the surface of the TFT substrate 11 opposite to the liquid crystal layer 13 and the surface of the counter substrate 12 opposite to the liquid crystal layer 13.

(Configuration of light source)
The light source 20 is configured to emit collimated light of a predetermined color. The light source 20 of this embodiment is configured by a backlight unit that emits blue collimated light. That is, as shown in FIG. 1, the light source 20 includes a light guide plate 21 that guides incident light, a plurality of point light sources (LEDs) 22 arranged opposite to the side surface of the light guide plate 21, and a light guide. And a prism sheet 23 provided on the liquid crystal display panel 10 side of the optical plate 21.

The LED 22 is, for example, a gallium nitride-based blue light-emitting diode, and exhibits an emission line-like emission spectrum having a half-value width of about 30 to 40 nm centered on a wavelength of 460 nm. The light guide plate 21 is for converting the light of the light emitting diodes into planar collimated light, and is formed of, for example, a transparent polycarbonate organic polymer material.

(Configuration of light color converter)
The light color conversion unit 30 includes a plurality of phosphor layers 31 and 32 that convert light from the light source 20 into light of different colors, a plurality of light scattering layers 33 that scatter light from the light source 20, and phosphor layers 31 and 32. And a chamber layer 36 as a support member for supporting the light scattering layer 33.

The chamber layer 36 is formed in a plate shape as a whole, and a plurality of through holes 35 are formed at predetermined intervals. The chamber layer 36 supports the phosphor layers 31 and 32 or the light scattering layer 33 in a state of being disposed inside the through hole 35. The chamber layer 36 is made of a transparent resin material such as a thermosetting resin, a thermoplastic resin, or a photocurable resin.

The phosphor layers 31 and 32 and the light scattering layer 33 are arranged so as to face each pixel of the liquid crystal display panel 10. The phosphor layer 31 converts the incident blue light of the light source 20 into red light and transmits it. On the other hand, the phosphor layer 32 converts the incident blue light of the light source 20 into green light and transmits it. The light scattering layer 33 scatters and transmits the blue light of the incident light source 20.

That is, the phosphor layers 31 and 32 are made of a transparent resin in which a fluorescent material that absorbs light in the blue light emission wavelength region of the LED 22 and emits red or green fluorescence is dispersed. On the other hand, the light scattering layer 33 is made of a transparent resin in which high refractive index particles such as barium titanate and silica filler are dispersed.

A third reflective layer 43 that is inclined with respect to the liquid crystal display panel 10 is interposed between the phosphor layers 31 and 32 or the light scattering layer 33 and the inner wall surface of the chamber layer 36 in the through hole 35. .

That is, the inner wall surface of the chamber layer 36 that forms the through-hole 35 has a circular cross section in a direction parallel to the liquid crystal display panel 10 and a cross section in a direction perpendicular to the liquid crystal display panel 10 on the viewer side. A pair of inclined surfaces is formed such that the distance gradually decreases from the upper side in FIG. 1 toward the liquid crystal display panel 10 side. That is, the inner wall surface of the chamber layer 36 forming the through hole 35 is constituted by the side surface of the truncated cone. And the said 3rd reflection layer 43 is comprised with the aluminum film vapor-deposited on this inner wall surface.

The phosphor layers 31, 32, the light scattering layer 33 and the chamber layer 36 are bonded to the cover substrate 53 via the first adhesive layer 51. The cover substrate 53 is made of the same material as the glass substrate 16 constituting the counter substrate 12 and the glass substrate 14 constituting the TFT substrate 11.

(Configuration of reflection structure)
Further, the light color conversion unit 30 reflects the light of the light source 20 irradiated around the phosphor layers 31 and 32 so as to enter the phosphor layers 31 and 32, and is irradiated around the light scattering layer 33. A reflection structure 40 that reflects the light from the light source 20 to enter the light scattering layer 33.

The reflection structure portion 40 is disposed on the surface of the chamber layer 36 on the liquid crystal display panel 10 side, and is disposed to face the first reflection layer 41, and transmits light from the light source 20. It has the 2nd reflective layer 42 which reflects the light irradiated from this light source 20 and the other side.

Further, the reflection structure 40 in the present embodiment is disposed between the phosphor layers 31 and 32 or between the phosphor layers 31 and 32 and the light scattering layer 33, and between the second reflection layer 42 and the chamber layer 36. And a partition wall 45 interposed therebetween.

