WO2013042705A1

WO2013042705A1 - Liquid crystal display device and method for manufacturing liquid crystal display device

Info

Publication number: WO2013042705A1
Application number: PCT/JP2012/073996
Authority: WO
Inventors: 康浅岡; 寿史渡辺; 坂井　彰; 裕一居山; 亜希子宮崎; 佐藤　英次
Original assignee: シャープ株式会社
Priority date: 2011-09-22
Filing date: 2012-09-20
Publication date: 2013-03-28

Abstract

A liquid crystal display device (200A) comprises a liquid crystal display panel (100A) and a backlight (110). The liquid crystal display panel (100A) has a liquid crystal layer (10) having a plurality of liquid crystal regions and walls including a polymer between adjacent liquid crystal regions, first and second substrates (1, 2) disposed on the observer-side and the back side of the liquid crystal layer, a first polarizing plate (4) formed on the surface of the first substrate on the observer side, a second polarizing plate (6) formed on the surface of the second substrate (2) on the back side thereof, and a fluorescence layer (12) disposed between the second polarizing plate and a backlight and including a fluorescent substance which excites and generates visible light upon absorbing light of a predetermined wavelength. The backlight (110) has a photoirradiation part for irradiating light of a predetermined wavelength to the fluorescence layer (12), and when viewed from the direction of the line normal to the liquid crystal display panel, at least one side of the outer edge (12e) of the fluorescence layer aligns with one side of the outer edges (4e, 6e) of the first and second polarizing plates and one side of the outer edges (1e, 2e) of the first and second substrates.

Description

Liquid crystal display device and method of manufacturing liquid crystal display device

The present invention relates to a liquid crystal display device and a method for manufacturing the liquid crystal display device.

The liquid crystal display device has advantages such as light weight, thinness and low power consumption, and is used not only as a large television but also as a small display device such as a display unit of a mobile phone.

The liquid crystal display device includes a liquid crystal display panel, a backlight, a circuit and a power source for supplying various electric signals to the liquid crystal display panel, and a housing for housing these. The liquid crystal display device has a display area in which a plurality of pixels are arranged, and a frame area that is located around the display area and does not contribute to display.

In a display area (active area) of a general liquid crystal display panel, a pixel electrode, a thin film transistor (TFT), and the like are provided, and an image, a video, or the like is displayed. On the other hand, in the frame region, a liquid crystal material is connected to a seal portion for bonding substrates so as to seal between substrates, wiring connected to a gate electrode and a source electrode of a TFT, and an external drive circuit for inputting a signal / scanning voltage. Terminals for the purpose are arranged. In this specification, a region where wirings connected to a gate electrode and a source electrode of a TFT, a terminal for connecting to an external drive circuit for inputting a signal / scanning voltage, and the like are sometimes referred to as a connection region. In order to prevent deterioration of display quality at the outer periphery of the display area due to light leakage from the backlight or disorder of alignment of liquid crystal molecules, a black mask (light shielding member) is usually provided in the frame area. ing. Thus, the frame area is an area that does not contribute to display (invalid display portion). The narrowing of the frame of a liquid crystal display panel is progressing year by year, but it is difficult to eliminate the frame area.

FIG. 23 is a schematic plan view of a general liquid crystal display device (for example, a TN (Twisted Nematic) type liquid crystal display device) 500.

The liquid crystal display device 500 includes a display area 85 that performs display and a frame area 87 that is positioned at the periphery of the display area 85. A plurality of pixels (not shown) are formed in the display area 85. The frame region 87 has a seal portion (not shown) formed so as to surround the liquid crystal layer when viewed from the normal direction. The sealing portion is formed by applying the sealing material to form a predetermined pattern on the substrate by a dispenser device, a screen printing machine, or the like, and bonding the other material to the other substrate, and then curing the sealing material. . The width of the seal portion thus formed is about 1 mm or more. For this reason, the width W of the frame region 87 is set to be at least larger than the width of the seal portion.

On the other hand, Patent Document 1 manufactures a plurality of liquid crystal display panels by bonding a pair of substrates through a sealing material provided so as to form a predetermined pattern, and then dividing the substrate together with the sealing material. The method of doing is disclosed. According to this method, since the width of the seal portion can be reduced to about 1 mm or less, the width of the frame region can be made smaller than that in the prior art.

On the other hand, Patent Document 2 discloses a liquid crystal display panel provided with a polymer dispersed liquid crystal (PDLC) layer using a curable vinyl compound. Patent Document 2 describes that a polymer-dispersed liquid crystal layer formed using a curable vinyl compound has an adhesive effect and can eliminate the need for a seal portion. However, Patent Document 2 does not disclose any method for manufacturing a liquid crystal display panel having no seal portion.

Japanese Patent No. 3389461 Japanese Patent No. 2550627

According to the method disclosed in Patent Document 1, the frame area can be made narrower than before. However, as a result of studies by the present inventor, when the frame area is narrowed, it becomes difficult to perform display at the peripheral edge of the display area with the same brightness as the central part of the display area and with low viewing angle dependency. I found a problem. This problem will be described in detail later.

Further, the present inventor has repeatedly studied and found that a liquid crystal display device in which the frame region is further narrowed can be obtained by using the material of the liquid crystal layer proposed in Patent Document 2. However, even in such a liquid crystal display device, the same problem as described above may occur.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device capable of performing high-quality display with uniform brightness over the entire display area even when the frame area is narrowed. Is to provide.

A liquid crystal display device according to an embodiment of the present invention is a liquid crystal display device including a liquid crystal display panel including a display region having a plurality of pixels, and a backlight disposed on the back side of the liquid crystal display panel, The liquid crystal display panel includes a plurality of liquid crystal regions, a liquid crystal layer having a polymer-containing wall between adjacent liquid crystal regions of the plurality of liquid crystal regions, and a liquid crystal layer disposed on an observer side of the liquid crystal layer. One substrate, a second substrate disposed on the back side of the liquid crystal layer, a first polarizing plate formed on the first substrate, a second polarizing plate formed on the second substrate, and the second A fluorescent layer that is disposed between the polarizing plate and the backlight and includes a fluorescent layer that emits visible light upon absorption of light having a predetermined wavelength, and the backlight includes light having the predetermined wavelength. Having a light irradiation part for irradiating the fluorescent layer, When viewed from the normal direction of the liquid crystal display panel, at least one side of the outer edge of the phosphor layer is one side of the outer edge of the first and second polarizing plates and one side of the outer edge of the first and second substrates. Consistent.

In a preferred embodiment, when viewed from the normal direction of the liquid crystal display panel, the at least one side of the outer edge of the fluorescent layer is aligned with one side of the outer edge of the liquid crystal layer.

In a preferred embodiment, the backlight includes a light guide plate, the light irradiation unit is disposed on a surface of the light guide plate facing the fluorescent layer, and in the display region, a part of the fluorescent layer is the light guide. It does not overlap with the light irradiation part of the light plate.

In a preferred embodiment, the fluorescent material includes a dichroic fluorescent dye, and in the fluorescent layer, the direction of the transition moment of the dichroic fluorescent dye is parallel to the direction of the transmission axis of the second polarizing plate. .

In a preferred embodiment, the liquid crystal display panel further includes a reflective portion disposed on at least a part of a side surface of the liquid crystal display panel, and the reflective portion is viewed from a normal direction of the liquid crystal display panel. And arranged along the at least one side of the outer edge of the fluorescent layer.

In a preferred embodiment, the thickness of the fluorescent layer is larger at the first portion located at the periphery of the fluorescent layer than at the central portion.

In a preferred embodiment, the concentration of the fluorescent substance in the fluorescent layer is higher in the first part located at the periphery of the fluorescent layer than in the central part.

In a preferred embodiment, the first part of the fluorescent layer does not overlap the light irradiation part, and the central part of the fluorescent layer overlaps the light irradiation part.

In a preferred embodiment, the liquid crystal display device is formed between the liquid crystal layer and the first substrate and the second substrate, respectively, and the first alignment film and the first alignment film are formed so as to be in contact with the liquid crystal layer, respectively. It further has a bi-alignment film.

In a preferred embodiment, the liquid crystal display device is not provided with a seal portion along at least one side of the outer edge of the liquid crystal layer when viewed from the normal direction of the liquid crystal display panel, and is provided with the seal portion. The at least one side of the outer edge of the liquid crystal layer that is not aligned with the at least one side of the outer edge of the fluorescent layer.

In the method for manufacturing a liquid crystal display device according to an embodiment of the present invention, (A1) a fluorescent film containing a fluorescent material that emits visible light when excited by absorbing light having a predetermined wavelength is formed on the surface of a polarizing film. A step of obtaining a laminated film including a polarizing plate film and the fluorescent film; (A2) a step of obtaining a laminated body including a polarizing plate and a fluorescent layer by cutting the laminated film; and (B) a first substrate and a first substrate. A liquid crystal layer formed between two substrates, a first substrate and a second substrate, and having a plurality of liquid crystal regions and a wall containing a polymer between adjacent liquid crystal regions of the plurality of liquid crystal regions; A step of forming a first panel structure including: (C) placing the laminate on the second substrate of the first panel structure so that the polarizing plate is on the first panel structure side; And another polarizing film on the first substrate. (D) a step of obtaining a liquid crystal display panel by cutting the second panel structure into a predetermined size; and (E) a step of obtaining the liquid crystal display panel. And disposing a backlight having a light irradiation unit for irradiating the liquid crystal display panel with the light having the predetermined wavelength on the back side.

In a preferred embodiment, (A1) a fluorescent film containing a fluorescent substance that emits visible light when excited by absorbing light of a predetermined wavelength is formed on the surface of the polarizing film, and the polarizing film and the fluorescent film are A step of obtaining a laminated film including, (A2) a step of obtaining a laminated body including a polarizing plate and a fluorescent layer by cutting the laminated film, (B) a first substrate and a second substrate, and the first substrate. A first panel structure including a plurality of liquid crystal regions and a liquid crystal layer having a polymer-containing wall between adjacent liquid crystal regions of the plurality of liquid crystal regions. A step of forming; (c) a step of cutting out the first panel structure to a predetermined size; and (d) the polarizing plate on the second substrate of the cut out first panel structure. Front to be on the body side A step of obtaining a liquid crystal display panel by installing a laminate and disposing another polarizing plate on the first substrate; and (E) emitting light of the predetermined wavelength on the back side of the liquid crystal display panel. And a step of disposing a backlight having a light irradiating unit for irradiating the display panel.

In a preferred embodiment, the fluorescent material includes a dichroic fluorescent dye, and the step (A1) includes the step of transmitting the direction of the transmission axis of the polarizing film and the dichroic fluorescent dye on the surface of the polarizing film. Forming the phosphor film so that the direction of the transition moment is parallel.

In a preferred embodiment, the step (A1) includes a step of preparing a fluorescent film containing the dichroic fluorescent dye, a step of stretching the fluorescent film in a predetermined direction, the stretching direction, and the polarizing film. Forming the phosphor film by bonding the phosphor film to the surface of the polarizing film so that the transmission axis of the phosphor film is parallel.

In a preferred embodiment, the step (A1) includes a step of rubbing a surface of the polarizing film in a direction parallel to a transmission axis of the polarizing film, and the surface on which the rubbing is performed. And a step of forming the fluorescent film by applying a resin containing the fluorescent dye and then curing the resin.

In a preferred embodiment, the step (A1) includes a step of forming the phosphor film such that a thickness of the phosphor film is increased in a predetermined portion, and the predetermined portion is the liquid crystal display panel, Located on the periphery of the phosphor layer.

In a preferred embodiment, the step (A1) includes a step of forming the fluorescent film so that the concentration of the fluorescent substance in the fluorescent film is high at a predetermined portion, and the predetermined portion includes the liquid crystal display. In the panel, it is located at the periphery of the fluorescent layer.

In a preferred embodiment, the method further includes a step of forming a reflection portion so as to cover at least a part of the side surface of the liquid crystal display panel.

According to the embodiment of the present invention, even when the width of the frame region is smaller than the conventional one, it is possible to suppress a decrease in display characteristics (brightness and visibility) at the peripheral portion of the display region, and uniform brightness in the entire display region. High quality display can be realized. Therefore, it is possible to achieve both high display characteristics and narrowing of the frame area.

(A) is a schematic plan view of the liquid crystal display device 200A of the first embodiment according to the present invention, and (b) and (c) are respectively a line II ′ and a line II— of (a). It is typical sectional drawing of 200 A of liquid crystal display devices along an II 'line. It is typical sectional drawing of 200 A of liquid crystal display devices. (A) is a schematic cross-sectional view for explaining a method of forming a polarizing plate and a fluorescent layer in the first embodiment, and (b) to (d) are respectively a polarizing plate and a fluorescent layer. It is an expanded sectional view for demonstrating the edge part (cut surface) of the laminated body 50 which becomes. (A) is a typical perspective view explaining the manufacturing method of liquid crystal display panel 100A in 1st Embodiment, (b) is a typical perspective view of one TFT substrate 44. FIG. FIG. 6C is a schematic cross-sectional view of the TFT substrate 44 taken along line III-III ′ in FIG. (A) is a typical perspective view explaining the manufacturing method of liquid crystal display panel 100A in 1st Embodiment, (b) is typical sectional drawing in alignment with the IV-IV 'line of (a). FIG. FIGS. 5A to 5G are schematic cross-sectional views illustrating a method for manufacturing the liquid crystal display panel 100A in the first embodiment. It is typical sectional drawing of the TFT substrate 44 for demonstrating the other manufacturing method of 100 A of liquid crystal display panels. (A) is sectional drawing for demonstrating the drive system of 100 A of liquid crystal display panels in 1st Embodiment, (b) is an enlarged plan view of the liquid crystal layer 10 shown to (a). (A) is sectional drawing for demonstrating the other drive system of the other liquid crystal display panel 100B in 1st Embodiment, (b) is an enlarged plan view of the liquid crystal layer 10 shown to (a). is there. (A) is a perspective view for demonstrating the fluorescent layer 12 in 2nd Embodiment by this invention, (b) and (c) are respectively the dichroism fluorescent dyes contained in the fluorescent layer 12 It is a figure which shows an absorption characteristic and a light emission characteristic. (D) is a graph showing the wavelength dependence of absorption and fluorescence intensity of a dichroic fluorescent dye. It is typical sectional drawing for demonstrating the formation method of the polarizing plate and fluorescent layer in 2nd Embodiment. It is typical sectional drawing for demonstrating the other formation method of the polarizing plate and fluorescent layer in 2nd Embodiment. It is a typical sectional view of liquid crystal display device 200C of a 3rd embodiment by the present invention. (A) And (b) is a figure for demonstrating the effect of the reflection part 24 in 3rd Embodiment, (a) is a liquid crystal display panel which does not have a reflection part, (b) has a reflection part. It is typical sectional drawing of a liquid crystal display panel. (A) is a schematic plan view of a liquid crystal display device 200D of the fourth embodiment according to the present invention, and (b) is a schematic view of the liquid crystal display device 200D along the line VV ′ of (a). FIG. It is typical sectional drawing for demonstrating the formation method of the polarizing plate and fluorescent layer in 4th Embodiment. (A) And (b) is sectional drawing and the enlarged plan view for demonstrating the drive system of the liquid crystal display panel 100E in 5th Embodiment, respectively. It is an enlarged plan view for demonstrating the drive system of the other liquid crystal display panel 100F in 5th Embodiment. (A) And (b) is sectional drawing and the enlarged plan view for demonstrating the drive system of the liquid crystal display panel 100G in 5th Embodiment, respectively. It is an enlarged plan view for demonstrating the drive system of the other liquid crystal display panel 100H in 5th Embodiment. It is a top view which shows an example of the display system 300 of embodiment by this invention. It is a perspective view for demonstrating an example of the electronic device 400 of embodiment by this invention. FIG. 11 is a schematic plan view of a conventional liquid crystal display device 500. It is sectional drawing which shows the liquid crystal display device 700 of a reference example.

First, the problems associated with the narrowing of the frame area found by the present inventor will be described with reference to the drawings.

FIG. 24 is a cross-sectional view showing a reference example of a liquid crystal display device. The liquid crystal display device 700 of the reference example includes a liquid crystal display panel 600 and a backlight 610 provided on the back side thereof. When viewed from the viewer side of the liquid crystal display device 700, the liquid crystal display device 700 has a display region 85 and a region (frame region) 87 other than the display region 85. The frame area 87 is a non-display area. In the liquid crystal display panel 600, for example, the width of the seal portion is reduced by using the method disclosed in Patent Document 1, and as a result, the width W2 of the non-display area in the liquid crystal display panel 600 is smaller than the conventional one. The width W2 of the non-display area may be reduced using other methods.

The backlight 610 is an edge light type backlight using a light guide plate, for example. The backlight 610 in the illustrated reference example includes a light guide plate 612, an optical film sheet 614 for uniformly scattering light emitted from the light guide plate 612, and a bezel 616 for fixing the optical film sheet 614. ing. A portion of the upper surface of the backlight 610 that does not overlap the display area 85 is provided with a light shielding portion 618 so that the backlight light does not enter the display area 85 from the outside of the display area 85.

In the liquid crystal display device 700, the backlight 610 is disposed so that the end of the display area 85 and the end of the light guide plate 612 and the optical film sheet 614 are substantially aligned when viewed from the viewer side. In such a case, the width W1 of the frame region 87 is larger than the width W2 of the non-display region defined by the frame light shielding portion or the seal portion formed by the black matrix of the color filter (CF), and the thickness of the side wall of the bezel 616. The length corresponding to the length increases. Therefore, even if the width of the seal portion is reduced, the width of the frame region 87 is equal to or greater than the thickness of the bezel 616. Therefore, the width of the frame region 87 is reduced to less than the thickness of the side wall of the bezel 616, or It is difficult to eliminate 87.

Further, when viewed from the observer side of the liquid crystal display device 700, the edge of the light guide plate 612 is visible at the peripheral edge of the display area 85, which may cause display unevenness.

Further, as a result of examination by the present inventor, the peripheral area 85P of the display area 85 is darker than the central area of the display area 85, and display defects are likely to occur, and the display area 85 has a uniform brightness over the entire display area 85. I found it difficult to display. As shown in the drawing, a part of light 620 that travels through the light guide plate 612 to the end of the light guide plate 612 is reflected by the end surface of the light guide plate 612 and is emitted from the inside of the display area 85. For this reason, it is considered that light from the light guide plate 612 does not easily enter the portion 85P of the display area 85 located on the end of the light guide plate 612.

In order to irradiate the entire display region 85 uniformly, for example, it is conceivable to provide a light guide plate 612 that is slightly larger in size than the display region 85 when viewed from the observer side of the liquid crystal display device 700. However, when the light guide plate 612 is enlarged, the backlight 610 is also enlarged, so that the frame area 87 cannot be sufficiently narrowed. Further, when the light guide plate 612 is enlarged, it is necessary to increase the width of the light shielding portion 618 for shielding the backlight light passing outside the display area 85, and the width of the frame area 87 is further increased.

As described above, in the conventional liquid crystal display device, it is difficult to narrow the frame area more effectively than the conventional one while maintaining good display characteristics.

The inventor has intensively studied the problems associated with the narrowing of the frame area as described above. As a result, a fluorescent layer is provided between the back substrate and the backlight of the liquid crystal display panel, and at least a part of the end of the fluorescent layer is aligned with the end of the substrate or polarizing plate when viewed from the observer side. Thus, it was found that the frame area can be narrowed while uniformly illuminating the entire display area, and the present invention has been achieved.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

(First embodiment)
1A to 1C are diagrams illustrating a liquid crystal display device 200A according to an embodiment of the present invention. FIG. 1A is a schematic plan view of the liquid crystal display device 200A, and FIGS. 1B and 1C are the II ′ and II-II ′ lines in FIG. 1A, respectively. It is typical sectional drawing of 200 A of liquid crystal display devices along line.