That is, the surface of the chamber layer 36 on the liquid crystal display panel 10 side is formed as an uneven surface, and the first reflective layer 41 is formed by an aluminum film deposited on the surface. The surface of the first reflective layer 41 is formed in an uneven shape along the surface of the chamber layer 36. Therefore, the first reflection layer 41 has a reflection surface that reflects the collimated light emitted from the light source 20 so as to be directed toward the phosphor layers 31 and 32 or the light scattering layer 33 when viewed from the light source 20 side. ing. In addition, an aluminum film is formed on the surface of the chamber layer 36 opposite to the first reflective layer 41 in the same manner as the first reflective layer 41.

The second reflective layer 42 is composed of an antireflection film (AR (Anti Reflection) coating film) formed on the surface of the counter substrate 12 opposite to the liquid crystal layer 13.

The partition wall 45 is made of a metal material such as aluminum, and is formed in, for example, a lattice shape so as to surround the phosphor layers 31 and 32 or the light scattering layer 33 on the chamber layer 36. Thus, the side surface of the partition wall 45 is a reflecting surface that reflects light. Further, the partition wall 45 also functions as a light shielding film because it does not transmit the light from the light source 20.

Further, a second adhesive layer 52 is filled between the phosphor layers 31 and 32 or the light scattering layer 33 and the first reflective layer 41 and the second reflective layer 42. The refractive index of the second adhesive layer 52 is, for example, about 1.52, and is the same as the refractive index of the glass substrates 14 and 16 that are substrates constituting the liquid crystal display panel 10.

With the above configuration, the blue light emitted from the LED 22 is incident on the light guide plate 21 and is dimmed by the prism sheet 23 to be emitted from the light source 20 as collimated light. The blue collimated light emitted from the light source 20 enters the liquid crystal display panel 10 and is controlled so as to be selectively transmitted for each pixel. The blue collimated light transmitted through the liquid crystal display panel 10 is incident on the reflection structure unit 40 of the light color conversion unit 30 from the second reflection layer 42. The light transmitted through the second reflective layer 42 is reflected by the side surfaces of the first reflective layer 41, the second reflective layer 42, and the partition 45, and is guided to the phosphor layers 31 and 32 or the light scattering layer 33.

Blue light guided to the phosphor layer 31 is converted into red light and scattered, and a part of the blue light is emitted as it is to the viewer side through the cover substrate 53. The other light converted into red light is reflected by the inclined third reflection layer 43 and is emitted to the viewer side through the cover substrate 53.

On the other hand, the blue light guided to the phosphor layer 32 is converted into green light and scattered, and a part of the blue light is emitted as it is to the viewer side through the cover substrate 53. The other light converted into green light is reflected by the inclined third reflection layer 43 and is emitted to the viewer side through the cover substrate 53.

Further, the blue light guided to the light scattering layer 33 is scattered in the blue state, and a part thereof is emitted as it is to the viewer side through the cover substrate 53. The other blue light is reflected by the inclined third reflection layer 43 and is emitted to the viewer side through the cover substrate 53. In this way, color display is performed by the three primary colors of red, green and blue.

-Production method-
Next, a method for manufacturing the liquid crystal display device 1 will be described.

The liquid crystal display device 1 is manufactured by forming the light color conversion part 30 on the surface of the liquid crystal display panel 10 on the counter substrate 12 side, and then disposing the light source 20 to face the liquid crystal display panel 10.

First, the liquid crystal display panel 10 is manufactured by bonding a TFT substrate 11 and a counter substrate 12 that are manufactured in advance to each other through a liquid crystal layer 13 and a seal member (not shown). Polarizing plates (not shown) are respectively attached to the surfaces of the TFT substrate 11 and the counter substrate 12 opposite to the liquid crystal layer 13. Thus, the liquid crystal display panel 10 is manufactured.

Next, an AR coat is applied to the surface of the polarizing plate (not shown) of the counter substrate 12 to form the second reflective layer 42. Thereafter, the aluminum layer formed on the surface of the second reflective layer 42 is etched to form, for example, a lattice-shaped partition wall 45. The partition wall 45 is formed so as to surround each pixel when viewed from the normal direction of the surface of the counter substrate 12.

On the other hand, as shown in FIG. 2, a plurality of through-holes 35 are formed by introducing a transparent thermosetting or thermoplastic resin material into the upper mold 61 and the lower mold 62 assembled together. The plate-like chamber layer 36 is injection molded. The through hole 35 is formed such that the opening cross section gradually decreases from the upper mold 61 toward the lower mold 62. An uneven surface for forming unevenness on the surface of the chamber layer 36 is formed on a part of the surface of the lower mold 62.

When using a photocurable resin as the material of the chamber layer 36, at least one of the upper mold 61 and the lower mold 62 is made of a transparent material such as quartz glass or tempered glass such as PYREX (registered trademark of Corning). Consists of.

Next, as shown in FIG. 3, the upper mold 61 is removed, and an aluminum film is deposited on the surface of the chamber layer 36 remaining in the lower mold 62. At this time, a mask or the like is provided at the opening end on the lower mold 62 side of the through hole 35 so that the aluminum film is not deposited. As a result, the third reflective layer 43 is formed on the inclined surface of the chamber layer 36 in the through hole 35.

Next, as shown in FIG. 4, the phosphor layers 31 and 32 are applied to the chamber layer 36 on which the third reflective layer 43 is formed by, for example, an inkjet method or a nozzle method. Further, the light scattering layer 33 is applied to the chamber layer 36 by, for example, a nozzle method. Thus, the phosphor layers 31 and 32 or the light scattering layer 33 are formed inside the through hole 35.

Next, as shown in FIG. 5, the chamber layer 36 in which the phosphor layers 31 and 32 and the light scattering layer 33 are formed is transferred to the cover substrate 53. That is, the cover substrate 53 is attached to the surface opposite to the lower mold 62 of the chamber layer 36 supported by the lower mold 62 via the first adhesive layer 51. Thereafter, the lower mold 62 is removed from the chamber layer 36. The cover substrate 53 is formed of the same glass material as that of the glass substrates 14 and 16 constituting the liquid crystal display panel 10. The first adhesive layer 51 is made of a thermosetting or photocurable resin, and its refractive index is about 1.52, which is the same as that of the glass substrates 14 and 16.

Next, as shown in FIG. 6, an aluminum film is deposited on the surface of the chamber layer 36 bonded to the cover substrate 53 on the side opposite to the cover substrate 53. At this time, the phosphor layers 31 and 32 and the light scattering layer 33 are covered with a mask or the like. In this way, the first reflective layer 41 having an uneven shape along the uneven surface of the chamber layer 36 is formed.

Next, as shown in FIG. 1, with the second adhesive layer 52 filled between the partition walls 45, the chamber layer 36 on which the first reflective layer 41 is formed is attached to the partition wall 45. For the second adhesive layer 52, a thermosetting or photocurable resin having a refractive index of about 1.52 which is the same as that of the glass substrates 14 and 16 is applied.

Thus, the light color conversion part 30 having the reflection structure part 40 composed of the first reflection layer 41, the second reflection layer 42, and the partition wall 45 is formed. Then, the liquid crystal display device 1 is manufactured by disposing the light source 20 so as to face the liquid crystal display panel 10 on which the light color conversion unit 30 is formed.

-Effect of Embodiment 1-
Therefore, according to the first embodiment, the light source 20 that emits collimated light, the plurality of phosphor layers 31 and 32 that convert the blue light of the light source 20 into red light or green light, and the blue light of the light source 20 are scattered. In the liquid crystal display device 1 including the light color conversion unit 30 having the plurality of light scattering layers 33, the light color conversion unit 30 reflects the light of the light source 20 irradiated around the phosphor layers 31 and 32. Since the phosphor layer 31 or 32 is incident on the light scattering layer 33 and the light from the light source 20 irradiated around the light scattering layer 33 is reflected and incident on the light scattering layer 33, the reflection structure unit 40 is provided. The light utilization efficiency of the light source 20 can be increased without using an optical lens.

Further, since the liquid crystal display device 1 does not have a condensing lens, the entire device can be reduced in thickness, and an alignment operation between the condensing lens and the liquid crystal display panel 10 is not required, so that manufacturing efficiency can be improved. Furthermore, problems such as deterioration of the condensing lens and generation of dust generated when the condensing lens and other members rub against each other do not occur, and a decrease in luminance of display light can be suppressed.