As shown in FIG. 1A, the liquid crystal display device 200A has a display area 25 including a plurality of pixels (not shown) and a frame area 27. The frame region 27 includes a connection region 26 where a mounting portion such as a chip or FPC is formed, and a region where a seal portion 8 or a light shielding portion (not shown) is formed. In this example, the frame region 27 is formed along only one side of the sides constituting the outer edge (for example, substantially square) of the display region 25, and the frame region 27 is not formed along the other sides. The frame area 27 may be formed so as to surround the display area 25.

As shown in FIGS. 1B and 1C, the liquid crystal display device 200A includes a liquid crystal display panel 100A and a backlight 110.

The liquid crystal display panel 100A includes a liquid crystal layer 10, a first substrate 1 disposed on the viewer side of the liquid crystal layer 10, a second substrate 2 disposed on the back side of the liquid crystal layer 10, a second substrate 2 and a back. It has a fluorescent layer (fluorescent light emitting layer) 12 formed between the light 110. The first substrate 1 and the second substrate 2 are provided with

polarizing plates

4 and 6, respectively. The liquid crystal layer 10 is sandwiched between the first substrate 1 and the second substrate 2. Further, a seal portion 8 is formed between the first substrate 1 and the second substrate 2 so as to be in contact with a part of the side surface of the liquid crystal layer 10.

In the present embodiment, the fluorescent layer 12 is formed on the surface of the polarizing plate 6 on the backlight 110 side. The fluorescent layer 12 contains a fluorescent material, and emits light (here, visible light) having a longer wavelength than the excitation light when irradiated with light having a predetermined wavelength (excitation light). The backlight 110 has a light irradiation unit (not shown) that emits the excitation light to the fluorescent layer 12. The excitation light is, for example, UV light. The fluorescent dye is not particularly limited. For example, a dichroic benzothiadiazole fluorescent dye, a coumarin fluorescent dye, a cyanine fluorescent dye, a pyridine fluorescent dye, a rhodamine fluorescent dye, a styryl fluorescent dye, an anthraquinone fluorescent dye, etc. It may be. In the liquid crystal display panel 100A, when the fluorescent layer 12 is irradiated with excitation light (for example, UV light) from the backlight 110, the fluorescent layer 12 emits light, and display can be performed using the light from the fluorescent layer 12. .

The liquid crystal layer 10 has, for example, a plurality of liquid crystal regions having a nematic liquid crystal material and a wall containing a polymer between adjacent liquid crystal regions of the plurality of liquid crystal regions. The wall containing the polymer can contribute to the adhesion between the first substrate 1 and the second substrate 2, and can maintain the distance between the first substrate 1 and the second substrate 2. Therefore, as shown in the drawing, at least a part of the side surface of the liquid crystal layer 10 can be aligned with the side surface of the first substrate 1 and the side surface of the second substrate 2. Thus, in the present embodiment, when viewed from the normal direction of the liquid crystal layer 10, the seal portion 8 does not have to be formed so as to surround the entire liquid crystal layer 10. The width can be reduced. In this specification, the seal portion 8 is a member that is formed of a seal material and does not include a liquid crystal material, and is formed separately from the liquid crystal layer.

In the present embodiment, when viewed from the normal direction of the liquid crystal display panel 100A, at least a part of the outer edge of the fluorescent layer 12 includes the outer edges of the polarizing plate 4 and the polarizing plate 6, and the first substrate 1 and the second substrate. Aligned with the outer edge of the two. This will be described more specifically with reference to FIG. In FIG. 1A, the edges (outer edges) of the first substrate 1, the second substrate 2, the

polarizing plates

4 and 6, the seal portion 8, and the fluorescent layer 12 are respectively connected to

lines

1e, 2e, 4e, 6e, 8e and 12e. As shown in the drawing, the side of the outer edge 12e of the fluorescent layer 12 extends along the first substrate 1 along at least one side (three sides in this example) of the sides constituting the outer edge (for example, substantially square) of the display region 25. It is aligned with the sides of the

outer edges

1e, 2e, 4e and 6e of the second substrate 2 and the

polarizing plates

4 and 6. In other words, the positions of the end portions of the fluorescent layer 12, the first and

second substrates

1 and 2, and the

polarizing plates

4 and 6 are aligned. Hereinafter, a portion of the outer edge 12e of the fluorescent layer 12 that is aligned with the

outer edges

1e, 2e, 4e, and 6e of the first and

second substrates

1 and 2 and the

polarizing plates

4 and 6 is abbreviated as “edge S”. . Further, in this specification, the fact that the sides are aligned with each other when viewed from the normal direction includes the case where the sides have different lengths. For example, the case where almost the entire short side is aligned with the long side is included.

In the illustrated example, the edge S of the fluorescent layer 12 is also aligned with the outer edge of the liquid crystal layer 10. That is, the seal part is not formed along the edge part S. Therefore, it is not necessary to provide the frame area along the edge S, which is advantageous. A frame region may be formed along the edge S. In that case, since it is not necessary to set the width of the frame region in consideration of the seal portion 8 and the backlight 110, the width of the frame region along the edge S is set to the width of the frame region along the portion other than the edge S. Can be smaller than the width.

Next, the operation and effect of the liquid crystal display device 200A of the present embodiment will be described with reference to FIG.

In FIG. 2, the entire backlight 110 is not shown, but instead, the light guide plate 112 in the backlight 110 and the light emitting unit 111 that is arranged at the end of the light guide plate 112 and emits, for example, UV light are shown. ing. The light guide plate 112 has a light irradiation part 112 s on the surface facing the fluorescent layer 12. The light emitting unit 111 includes, for example, a light emitting diode (LED).

UV light emitted from the light emitting unit 111 travels in the light guide plate 112. A part of the light traveling in the light guide plate 112 enters the fluorescent layer 12 from the light irradiation unit 112s. At this time, as shown in the drawing, even when the light 120 is incident on the fluorescent layer 12 from the vertical direction or the light 122 is incident from the inclined direction, the

incident light

120, 122 becomes excitation light, and the fluorescent layer 12 emits light in all directions. Light (visible light) from the fluorescent layer 12 enters the liquid crystal display panel 100A from the polarizing plate 6. The liquid crystal display panel 100A performs display by adjusting the amount of light transmitted through the two

polarizing plates

4 and 6 by electrically driving the liquid crystal held between the

polarizing plates

4 and 6.

The fluorescent layer 12 in the present embodiment can emit light in all directions without depending on the incident direction of the excitation light with respect to the fluorescent layer 12. Therefore, when viewed from the viewer side, even if a part of the fluorescent layer 12 (for example, a peripheral portion) does not overlap the light guide plate 112, the excitation light is obliquely directed from the light guide plate 112 to the portion of the fluorescent layer 12. , The fluorescent layer 12 can irradiate light (visible light) uniformly over the entire display region 25. Therefore, the size of the light guide plate 112 (the size of the backlight 110) can be made smaller than before. For example, the size of the light guide plate 112 when viewed from the viewer side may be equal to or smaller than the size of the display region 25 or the fluorescent layer 12. Alternatively, when viewed from the viewer side, at least a part of the outer edge of the light guide plate 112 may be inside the outer edge of the display region 25 or the fluorescent layer 12. Thus, by reducing the size of the light guide plate 112 or arranging the end of the light guide plate 112 on the inner side of the fluorescent layer 12, the frame area can be made narrower than before without deteriorating the display characteristics. Alternatively, it is possible to partially eliminate the frame area. Furthermore, since the light distribution in the front surface of the liquid crystal display panel 100A can be controlled without considering the incident direction with respect to the fluorescent layer 12, the structure of the optical system such as the light guide plate 112 and the light scattering sheet (not shown) is simplified. Can also be designed.

In this specification, “there is no frame area” means that the distance between the end of the display area 25 and the end of the liquid crystal display device 200A is less than 0.2 mm, which is the resolution of the human eye. means. This is because if the distance is less than 0.2 mm, the human eye cannot recognize the frame area and it appears that there is no frame area. The “end of the display region” here means strictly the end of the pixel located at the outermost edge among the plurality of pixels as viewed from the observer side. In the portion of the side surface of the liquid crystal layer that is not in contact with the seal portion, the distance between the side surface of the liquid crystal layer and the end portion of the pixel located at the outermost edge can be suppressed to less than 0.2 mm (for example, 0.15 mm or less). The frame area can be substantially eliminated.

As described above, conventionally, when the width of the frame region 27 is reduced, a bright display cannot be obtained at the peripheral portion of the display region 25. It was necessary to increase the size of the light plate), and the width of the frame area could not be reduced sufficiently. On the other hand, the liquid crystal display device 200 </ b> A of the present embodiment includes the fluorescent layer 12 that emits light by UV light (excitation light) incident from the backlight 110. The entire fluorescent layer 12 emits light substantially uniformly without depending on the incident direction of UV light. Therefore, even when the width of the frame region is small or the frame region is not formed, the fluorescent layer 12 allows the same amount of light to be incident on the peripheral portion of the display region 25 as the other portions. A brighter display can be realized even at the periphery of the region 25. Moreover, even when the light guide plate 112 of the backlight 110 is smaller than the display area 25 when viewed from the observer side, it is possible to perform display with more uniform brightness over the entire display area 25. .

When viewed from the observer side, if the light guide plate 112 is made smaller than the display area 25, there are the following advantages. Conventionally, it has been necessary to form a light shielding portion for shielding light emitted from the light guide plate through the region other than the display region to the viewer side. However, according to the present embodiment, the light is emitted from the light guide plate 112. Since the emitted light is UV light, it does not cause deterioration in display quality even when emitted to the viewer side. Accordingly, since it is not necessary to provide a light shielding portion at the peripheral edge of the display area 25, the display area can be further enlarged. Further, it is advantageous because display unevenness due to the edge of the light guide plate 112 being visible at the periphery of the display area 25 can be suppressed.

Further, according to the present embodiment, the fluorescent layer 12 is formed up to the end of the polarizing plate 6 along at least one side of the peripheral edge of the display region 25, and light is also incident in the vicinity of the end of the polarizing plate 6. be able to. For this reason, a favorable display can be performed also in the area | region (area | region located in the periphery of the display area 25) on the peripheral part of the polarizing plate 6. FIG. More preferably, the end of the fluorescent layer 12 and the end of the polarizing plate 6 are aligned over the entire outer edge of the fluorescent layer 12. Thereby, since light can be incident on the entire surface of the polarizing plate 6, it is possible to perform good display in a region having the same size as the surface of the polarizing plate 6.

In general, when a fluorescent layer is to be formed on the polarizing plate surface, a method of printing a paint containing a fluorescent substance or attaching a fluorescent film can be used. However, in these methods, deviation occurs at the ends of the polarizing plate and the fluorescent layer, and it is difficult to align these ends. For this reason, when viewed from the observer side, a display region is formed in a portion where the polarizing plate and the fluorescent layer overlap, and a portion of the polarizing plate or the fluorescent layer that protrudes from the display region constitutes a frame region. Therefore, there is a problem that the panel size becomes large with respect to the display area. On the other hand, in the present embodiment, as will be described later, for example, the fluorescent layer 12 and the polarizing plate 6 having a predetermined size are obtained by cutting a polarizing plate film having a phosphor film formed on the surface thereof. According to this method, the end of the fluorescent layer 12 and the end of the polarizing plate 6 can be easily aligned.

Further, when viewed from the normal line direction of the liquid crystal display panel 100A, the edges along the three sides excluding the side adjacent to the frame region 27 among the sides constituting the outer edge of the display region 25 (I side, II The outer edges of the

polarizing regions

4 and 6 defining the display area 25 and the outer edges of the first and

second substrates

1 and 2 are aligned with the outer edge of the display area 25. The distance from the outer edge of the liquid crystal display panel can be reduced.

When the liquid crystal layer 10 is viewed from the observer side, the liquid crystal layer 10 is preferably not surrounded by the seal portion 8. For example, if the outer edge of the liquid crystal layer 10 is substantially rectangular, the seal portion 8 may be disposed only along one or two sides of the rectangle. In the illustrated example, the seal portion 8 is formed along one side that forms the outer edge of the liquid crystal layer 10, but is not disposed along the other side. If the seal portion is not formed, the frame region can be narrowed. Therefore, when the end of the fluorescent layer 12 and the end of the polarizing plate 6 are aligned at this portion, the brightness at the peripheral portion of the display region is further reduced. It can be effectively suppressed. Note that since the material of the liquid crystal layer 10 has adhesiveness, the liquid crystal display device 200 </ b> A may not have a seal portion including a seal material.

Furthermore, when the liquid crystal display panel 100A is viewed from the observer side, at least one side of the outer edges of the liquid crystal layer 10 is preferably aligned with the outer edges of the first substrate 1 and the second substrate 2. That is, it is preferable that a portion of the side surface of the liquid crystal layer 10 not in contact with the seal portion is continuous with the side surfaces of the first substrate 1 and the second substrate 2. This makes it possible to further reduce the width of the frame region or eliminate the frame region along the portion of the outer edge of the liquid crystal layer 10 aligned with the

substrates

1 and 2. As described above, in the illustrated example, when viewed from the normal direction of the liquid crystal display panel 100A, the edge S of the fluorescent layer 12 is not only the outer edges of the

substrates

1 and 2 and the

polarizing plates

4 and 6, It is also aligned with the outer edge side of the liquid crystal layer 10. This is advantageous because the frame region need not be provided along the edge S.

The backlight 110 only needs to irradiate the fluorescent layer 12 with UV light so that the portion of the fluorescent layer 12 positioned in the display region 25 can emit light substantially uniformly. When viewed from the normal direction of the liquid crystal display panel 100A, the backlight 110 is preferably substantially aligned with the outer edge of the liquid crystal display panel 100A or on the inner side of the outer edge of the liquid crystal display panel 100A. Thereby, it is possible to prevent the frame area from increasing due to the size of the backlight 110. As an example, such a configuration can be realized by making the size of the light guide plate 112 in the backlight 110 when viewed from the viewer side smaller than the size of the fluorescent layer 12.

The liquid crystal layer 10 can be formed using the same material as the polymer dispersed liquid crystal. The polymer-dispersed liquid crystal may be PDLC (Polymer Dispersed Liquid Crystal) having a structure in which water-drop-like liquid crystal is dispersed in a polymer, or PNLC (Polymer) having a structure in which a polymer network is stretched around a liquid crystal layer. (Network Liquid Crystal). In PNLC, the liquid crystal exists in a continuous state in the polymer without forming water droplets.

When the liquid crystal layer 10 is formed using a material similar to PDLC, the liquid crystal layer 10 is compatible with, for example, a mixture of a nematic liquid crystal material (that is, a low molecular liquid crystal composition) and a photocurable resin (monomer and / or oligomer). It is obtained by polymerizing a photocurable resin after being arranged between transparent substrates. Although the kind of photocurable resin is not specifically limited, Preferably an ultraviolet curable resin is used. When an ultraviolet curable resin is used, there is no need to heat the mixture when polymerization is performed, so that adverse effects due to heat on other members can be prevented. Monomers and oligomers may be monofunctional or polyfunctional. Since the liquid crystal layer 10 has a continuous polymer wall, the distance between the first substrate 1 and the second substrate 2 can be stably maintained without forming a seal portion.

When a panel structure is formed by holding a liquid crystal layer having no polymer wall with a pair of mother substrates, the liquid crystal is held in a region defined by the seal portion in the panel structure. When the panel structure is cut at a portion other than the seal portion, the liquid crystal flows out between the substrates. On the other hand, when the panel structure is formed using the liquid crystal layer in the present embodiment, the liquid crystal can be held between the first substrate 1 and the second substrate 2 by the polymer wall. Even if cut, the liquid crystal does not flow out between the

substrates

1 and 2. Therefore, as will be described later, the frame region can be eliminated by cutting the peripheral edge of the panel structure. In this manner, a liquid crystal display panel in which the frame area is narrowed (or the frame area is eliminated) can be realized by using the same material as the polymer dispersed liquid crystal. The detailed structure and manufacturing method of such a liquid crystal display panel are described in unpublished patent applications (PCT / JP2012 / 068843, PCT / JP2012 / 068835) by the present applicant.

Although not shown, the liquid crystal display panel 100A includes a thin film transistor (TFT) and a pixel electrode formed for each pixel on the second substrate 2, a color filter layer formed on the first substrate 1, and a color filter layer. A common electrode formed thereon. The pixel electrode may be formed up to the vicinity of the side surface of the second substrate 2. The common electrode may be formed over almost the entire surface of the first substrate 1.

Further, a drive circuit electrically connected to the TFT is formed on the second substrate 2. The drive circuits are formed in the connection regions 26 located outside the display region 25, respectively. Furthermore, the drive circuit is connected to an external circuit in the connection region 26 via, for example, FPC (Flexible Printed Circuits). In addition to the FPC, the drive circuit may be connected to an external circuit through an LSI (Large Scale Integration) driver, TAB (Tape Automated Bonding), or COF (Chip On Film).

As shown in the drawing, it is preferable that a seal portion 8 for bonding the first substrate 1 and the second substrate 2 is formed between the display region 25 and the connection region 26. The seal portion 8 is made of, for example, a photo-curing resin (for example, product name: Photorec S-WB manufactured by Sekisui Chemical Co., Ltd.). By forming the seal portion 8, it is possible to prevent the liquid crystal material from leaking into the connection region 26 when the liquid crystal display panel 100A is manufactured. The width of the seal portion 8 is about 1 mm, for example.

If necessary, a side sealing resin portion may be formed on the side surface of the liquid crystal display panel 100A. By forming the side sealing resin portion, the mechanical strength of the liquid crystal display panel 100A is improved, and moisture and the like are prevented from entering the liquid crystal layer 10, so that reliability can be improved. The side surface sealing resin portion may be formed of, for example, an ultraviolet curable resin.

<Method for Manufacturing Liquid Crystal Display Device 200A>
Next, a method for manufacturing the liquid crystal display device 200A according to the present invention will be specifically described with reference to FIGS.

First, a method for forming a fluorescent layer on the surface of the polarizing plate 6 disposed on the back side of the liquid crystal display panel 100A will be described. FIG. 3A is a diagram for explaining an example of a method of forming a polarizing plate used in this embodiment, and FIGS. 3B to 3D are cross-sectional views illustrating the shape of the edge of the polarizing plate, respectively. FIG.

First, as shown in FIG. 3A, a fluorescent film 12a containing a fluorescent light-emitting substance is bonded to the surface of the polarizing film 6a to obtain a laminated film. Next, the laminated film is cut to a predetermined size. Thus, the laminated body 50 which consists of the polarizing plate 6 and the fluorescent layer 12 is obtained.

Since the polarizing film 6a and the fluorescent film 12a are cut at the same time, in the laminate 50, the cut surfaces of the polarizing film 6 and the fluorescent layer 12 are continuous. For example, as shown in FIG. 3B, it may be cut in a direction perpendicular to the surface of the polarizing plate 6. Or you may cut | disconnect in the direction inclined with respect to the surface of the polarizing plate 6. FIG. For example, as shown in FIG. 3C, the fluorescent layer 12 may be cut so that the cut surface has a tapered shape located inside the cut surface of the polarizing plate 6, or as shown in FIG. Thus, you may cut | disconnect so that the cut surface of the fluorescent layer 12 may have a reverse taper shape located outside the cut surface of the polarizing plate 6. Even when the cutting direction is inclined with respect to the surface of the polarizing plate 6, the effect of the present invention can be obtained if the cutting surfaces of the polarizing plate 6 and the fluorescent layer 12 are continuous. In this specification, “when viewed from the normal direction of the liquid crystal display panel 100A, the outer edge of the polarizing plate 6 and the outer edge of the fluorescent layer 12 are aligned” includes the case where the cutting direction is inclined. .

The formation method of the fluorescent layer 12 is not limited to the above. After applying a paint containing a fluorescent light-emitting substance on the surface of the polarizing film 6a, the polarizing film 6a may be cut.

Subsequently, a method for manufacturing the liquid crystal display device 200A using the laminate 50 obtained by the above method will be described with reference to FIGS.

4 (a) and 4 (b) are schematic perspective views for explaining a method of manufacturing the liquid crystal display panel 100A. FIG. 4C is a schematic cross-sectional view taken along the line III-III ′ of FIG. FIG. 5A is a schematic perspective view for explaining a manufacturing method of the liquid crystal display panel 100A. FIG. 5B is a schematic cross-sectional view taken along line IV-IV ′ of FIG. FIGS. 6A to 6G are schematic cross-sectional views illustrating a method for manufacturing the liquid crystal display panel 100A.