Furthermore, since the surface of the first reflective layer 41 is formed in a concavo-convex shape, the light from the light source 20 can be diffusely reflected in various directions and can be suitably incident on the phosphor layers 31 and 32 or the light scattering layer 33. Furthermore, since the refractive indexes of the first adhesive layer 51 and the second adhesive layer 52 are the same as those of the glass substrates 14 and 16 of the liquid crystal display panel 10, the light transmitted through the liquid crystal display panel 10 is appropriately observed. Can be emitted to the person side. In addition, since the third reflective layer 43 is provided on the inclined surface of the through hole 35 of the chamber layer 36, the light emitted from the phosphor layers 31 and 32 and the light scattered by the light scattering layer 33 are directed to the viewer. The brightness of the display light can be increased by appropriate reflection.

<< Embodiment 2 of the Invention >>
8 to 12 show Embodiment 2 of the present invention.

FIG. 8 is a cross-sectional view showing the first mold 70 on which the phosphor layers 31 and 32 and the light scattering layer 33 of the second embodiment are applied. FIG. 9 is a cross-sectional view showing the cover substrate 53 to which the phosphor layers 31 and 32 and the light scattering layer 33 are transferred.

FIG. 10 is a cross-sectional view showing the third reflective layer 43 formed on the side surfaces of the phosphor layers 31 and 32 and the light scattering layer 33. FIG. 11 is a cross-sectional view showing the chamber layer 36 and the second mold 72. FIG. 12 is a cross-sectional view showing the chamber layer 36 in which the first reflective layer 41 is formed.

In the following embodiments, the same portions as those in FIGS. 1 to 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

In the second embodiment, the light color conversion unit 30 is manufactured by a different manufacturing method for the liquid crystal display device 1 of the first embodiment.

That is, in the manufacturing method according to the second embodiment, as shown in FIG. 8, fluorescence is applied to the recess 71 of the first mold 70 in which a plurality of recesses 71 are formed at the same depth by, for example, an inkjet method or a nozzle method. The body layers 31 and 32 are applied and formed. Further, the light scattering layer 33 is applied to the chamber layer 36 by, for example, a nozzle method.

Next, as shown in FIG. 9, the phosphor layers 31 and 32 and the light scattering layer 33 are transferred to the cover substrate 53. That is, the phosphor layers 31 and 32 and the light scattering layer 33 disposed in the first mold 70 are attached to the cover substrate 53 via the first adhesive layer 51. Thereafter, the first mold 70 is removed from the phosphor layers 31 and 32 and the light scattering layer 33.

Next, as shown in FIG. 10, an aluminum film is deposited on the side surfaces of the phosphor layers 31 and 32 and the light scattering layer 33 and the surface of the first adhesive layer 51 to form the third reflective layer 43.

Then, as shown in FIG. 11, in the state where the second mold 72 is disposed so as to cover the phosphor layers 31, 32 and the light scattering layer 33, the phosphor layers 31, 32 or the light scattering layer 33 and the second gold The chamber layer 36 is injection molded by introducing a transparent thermosetting or thermoplastic resin material between the mold 72.

The second mold 72 has a recess 74 having the same depth as the thickness of the phosphor layers 31 and 32 and the light scattering layer 33. An uneven surface is formed on a part of the bottom surface of the recess 74. As a result, a part of the surface of the chamber layer 36 is formed in an uneven shape along the uneven surface of the recess 74.

Next, as shown in FIG. 12, after the second mold 72 is removed from the chamber layer 36, an aluminum film is deposited on the surface of the chamber layer 36 opposite to the cover substrate 53 to form the first reflective layer 41. To do. At this time, a mask or the like is provided so that an aluminum film is not deposited on the surfaces of the phosphor layers 31 and 32 and the light scattering layer 33. Thus, the uneven first reflective layer 41 along the surface of the chamber layer 36 is formed.

Thereafter, as in the first embodiment, the chamber layer 36 is attached to the liquid crystal display panel 10 on which the second reflective layer 42 is formed via the partition wall 45 and the second adhesive layer 52, thereby displaying a liquid crystal display. The apparatus 1 is manufactured.

Therefore, according to the second embodiment, as in the first embodiment, the liquid crystal display device 1 that can increase the light use efficiency of the light source 20 can be suitably manufactured without using a condensing lens.

<< Embodiment 3 of the Invention >>
FIG. 13 shows Embodiment 3 of the present invention.

FIG. 13 is an enlarged cross-sectional view showing the structure of the liquid crystal display device of the third embodiment.

Embodiment 3 is obtained by improving the configuration of the first reflective layer 41 in Embodiment 1 described above.

That is, as shown in FIG. 13, the reflecting surface 47 of the first reflecting layer 41 in the present embodiment is the phosphor layer 31, 32 side or the light scattering layer from the periphery of the phosphor layer 31, 32 or the light scattering layer 33. It has the some inclined surface 47 which inclines toward the 33 side. Thus, the cross section of the chamber layer 36 in which the plurality of inclined surfaces 47 are formed has a saw-tooth shape.

Thereby, the light of the light source 20 irradiated around the phosphor layers 31 and 32 or the light scattering layer 33 is reflected by the plurality of inclined surfaces 47, and the phosphor layers 31 and 32 or 2 in the second reflective layer 42. It gathers toward the region facing the light scattering layer 33. Thereafter, most of the reflected light is further reflected by the second reflecting layer 42 and is incident on the phosphor layers 31 and 32 or the light scattering layer 33.

Therefore, according to the third embodiment, the light utilization efficiency of the light source 20 can be increased because the reflection structure 40 is provided as in the first embodiment. Furthermore, since the first reflective layer 41 has the plurality of inclined surfaces 47, the light from the light source 20 is incident on the phosphor layers 31 and 32 or the light scattering layer 33 more efficiently, thereby improving the light use efficiency. Can be increased.

<< Embodiment 4 of the Invention >>
FIG. 14 shows Embodiment 4 of the present invention.

FIG. 14 is an enlarged cross-sectional view showing the structure of the liquid crystal display device according to the fourth embodiment.

In the fourth embodiment, the reflective structure 40 is formed without providing the partition wall 45 between the chamber layer 36 and the counter substrate 12 in the first embodiment.

That is, the chamber layer 36 in the present embodiment has a convex portion 37 that protrudes toward the liquid crystal display panel 10 from the surfaces of the phosphor layers 31 and 32 and the light scattering layer 33. The liquid crystal display panel 10 is supported by the convex portions 37.

In the present embodiment, the reflection structure 40 includes a chamber layer 36 so as to face the first reflection layer 41 formed on the surface of the chamber layer 36 on the liquid crystal display panel 10 side, the phosphor layers 31 and 32, and the light scattering layer 33. The second reflection layer 42 is supported by 36 and transmits light from the light source 20 and reflects light irradiated from the opposite side of the light source 20.

The first reflective layer 41 has a reflective surface 48 that reflects the collimated light emitted from the light source 20 toward the phosphor layers 31 and 32 or the light scattering layer 33 when viewed from the light source 20 side. . And this reflective surface 48 is one inclination which inclines toward the said fluorescent substance layer 31, 32, or the light-scattering layer 33 side from the front-end | tip of the said convex part 37 in the circumference | surroundings of the fluorescent substance layers 31, 32, or the light-scattering layer 33. It has a surface 48.

As a result, the light of the light source 20 irradiated around the phosphor layers 31 and 32 or the light scattering layer 33 is reflected by the inclined surface 48 and the phosphor layers 31 and 32 or the light scattering in the second reflecting layer 42. It gathers toward the region facing the layer 33. Thereafter, most of the reflected light is further reflected by the second reflecting layer 42 and is incident on the phosphor layers 31 and 32 or the light scattering layer 33.

Therefore, according to the fourth embodiment, as in the first embodiment, since the reflection structure portion 40 is provided, the light use efficiency of the light source 20 can be increased. Furthermore, since the first reflection layer 41 has the inclined surface 48, the light from the light source 20 is made to enter the phosphor layers 31, 32 or the light scattering layer 33 more efficiently, thereby further improving the light use efficiency. be able to. In addition, since the chamber layer 36 has the convex portion 37, it is not necessary to provide the partition wall 45. As a result, the manufacturing process can be simplified and the manufacturing cost can be reduced.