As shown in FIG. 4A, a first mother substrate 42 and a second mother substrate 43 are prepared. A plurality of TFT substrates 44 are formed on the first mother substrate 42. On each of the plurality of TFT substrates 44, for example, a p-Si TFT is formed for each pixel by a known method, and a horizontal alignment film is formed by a known method over almost the entire TFT substrate 44. A plurality of color filter substrates 45 having color filter layers are formed on the second mother substrate 43 by a known method, and a horizontal alignment film is formed by a known method over almost the entire color filter substrate 45.

Next, as shown in FIGS. 4B and 4C, a sealing material (for example, an ultraviolet curable resin) 8 is applied to each TFT substrate 44 (for the sake of simplicity, the same reference numerals as those of the sealing portion 8 are used. ). The sealing material 8 is applied so as to surround the display area 25 in which the plurality of pixel electrodes 46 are formed. At this time, a part of the sealing material 8 is formed between the display area 25 and the connection area 26, and the other part is separated from the display area 25 (for example, separated by 0.2 mm or more). .

Next, a mixed liquid in which a nematic liquid crystal material and a monomer are mixed is dropped into an area surrounded by the sealing material 8 by an ODF (One Drop Fill) method. At this time, the mass ratio of the nematic material to the monomer is 80:20 (nematic liquid crystal material: monomer = 80: 20). The mass ratio is not limited to this, and a mixed solution having a monomer concentration of 10% by mass to 30% by mass may be used. The polymer wall formed from the monomer is a region that does not contribute to display. Therefore, when the monomer concentration is less than 10% by mass, the transmittance of the liquid crystal display panel 100A, that is, the luminance of display increases, but the mechanical strength of the liquid crystal display panel 100A decreases. When the monomer concentration exceeds 30% by mass, the mechanical strength of the liquid crystal display panel 100A increases, but the transmittance of the liquid crystal display panel 100A, that is, the display brightness decreases. Further, since the sealing material 8 is provided so as to surround the display region 25, the dropped mixed liquid does not leak out of the sealing material 8.

Next, as shown in FIGS. 5A and 5B, after the first mother substrate 42 and the second mother substrate 43 are bonded together by a known method, the sealing material 8 and the display area 25 Each monomer is irradiated with ultraviolet rays to be cured. As a result, a liquid crystal layer 10 including a wall including a polymer and a liquid crystal region in a region surrounded by the sealant 8 is obtained. In this way, a first panel structure is obtained. The integrated light amount for curing the sealing material 8 and the monomer is about 1 to 4 J / cm ² for light having a wavelength of 365 nm, depending on the material.

Next, as shown in FIG. 6A, the polarizing plate 4 is attached to the surface on the observer side (the surface of the first substrate 1) of the first panel structure. Further, the laminate 50 formed by the method described above with reference to FIG. 3 on the surface on the back side of the first panel structure (the surface of the second substrate 2), the polarizing plate 6 is on the second substrate 2 side. Paste like so. At this time, it is preferable to align and bond the edges of the first panel structure and the edges of the

polarizing plates

4 and 6 when viewed from the normal direction of the first panel structure. Thereby, the 2nd panel structure 60 is obtained. Then, the 2nd panel structure 60 and the

polarizing plates

4 and 6 are made to adapt with an autoclave.

Thereafter, as shown in FIGS. 6B to 6E, the

polarizing plates

4 and 6 are cut using a blade 61 and the like, and the

substrates

1 and 2 are cut using a glass cutter 63 and the like.

Next, as shown in FIG. 6 (f), the

substrates

1 and 2 are pulled in the in-plane direction. Thereby, as shown in FIG.6 (g), the 2nd panel structure 60 can be divided | segmented for every liquid crystal display panel 100A.

In addition, when dividing for every liquid crystal display panel 100A, it is preferable that parts other than the part formed between the display area 25 and the connection area | region 26 among the seal parts 8 are cut off by division. Since the liquid crystal layer 10 in this embodiment has the liquid crystal region 11 partitioned by the wall containing the polymer, even if a part of the wall located between the adjacent liquid crystal regions is broken by the division, the liquid crystal layer 10 is broken. The liquid crystal material in the liquid crystal region 11 in contact with the wall only leaks out, and not all the liquid crystal material in the liquid crystal layer 10 leaks out.

Thereafter, the portion of the side surface of the liquid crystal display panel 100A where the seal portion 8 is not formed is sealed with a side surface sealing resin (not shown). The side surface sealing resin is made of, for example, an ultraviolet curable resin. In this way, the liquid crystal display panel 100A is obtained.

Subsequently, the liquid crystal display device 200A can be manufactured by disposing the backlight 110 on the back side of the liquid crystal display panel 100A.

In the above-described manufacturing method, a liquid crystal display panel is manufactured using a method in which a liquid mixture containing a nematic liquid crystal material and a monomer is dropped by an ODF method, but a method in which the liquid mixture is injected between substrates by a vacuum injection method is used. May be. In that case, after dividing the 2nd panel structure 60 after bonding the

polarizing plates

4 and 6, and forming a subpanel structure, you may inject | pour a liquid mixture between the board | substrates in each subpanel structure. . Thereafter, the sub panel structure is further divided to obtain the liquid crystal display panel 100A.

In the above method, the liquid crystal layer including the polymer wall is formed in the entire display region. However, the liquid crystal layer 10 may be formed so as to include the polymer wall only in the peripheral region of the liquid crystal layer 10. In this case, as shown in FIG. 7, a mixed liquid 30 in which a nematic liquid crystal material (for example, a negative nematic liquid crystal material) and a monomer are mixed is applied to each TFT substrate 44 of the first mother substrate by the ODF method. . At this time, the mixed liquid 30 is applied in the vicinity of the outer edge of the region where the pixel electrode of each TFT substrate 44 is formed. The weight ratio of the nematic liquid crystal material and the monomer is, for example, 80:20 (nematic liquid crystal material: monomer = 80: 20). A weight ratio is not limited to this, You may use the liquid mixture whose monomer concentration is 10 mass% or more and 30 mass% or less. When the monomer concentration is less than 10% by mass, the display contrast ratio of the liquid crystal display panel 100A increases, but the mechanical strength of the liquid crystal display panel 100A decreases. When the monomer concentration is more than 30% by mass, the mechanical strength of the liquid crystal display panel 100A increases, but the display contrast ratio and luminance of the liquid crystal display panel 100A decrease.

Next, a nematic liquid crystal material (for example, a negative nematic liquid crystal material) is applied to the region surrounded by the mixed liquid 30 in each TFT substrate 44 by the ODF method.

Thereafter, the first mother substrate including the TFT substrate 44 and the second mother substrate are bonded to each other by a known method, and then the monomer in the mixed solution 30 is irradiated with ultraviolet rays to be cured. Thus, a liquid crystal layer including a polymer wall only in the peripheral region is formed in each display region. Next, a polarizing plate and a fluorescent layer are formed by the same method as described above with reference to FIG. 5 to obtain a panel structure.

Subsequently, as described above with reference to FIG. 6, a plurality of liquid crystal display panels can be obtained by dividing the panel structure. At this time, if the peripheral region including the polymer wall in the liquid crystal layer is divided, the liquid crystal material can be prevented from leaking from the side surface of the liquid crystal display panel.

<Driving method of liquid crystal display panel 100A>
Next, a driving method of the liquid crystal display panel 100A in the present embodiment will be described.

Generally, a polarizing plate is not used in a liquid crystal display device (polymer dispersion type liquid crystal display device) using PDLC or PNLC. For example, since PDLC can switch the optical characteristics between a scattering state and a light transmission state by applying a voltage to the liquid crystal layer, it is possible to perform display without using a polarizing plate when PDLC is used. is there. In contrast, this embodiment uses the same material as PDLC but uses a polarizing plate. The polarizing plate may be a circular polarizing plate or a linear polarizing plate.

As an example, the structure and driving method of the liquid crystal display panel 100A having a linear polarizing plate will be described.

8A and 8B are a cross-sectional view and a partial plan view of the liquid crystal display panel 100A for explaining an example of a driving method.

In the illustrated example, the liquid crystal layer 10 includes a plurality of liquid crystal regions 11 and polymer walls 13. A liquid crystal material having a positive dielectric anisotropy is used as the material of the liquid crystal layer 10. Although not shown, a first horizontal alignment film is formed on the first substrate 1 so as to be in contact with the liquid crystal layer 10, and a second horizontal alignment film is formed on the second substrate 2 so as to be in contact with the liquid crystal layer 10. ing. Each liquid crystal region 11 is arranged in contact with these horizontal alignment films. A first polarizing plate is disposed on the first substrate 1, and a second polarizing plate is disposed on the second substrate 2. These polarizing plates are linear polarizing plates, and are arranged so that their absorption axes are orthogonal to each other (crossed Nicols). The first horizontal alignment film and the second horizontal alignment film are each subjected to an alignment process (for example, a rubbing process). The directions D1 and D2 of the alignment treatment of the first horizontal alignment film and the second horizontal alignment film are orthogonal to each other. Preferably, the alignment treatment direction D1 applied to the first horizontal alignment film is parallel to the transmission axis of the first polarizing plate, and the alignment treatment direction D2 applied to the second horizontal alignment film is the transmission axis of the second polarizing plate. And parallel. An electrode (for example, a common electrode) 15 is provided between the liquid crystal layer 10 and the first substrate 1, and an electrode (for example, a plurality of pixel electrodes) 14 is disposed between the liquid crystal layer 10 and the second substrate 2. Is provided.

In this driving method, when no voltage is applied, the tilt direction of the liquid crystal molecules included in each liquid crystal region 11 (particularly, the interface liquid crystal molecules located in the vicinity of the alignment film) is made different so that the viewing angle (polar angle) dependency depends on the viewing direction. Can be greatly reduced. A liquid crystal display panel (TN (Twisted Nematic) type liquid crystal display panel) having such a configuration is disclosed in International Publication No. 2010/044246 by the present applicant.

In addition, the liquid crystal display panel in this embodiment may have a circularly polarizing plate instead of the linearly polarizing plate. FIGS. 9A and 9B are a partial cross-sectional view and a plan view of a liquid crystal display panel 100B for explaining a driving method in the case of having a circularly polarizing plate.

In the liquid crystal display panel 100B illustrated in FIG. 9, as the first and second polarizing plates, linear polarizing plates arranged so that the absorption axes are orthogonal to each other are used, and between the first polarizing plate and the first substrate 1, A λ / 4 plate is disposed between the second polarizing plate and the second substrate 2. Each of the λ / 4 plate and the linearly polarizing plate functions as a circularly polarizing plate. In addition, the first and second horizontal alignment films on the first and second substrates are not subjected to alignment treatment. Further, the liquid crystal region 11 included in the liquid crystal layer 10 is in contact with only the horizontal alignment film formed on one of the

substrates

1 and 2. Other configurations are the same as those shown in FIG.

According to this driving method, since a plurality of liquid crystal regions 11 having directors oriented in different directions within a plane parallel to the liquid crystal layer can be arranged in the pixel, the viewing angle characteristics can be improved. A liquid crystal display panel having such a configuration is disclosed in International Publication No. 2009/069249 by the present applicant.

(Second Embodiment)
Hereinafter, a second embodiment of the liquid crystal display device according to the present invention will be described with reference to the drawings. The liquid crystal display device of this embodiment is different from the above-described embodiment in that a fluorescent layer containing a fluorescent dichroic dye is used.

FIG. 10A is a perspective view showing the fluorescent layer 12 and the polarizing plate 6 in the present embodiment. As shown in the drawing, the fluorescent layer 12 is formed on the surface of a polarizing plate 6 that is a linear polarizing plate, and is disposed on the back side of the liquid crystal display panel.

The fluorescent layer 12 has the dichroic fluorescent dye 22 uniaxially oriented so that the direction T of the transition moment of the dichroic fluorescent dye 22 is parallel to the direction P of the transmission axis of the polarizing plate 6. A method for controlling the orientation of the fluorescent dye will be described later.

Fluorescent substances other than dichroic fluorescent dyes (for example, transition metal ion-based rare earth ions, CaS-based, ZnS-based inorganic fluorescent substances, coumarin-based, cyanine-based, pyridine-based organic fluorescent dyes that do not have dichroism) System, rhodamine system, styryl system, anthraquinone system, rumogen system, body pea system, stilbene system), the phosphor layer emits isotropically. For this reason, only the light having an amplitude in the direction parallel to the transmission axis of the polarizing plate out of the light emitted from the fluorescent layer is transmitted through the polarizing plate and incident on the liquid crystal layer and used for display. Therefore, about half of the light incident on the polarizing plate from the fluorescent layer is not used for display, and it is difficult to increase the light use efficiency.

On the other hand, the fluorescent layer 12 in the present embodiment mainly emits light that oscillates in a direction parallel to the transition moment of the dichroic fluorescent dye 22. For this reason, most of the light emitted from the fluorescent layer 12 is transmitted through the polarizing plate 6 and can be used for display. Therefore, it is possible to increase the utilization efficiency of light (fluorescent light).

As the dichroic fluorescent dye, for example,

Etc. The fluorescent dye represented by the chemical formula (1) is 4,7

bisparamethoxyphenyl

2,1,3 benzothiadiazole (4,7-bis (p-methoxyphenyl) -2,1,3-benzothiadiazoles). This fluorescent dye has an absorption wavelength λ _A of 409 nm and a fluorescence emission wavelength λ _F of 542 nm. The fluorescent dye represented by the chemical formula (2) is 4,7

bisparamethoxymethylphenyl

2,1,3 benzothiadiazole (4,7-bis (p-methoxymethylphenyl) -2,1,3-benzothiadiazoles). This fluorescent dye has an absorption wavelength λ _A of 384 nm and a fluorescence emission wavelength λ _F of 505 nm. The fluorescent dye represented by the chemical formula (3) is 4,7

bisparamethoxycarbonylphenyl

2,1,3 benzothiadiazole (4,7-bis (p-methoxycarbenylphenyl) -2,1,3-benzothiadiazoles). This fluorescent dye has an absorption wavelength λ _A of 376 nm and a fluorescence emission wavelength λ _F of 464 nm. Each wavelength value is a value measured in dichloromethane.

FIGS. 10B and 10C are diagrams for explaining the absorption characteristics and emission characteristics of the P-type dichroic fluorescent dye, respectively.

As shown in FIG. 10B, in the fluorescent layer 12 in the present embodiment, the molecular axis of the P-type dichroic fluorescent dye 22 and the transition moment of absorption (absorption axis) are in the same direction T. For this reason, the absorption coefficient (A //) of light whose polarization direction is parallel to the molecular axis is larger than the absorption coefficient (A⊥) of light whose polarization direction is perpendicular to the molecular axis.

Further, as shown in FIG. 10C, the molecular axis of the P-type dichroic fluorescent dye 22 and the transition moment (luminescence axis) of fluorescence emission are directed in the same direction T. For this reason, the fluorescence emission coefficient (F //) of light whose polarization direction is parallel to the molecular axis is larger than the fluorescence emission coefficient (F⊥) of light whose polarization direction is perpendicular to the molecular axis.

FIG. 10 (d) is a diagram showing the wavelength dependence of the light absorption / emission intensity by the P-type dichroic fluorescent dye. The horizontal axis represents the light wavelength, and the vertical axis represents the intensity of the absorbed light and the emission intensity. Represents. From this figure, it can be seen that the dichroic fluorescent dye selectively absorbs light of a specific polarization direction (here, parallel to the molecular axis) and strongly emits fluorescence of the specific polarization direction.

Next, a method for manufacturing the liquid crystal display device of this embodiment will be described. Also in this embodiment, the laminated body 50 which provided the fluorescent film 12a on the surface of the polarizing plate film 6a is formed, and a liquid crystal display device is obtained using this laminated body 50. FIG.

Hereinafter, an example of a method of forming the stacked body 50 will be described with reference to FIG.

First, a fluorescent film 12a containing a dichroic fluorescent dye is produced. Next, the fluorescent film 12a is stretched, and the fluorescent dichroic dye contained in the fluorescent film 12a is aligned in the uniaxial direction (stretching direction) T. Thereafter, these films are bonded together to obtain a laminated film so that the transmission axis of the polarizing film 6a and the stretching direction T of the fluorescent film 12a are parallel to each other. Subsequently, the laminated film is cut into a predetermined size to obtain a laminated body 50. The polarizing film 6a preferably has a transmission axis in the longitudinal direction of the polarizing film 6a. As shown in the figure, the stretching process and the bonding process of the fluorescent film 12a may be performed continuously. A liquid crystal display device can be manufactured by using the laminate 50 thus obtained by the same method as described above with reference to FIGS.

The formation method of the fluorescent layer 12 in this embodiment is not limited to the above method. For example, the fluorescent layer 12 can be formed by applying a resin containing a dichroic fluorescent dye to the polarizing film 6a.

FIG. 12 is a diagram for explaining another method for forming the laminate 50 including the fluorescent layer 12 in the present embodiment.

First, the surface of the polarizing film 6a is rubbed in a direction P parallel to the transmission axis of the polarizing film 6a. Next, a resin (for example, a UV curable liquid crystalline polymer resin) containing a dichroic fluorescent dye is applied to the rubbed surface of the polarizing film 6a to obtain a resin film 12b '. Thereby, the molecular axes of the dichroic fluorescent dye and the liquid crystalline polymer can be aligned in the rubbing direction P. Next, the resin film 12b 'containing the liquid crystalline polymer resin and the dichroic fluorescent dye is cured by, for example, UV light irradiation. Thereby, the fluorescent film 12b is formed on the polarizing film 6a. Thereafter, the phosphor film 12b and the polarizing film 6a are cut at the same time to obtain a laminate 50 having a predetermined size. The polarizing film 6a preferably has a transmission axis in the longitudinal direction of the polarizing film 6a. As shown in the figure, the rubbing process of the polarizing film 6a, the resin coating process on the polarizing film 6a, and the curing process of the resin film 12b 'may be performed continuously. A liquid crystal display device can be manufactured by using the laminate 50 thus obtained by the same method as described above with reference to FIGS.

(Third embodiment)
Hereinafter, a third embodiment of the liquid crystal display device according to the present invention will be described with reference to the drawings. The liquid crystal display device of the present embodiment is different from the above-described embodiment in that the liquid crystal display device has a reflection portion on at least a part of the side surface of the liquid crystal display panel.

FIG. 13 is a cross-sectional view of the liquid crystal display device 200C of the present embodiment. For simplicity, the same components as those of the liquid crystal display device 200A shown in FIG.

The liquid crystal display device 200C includes a liquid crystal display panel 100C and a backlight 110. When the liquid crystal display panel 100C is viewed from the viewer side, at least a part of the outer edge of the fluorescent layer 12 is aligned with the outer edges of the first substrate 1, the second substrate 2, the

polarizing plates

4 and 6, and the liquid crystal layer 10. Yes. A reflecting portion 24 is provided along the aligned edge portion S. The reflection unit 24 is disposed so as to cover the side surfaces of the first substrate 1, the second substrate 2, the

polarizing plates

4 and 6, the liquid crystal layer 10, and the fluorescent layer 12. Preferably, the reflection part 24 is arrange | positioned so that these side surfaces may be contact | connected.

The reflection unit 24 may be provided on at least a part of the outer edge of the liquid crystal display panel 100C when the liquid crystal display panel 100C is viewed from the observer side. For example, the reflection part 24 may be provided along at least one side among the sides constituting the outer edge (for example, a substantially square shape) of the liquid crystal display panel 100C.

The reflection part 24 should just contain the material which reflects visible light, and the material and formation method are not specifically limited. For example, a high dielectric film or a metal film having a high reflectance may be formed as a part of the side surface of the liquid crystal display panel 100C as the reflection part 24. When a liquid crystal display panel is manufactured by the method described above with reference to FIG. 6, a high dielectric film or a metal film may be formed on at least a part of the cut surface of the liquid crystal display panel. Alternatively, the reflecting portion 24 can be formed by applying a paint containing metal flakes to at least a part of the side surface (or cut surface) of the liquid crystal display panel 100C. Instead, a reflective film may be attached to the side surface (or cut surface) of the liquid crystal display panel 100C.