<< Other Embodiments >>
In the first to fourth embodiments, the structure having the first reflective layer 41 and the second reflective layer 42 has been described for the reflective structure 40. However, the present invention is not limited to this, and the phosphor layers 31 and 32 and the light scattering layer are not limited thereto. The reflective structure unit 40 may be configured by another reflective layer provided between the layer 33 and the liquid crystal display panel 10.

Further, the present invention is not limited to the above-described first to fourth embodiments, and the present invention includes a configuration in which these first to fourth embodiments are appropriately combined.

As described above, the present invention is useful for a liquid crystal display device including a light source that emits collimated light.

1 Liquid crystal display device
10 Liquid crystal display panel
14,16 glass substrate
20 Light source
30 Light color converter
31, 32 phosphor layer
33 Light scattering layer
35 Through hole
36 Chamber layer (support member)
40 Reflective structure
41 First reflective layer
42 Second reflective layer
43 3rd reflective layer
45 Bulkhead
47, 48 Inclined surface, reflective surface
52 Second Adhesive Layer

Claims (10)

A liquid crystal display panel;
A light source disposed facing the liquid crystal display panel and emitting collimated light of a predetermined color;
Light color conversion having a plurality of phosphor layers disposed on the opposite side of the light source of the liquid crystal display panel and converting the light of the light source into light of different colors, and a plurality of light scattering layers for scattering the light of the light source A liquid crystal display device comprising:
The light color conversion unit reflects the light of the light source irradiated around the phosphor layer to enter the phosphor layer, and reflects the light of the light source irradiated around the light scattering layer. The liquid crystal display device is provided with a reflection structure that is incident on the light scattering layer. The liquid crystal display device according to claim 1,
The light color conversion unit includes a support member configured to support a state in which a plurality of through holes are formed at predetermined intervals and the phosphor layer or the light scattering layer is disposed inside the through holes.
The reflective structure portion is disposed on the liquid crystal display panel side surface of the support member, and is disposed to face the first reflective layer, and transmits light from the light source and is opposite to the light source. A second reflection layer that reflects light irradiated from the side, and between the phosphor layers or between the phosphor layer and the light scattering layer and between the second reflection layer and the support member A liquid crystal display device comprising an interposed partition wall. The liquid crystal display device according to claim 2,
The liquid crystal display device according to claim 1, wherein the surface of the first reflective layer is formed in an uneven shape. The liquid crystal display device according to claim 3,
The first reflective layer has a reflective surface that reflects the collimated light emitted from the light source so as to be directed toward the phosphor layer side or the light scattering layer side when viewed from the light source side. A liquid crystal display device. The liquid crystal display device according to claim 4,
The liquid crystal display device, wherein the reflection surface has a plurality of inclined surfaces inclined from the periphery of the phosphor layer or the light scattering layer toward the phosphor layer side or the light scattering layer side. The liquid crystal display device according to claim 1,
The light color conversion unit includes a support member configured to support a state in which a plurality of through holes are formed at predetermined intervals and the phosphor layer or the light scattering layer is disposed inside the through holes.
The reflective structure portion is supported by the support member so as to face the first reflective layer formed on the surface of the support member on the liquid crystal display panel side, the phosphor layer, and the light scattering layer. A liquid crystal display device comprising: a second reflective layer that transmits light and reflects light emitted from a side opposite to the light source. The liquid crystal display device according to claim 6,
The first reflective layer has a reflective surface that reflects the collimated light emitted from the light source so as to be directed toward the phosphor layer side or the light scattering layer side when viewed from the light source side. A liquid crystal display device. The liquid crystal display device according to claim 7,
The liquid crystal display device, wherein the reflection surface has one inclined surface that is inclined from the periphery of the phosphor layer or the light scattering layer toward the phosphor layer or the light scattering layer. The liquid crystal display device according to any one of claims 2 to 8,
Between the phosphor layer or the light scattering layer and the first reflective layer and the second reflective layer, an adhesive layer is filled,
The liquid crystal display device according to claim 1, wherein a refractive index of the adhesive layer is the same as a refractive index of a substrate constituting the liquid crystal display panel. The liquid crystal display device according to any one of claims 2 to 9,
A liquid crystal, wherein a third reflective layer inclined with respect to the liquid crystal display panel is interposed between the phosphor layer or the light scattering layer and the inner wall surface of the support member in the through hole. Display device.

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