According to this embodiment, the light emitted from the fluorescent layer 12 by the excitation light 120 from the backlight 110 can be prevented from leaking from the side surface of the liquid crystal display panel 100C to the outside of the liquid crystal display panel 100C (light leakage). Further, even when the frame area is narrowed, display defects at the peripheral edge of the display area 25 can be reduced. Hereinafter, the effects of the present embodiment will be described in more detail with reference to the drawings.

In the liquid crystal display panel having no reflective layer as described above, when the frame region is narrowed (or eliminated), as shown in FIG. 14A, a part L1 of the light emitted from the fluorescent layer 12 is displayed on the liquid crystal display. There is a risk of leakage from the side of the panel to the outside of the liquid crystal display panel. For this reason, the brightness at the peripheral edge of the liquid crystal display panel is lower than that at the center. As a result, the display becomes dark at the peripheral edge of the display area 25, and as a result, poor visibility may occur.

When there is no frame area, the width of the “display darkening range” 25P in the display area 25, that is, the distance x from the outer edge of the liquid crystal display panel to the innermost portion of the range 25P is the refraction of the liquid crystal display panel. When the rate is n and the thickness is h, the following formula is used.
x = h × tan {arcsin (1 / n)}

On the other hand, according to the present embodiment, as shown in FIG. 14B, the light L2 traveling from the side surface of the liquid crystal display panel 100C to the outside of the liquid crystal display panel 100C is reflected inside the liquid crystal display panel 100C. it can. Accordingly, it is possible to improve the brightness shortage at the peripheral edge of the liquid crystal display panel 100C. As a result, even when the frame region is not provided or the width of the frame region is less than the distance x, display unevenness in the peripheral portion of the display region 25 can be reduced, and display is performed with more uniform brightness in the entire display region 25. It becomes possible.

(Fourth embodiment)
Hereinafter, a fourth embodiment of a liquid crystal display device according to the present invention will be described with reference to the drawings. The liquid crystal display device of this embodiment is different from the above-described embodiment in that the amount of the fluorescent material contained in the peripheral portion of the fluorescent layer is larger than the amount contained in the central portion. The “amount of the fluorescent substance” here means the mass of the fluorescent substance per unit area of the fluorescent layer when viewed from the normal direction of the fluorescent layer.

15A and 15B are a cross-sectional view and a plan view of the liquid crystal display device 200D of the present embodiment, respectively. For simplicity, the same components as those of the liquid crystal display device 200A shown in FIG.

The liquid crystal display device 200D includes a liquid crystal display panel 100D and a backlight 110. In the liquid crystal display panel 100D in the present embodiment, the density of the fluorescent material in the fluorescent layer 12 is substantially uniform, but the thickness of the fluorescent layer 12 is larger at the peripheral part than at the central part. With such a configuration, since the amount of the fluorescent material can be increased at the peripheral portion of the fluorescent layer 12 as compared with the central portion, the light emission amount from the fluorescent layer 12 can be increased at the peripheral portion as compared with the central portion. Accordingly, display brightness non-uniformity due to light leakage on the side surface of the panel (FIG. 14A) can be reduced.

15B, when the liquid crystal display device 200D is viewed from the viewer side, the light guide plate 112 of the backlight 110 is smaller than the fluorescent layer 12, and the peripheral portion of the fluorescent layer 12 is the light guide plate. 112 does not have to overlap. In this case, if the region of the fluorescent layer 12 that is located within the display region 25 and does not overlap the light guide plate 112 (the light irradiating part of the light guide plate 112) is the region Z, it is included in the region Z of the fluorescent layer 12. It is preferable to increase the amount of the fluorescent substance more than the amount contained in other regions. Since the light guide plate 112 does not exist below the region Z, the amount of excitation light incident on the region Z of the fluorescent layer 12 is the amount of excitation light incident on another region (for example, the central portion) of the fluorescent layer 12. Less than. However, since the amount of the fluorescent substance contained in the region Z is increased, it is possible to emit the same amount of light as other regions even with a small amount of excitation light. For this reason, light can be emitted more uniformly over the entire surface of the fluorescent layer 12 regardless of the size and position of the light guide plate 112.

Next, a method for forming the fluorescent layer 12 in this embodiment will be described. FIG. 16 is a cross-sectional view for explaining an example of a method for forming the fluorescent layer 12.

The fluorescent layer 12 in the present embodiment includes, for example, a liquid crystalline polymer resin and a dichroic fluorescent dye.

First, rubbing is performed on the surface of the polarizing film 6a in a direction parallel to the transmission axis of the polarizing film 6a. Next, a UV curable liquid crystalline polymer resin containing a dichroic fluorescent dye is applied to the rubbed surface of the polarizing film 6a to obtain a resin film 12c '. Thereby, the molecular axes of the dichroic fluorescent dye and the liquid crystalline polymer can be aligned in the rubbing direction. At this time, the thickness of the resin film 12c 'is changed by controlling the coating amount. In this embodiment, it controls so that it may become thick in the part corresponding to the peripheral part of a panel.

Next, the resin film 12c 'containing the liquid crystalline polymer resin and the dichroic fluorescent dye is cured by, for example, irradiation with UV light, thereby forming the fluorescent film 12c on the polarizing film 6a. Thereafter, the fluorescent film 12c and the polarizing film 6a are simultaneously cut to obtain a laminate 50 having a predetermined size. The polarizing film 6a preferably has a transmission axis in the longitudinal direction of the polarizing film 6a. As shown in the drawing, the rubbing step of the polarizing film 6a, the step of applying the resin to the polarizing film 6a, and the curing step of the resin film 12c 'may be performed successively. The laminated body 50 obtained in this way is bonded so that the thick part of the fluorescent layer 12 and the end of the liquid crystal display panel overlap. Thereafter, the liquid crystal display device 200D can be manufactured by using a method similar to the method described above with reference to FIGS.

In addition, instead of making the thickness of the fluorescent layer 12 larger at the peripheral portion than at the central portion, the concentration of the fluorescent substance in the fluorescent layer 12 may be higher at the peripheral portion than at the central portion. Thereby, since the quantity of a fluorescent substance can be increased in a peripheral part, the effect which suppresses the display nonuniformity by the light leakage from a panel side surface is acquired. In particular, by increasing the concentration of the fluorescent substance in the region Z in the fluorescent layer 12 as compared with other regions, display unevenness due to non-uniformity in the amount of excitation light can be improved.

The fluorescent layers 12 having different concentrations can be formed by the following method, for example.

Prepare two types of resins with different concentrations of dichroic fluorescent dye. These resins are applied onto the polarizing film 6a that has been rubbed by the method described above with reference to FIG. At this time, the resin having the higher concentration of the dichroic fluorescent dye is applied on the portion corresponding to the peripheral portion of the panel, and the resin having the lower concentration is applied on the other portion. The subsequent steps are the same as those described above with reference to FIG.

(Fifth embodiment)
The liquid crystal display device of this embodiment is different from the above-described embodiment in that a method different from the driving method described above with reference to FIGS. 8 and 9 is used. Hereinafter, an example of using a driving method called an IPS (In Plane Switching) method and a FFS (Fringe Field Switching) method as a driving method of the liquid crystal display panel in the present embodiment will be described with reference to the drawings.

FIGS. 17A and 17B are a partial cross-sectional view and a partial plan view of a liquid crystal display panel 100E using the IPS method. For simplicity, the same components as those in FIGS. 8 and 9 are denoted by the same reference numerals, and description thereof is omitted.

In the liquid crystal display panel 100E, a pair of

comb electrodes

16a and 16b are formed on the second substrate 2 on the back side of the liquid crystal layer 10. No electrode is formed on the first substrate 1 on the viewer side of the liquid crystal layer 10. A horizontal alignment film (not shown) is formed on the surface of the first and

second substrates

1 and 2 on the liquid crystal layer side. These alignment films are subjected to an alignment process (for example, a rubbing process) so as to be parallel to each other when viewed from the normal direction of the panel. The orientation direction D3 is shown in FIG. The liquid crystal layer 10 includes a liquid crystal region 11 and a polymer wall 13. Each liquid crystal region 11 is preferably in contact with both the horizontal alignment films of the first and

second substrates

1 and 2. In addition, linear polarizers (not shown) are provided on the viewer side of the first substrate 1 and the back side of the second substrate 2, respectively. These linearly polarizing plates are arranged so that their absorption axes are orthogonal to each other (crossed Nicols). Further, either one of the absorption axes may coincide with the rubbing direction. In this method, the alignment state of the liquid crystal region 11 is controlled by a lateral electric field.

A vertical alignment film may be formed on the first substrate 1 and the second substrate 2 instead of forming the horizontal alignment film. The vertical alignment film is not subjected to alignment treatment. A liquid crystal material having a positive dielectric anisotropy is used as the material of the liquid crystal layer 10. A partial plan view of the liquid crystal display panel 100F in this case is shown in FIG. The cross-sectional view is the same as FIG.

19 (a) and 19 (b) are a partial cross-sectional view and a partial plan view of a liquid crystal display panel 100G using the FFS method. For simplicity, the same components as those in FIGS. 8 and 9 are denoted by the same reference numerals, and description thereof is omitted.

The liquid crystal display panel 100G includes a lower electrode 17 formed over almost the entire display area of the first substrate 1, an insulating layer 18 formed on the lower electrode 17, and a comb electrode 19 formed on the insulating layer 18. And have. No electrode is formed on the second substrate 2 on the viewer side of the liquid crystal layer 10. A horizontal alignment film (not shown) is formed on the surface of the first and

second substrates

1 and 2 on the liquid crystal layer side. These alignment films are subjected to an alignment process (for example, a rubbing process) so as to be parallel to each other when viewed from the normal direction of the panel. The orientation direction D4 is shown in FIG. The liquid crystal layer 10 includes a liquid crystal region 11 and a polymer wall 13. Each liquid crystal region 11 is preferably in contact with both the horizontal alignment films of the first and

second substrates

1 and 2. In addition, linear polarizers (not shown) are provided on the viewer side of the first substrate 1 and the back side of the second substrate 2, respectively. These linearly polarizing plates are arranged so that their absorption axes are orthogonal to each other (crossed Nicols). Further, either one of the absorption axes may coincide with the rubbing direction. In this method, as in the IPS method, the alignment state of the liquid crystal region 11 is controlled by a lateral electric field.

A vertical alignment film may be formed on the first substrate 1 and the second substrate 2 instead of forming the horizontal alignment film. The vertical alignment film is not subjected to alignment treatment. A liquid crystal material having a positive dielectric anisotropy is used as the material of the liquid crystal layer 10. A partial plan view of the liquid crystal display panel 100H in this case is shown in FIG. The cross-sectional view is the same as FIG.

The liquid crystal display device of the present invention is not limited to the liquid crystal display device of the above-described embodiment. For example, a fluorescent layer containing a dichroic fluorescent dye may be applied to the third to fifth embodiments. Thereby, the utilization efficiency of light can be further improved. Moreover, you may apply the reflection part 24 demonstrated in 3rd Embodiment to 4th Embodiment. Thereby, the fall of the display characteristic in the peripheral part of a display area can be suppressed more effectively. Furthermore, the drive system and electrode structure described in the fifth embodiment can be applied to the liquid crystal display device of any other embodiment.

The liquid crystal display device according to the embodiment of the present invention can be suitably applied to a multi-display system. For example, as shown in FIG. 21, a large display system 300 can be manufactured by arranging a plurality of liquid crystal display panels 101 to 104 side by side and providing a backlight (not shown) on the back side thereof. At this time, if the two adjacent liquid crystal display panels are arranged so that the side surfaces not having the frame region are in contact with each other, the frame is hardly visually recognized at the boundary portion between these panels, and continuous display can be realized. The liquid crystal display panels 101 to 104 may be any of the liquid crystal display panels 100A to 100H described above.

Furthermore, as shown in FIG. 22, it can be used for an electronic device 400 that can be spread like a book. The electronic device 400 includes, for example, two liquid

crystal display devices

201 and 202 having the same configuration. The liquid

crystal display devices

201 and 202 may be the liquid crystal display device of any of the above-described embodiments. These liquid

crystal display devices

201 and 202 are arranged so that side surfaces having no frame region are in contact with each other. Thereby, continuous display is realizable. Further, if the folding between the two liquid

crystal display devices

201 and 202 can be folded, the portability of the electronic device 400 can be improved.

Embodiments of the present invention are applicable not only to liquid crystal display devices and various electronic devices having the liquid crystal display devices, for example, small and medium devices such as electronic books, mobile phones, and smartphones, but also large devices such as multi-display systems. Can be done.

DESCRIPTION OF

SYMBOLS

1, 2

Substrate

4, 6 Polarizing plate 8 Seal part 10 Liquid crystal layer 11 Liquid crystal area 12 Fluorescent layer 13

Wall

14, 15 Electrode 25 Display area 27 Frame area 100A-100H Liquid crystal display panel 110 Back light 112

Light guide plate

200A, 200C, 200D Liquid crystal display

Claims

A liquid crystal display device comprising a liquid crystal display panel including a display region having a plurality of pixels, and a backlight disposed on the back side of the liquid crystal display panel,
The liquid crystal display panel is
A liquid crystal layer having a plurality of liquid crystal regions and a wall containing a polymer between adjacent liquid crystal regions of the plurality of liquid crystal regions;
A first substrate disposed on the viewer side of the liquid crystal layer;
A second substrate disposed on the back side of the liquid crystal layer;
A first polarizing plate formed on the first substrate;
A second polarizing plate formed on the second substrate;
A fluorescent layer disposed between the second polarizing plate and the backlight, and including a fluorescent material that emits visible light when excited by absorbing light of a predetermined wavelength;
The backlight has a light irradiation unit that irradiates the fluorescent layer with light of the predetermined wavelength,
When viewed from the normal direction of the liquid crystal display panel, at least one side of the outer edge of the phosphor layer is one side of the outer edge of the first and second polarizing plates and one side of the outer edge of the first and second substrates. Aligned liquid crystal display device.
The liquid crystal display device according to claim 1, wherein when viewed from the normal direction of the liquid crystal display panel, the at least one side of the outer edge of the fluorescent layer is aligned with one side of the outer edge of the liquid crystal layer.
The backlight includes a light guide plate,
The light irradiation unit is disposed on a surface of the light guide plate facing the fluorescent layer,
3. The liquid crystal display device according to claim 1, wherein in the display region, a part of the fluorescent layer does not overlap the light irradiation part of the light guide plate.
The fluorescent material includes a dichroic fluorescent dye;
4. The liquid crystal display device according to claim 1, wherein in the fluorescent layer, a direction of a transition moment of the dichroic fluorescent dye is parallel to a direction of a transmission axis of the second polarizing plate.
The liquid crystal display panel further includes a reflective portion disposed on at least a part of a side surface of the liquid crystal display panel,
5. The liquid crystal display device according to claim 1, wherein the reflection portion is disposed along the at least one side of the outer edge of the fluorescent layer when viewed from a normal direction of the liquid crystal display panel.
6. The liquid crystal display device according to claim 1, wherein the thickness of the fluorescent layer is larger at the first portion located at the periphery of the fluorescent layer than at the central portion.
6. The liquid crystal display device according to claim 1, wherein the concentration of the fluorescent substance in the fluorescent layer is higher in the first portion located at the periphery of the fluorescent layer than in the central portion.
The liquid crystal display device according to claim 6 or 7, wherein the first portion of the fluorescent layer does not overlap the light irradiation unit, and the central portion of the fluorescent layer overlaps the light irradiation unit.
The first alignment film and the second alignment film, which are formed between the liquid crystal layer and the first substrate and the second substrate, respectively, are formed so as to be in contact with the liquid crystal layer, respectively. The liquid crystal display device according to claim 8.
When viewed from the normal direction of the liquid crystal display panel, a seal portion is not provided along at least one side of the outer edge of the liquid crystal layer, and the at least one side of the outer edge of the liquid crystal layer is not provided with the seal portion. The liquid crystal display device according to claim 1, which is aligned with the at least one side of the outer edge of the fluorescent layer.
(A1) A step of forming a fluorescent film containing a fluorescent substance that emits visible light when excited by absorbing light of a predetermined wavelength on the surface of the polarizing film, and obtains a laminated film including the polarizing film and the fluorescent film When,
(A2) a step of obtaining a laminate including a polarizing plate and a fluorescent layer by cutting the laminated film;
(B) A polymer is formed between the first substrate and the second substrate, the first substrate and the second substrate, and a plurality of liquid crystal regions and an adjacent liquid crystal region among the plurality of liquid crystal regions. Forming a first panel structure including a liquid crystal layer having a wall including;
(C) The laminated body is placed on the second substrate of the first panel structure so that the polarizing plate is on the first panel structure side, and another polarizing film is placed on the first substrate. A step of obtaining a second panel structure by installing;
(D) obtaining a liquid crystal display panel by cutting the second panel structure into a predetermined size;
(E) A method of manufacturing a liquid crystal display device including a step of disposing a backlight having a light irradiation unit for irradiating the liquid crystal display panel with light of the predetermined wavelength on the back side of the liquid crystal display panel.
(A1) A step of forming a fluorescent film containing a fluorescent substance that emits visible light when excited by absorbing light of a predetermined wavelength on the surface of the polarizing film, and obtains a laminated film including the polarizing film and the fluorescent film When,
(A2) a step of obtaining a laminate including a polarizing plate and a fluorescent layer by cutting the laminated film;
(B) A polymer is formed between the first substrate and the second substrate, the first substrate and the second substrate, and a plurality of liquid crystal regions and an adjacent liquid crystal region among the plurality of liquid crystal regions. Forming a first panel structure including a liquid crystal layer having a wall including;
(C) cutting the first panel structure into a predetermined size;
(D) The stacked body is installed on the second substrate of the cut out first panel structure so that the polarizing plate is on the second panel structure side, and another polarizing plate is installed on the first substrate. To obtain a liquid crystal display panel;
(E) A method of manufacturing a liquid crystal display device including a step of disposing a backlight having a light irradiation unit for irradiating the liquid crystal display panel with light of the predetermined wavelength on the back side of the liquid crystal display panel.
The fluorescent material includes a dichroic fluorescent dye;
In the step (A1), the fluorescent film is formed on the surface of the polarizing film so that the transmission axis direction of the polarizing film is parallel to the transition moment direction of the dichroic fluorescent dye. The manufacturing method of the liquid crystal display device of Claim 11 or 12 including the process to carry out.
The step (A1)
Preparing a fluorescent film containing the dichroic fluorescent dye;
Stretching the fluorescent film in a predetermined direction;
The process of forming the said fluorescent film by bonding the said fluorescent film with the surface of the said polarizing film so that the said extending | stretching direction and the transmission axis of the said polarizing film may become parallel. A method for manufacturing a liquid crystal display device.
The step (A1)
A process of rubbing the surface of the polarizing film in a direction parallel to the transmission axis of the polarizing film,
The method for manufacturing a liquid crystal display device according to claim 13, further comprising: forming the fluorescent film by applying a resin containing the fluorescent dye to the surface subjected to the rubbing treatment and then curing the resin.
The step (A1) includes a step of forming the phosphor film such that the thickness of the phosphor film is increased at a predetermined portion,
The method for manufacturing a liquid crystal display device according to claim 11, wherein the predetermined portion is located at a periphery of the fluorescent layer in the liquid crystal display panel.
The step (A1) includes a step of forming the fluorescent film so that the concentration of the fluorescent substance in the fluorescent film is high at a predetermined portion, and the predetermined portion includes the fluorescent layer in the liquid crystal display panel. The manufacturing method of the liquid crystal display device in any one of Claim 11 to 15 located in the periphery of.
The method for manufacturing a liquid crystal display device according to any one of claims 11 to 17, further comprising a step of forming a reflection portion so as to cover at least a part of a side surface of the liquid crystal display panel.