JP2820843B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light receiving type liquid crystal display device having a backlight (backlight).

[0002]

2. Description of the Related Art In the conventional liquid crystal display device, there is a strong demand from the market for a reduction in thickness, and accordingly, a liquid crystal display device equipped with a light guide plate (light guide) type liquid crystal lighting device (backlight system). Equipment is mainstream. This liquid crystal display device is, as shown in FIGS.
PMMA (polymethyl methacrylate), quartz glass, or the like is used as the light guide plate 1 having excellent translucency.
In addition, a cold cathode tube (CCFT) or a hot cathode tube (HCFT) is used as a light source 2 (lamp) in order to uniformly propagate light in the light guide plate 1.

Further, in order to make the light emitted from the light source 2 efficiently enter the light guide plate 1, a high-reflectance silver-deposited film or a resin molded product is generally used as the lamp reflector 3. .

[0004] In FIGS. 17 to 19, reference numeral 4 denotes a diffusion film for diffusing light from the light guide plate 1, 5 denotes a reflection film for reflecting backward light in the light guide plate 1 to the diffusion film 4, and Bo denotes a reflection film. Denotes a liquid crystal display panel. Reference numeral 6 denotes a light scattering material applied to the front surface of the reflection film 5, which is printed by using a white material such as TiO ₂ . Conventionally, when the size of the light guide plate 1 is 192 mm in length and 146 mm in width, the formation region of the light scattering material is 190.4 mm in length and 144.8 mm in width.

[0005]

However, as the market demands for thinner and more compact liquid crystal display devices, the distance between the liquid crystal display effective area DA and the light source 2 shown in FIG. As a result, the luminance is high near the light incident end face of the light guide plate, and the uniformity (uniformity) of the luminance is degraded. In particular, the light emission of the light guide plate 1 close to the light source 2 as a unit of the liquid crystal display device. The effect of heat and light leaks from the light source 2 on the surface was remarkable, resulting in a decrease in display quality (white spot phenomenon) at the end of the liquid crystal display effective area DA on the side where the light source was arranged.

That is, as shown in FIG. 20, when the display is viewed at the upper viewing angle (12:00 viewing angle) X1 in the effective display area DA by the conventional method, as shown in FIG. Are scattered and compared with the light L1 when the scattering film 6 is not provided,
The liquid crystal display panel Bo can easily advance forward outside the effective display area DA. This has contributed to the whitening phenomenon caused by the light leakage at the end of the liquid crystal effective display area DA on the side where the light source 2 is arranged.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device capable of preventing and reducing a decrease in display quality at an end of a liquid crystal display effective area DA accompanying a reduction in thickness and size of the liquid crystal display device.

[0008]

SUMMARY in accordance with the present onset bright Means for Solving the Problems] are as shown in FIG. 13 to FIG. 15, the liquid crystal display panel 11,
A light guide plate 12 arranged in parallel behind the liquid crystal display panel 11 to illuminate the same; and a light source 1 arranged at an end of the light guide plate 12
3, a reflection film 16 for reflecting light backward in the light guide plate 12 forward, and a light scattering material 17 in a dot pattern for scattering light backward on the front surface of the reflection film 16. In the provided liquid crystal display device, the formation area of the light scattering material 17 was limited to the liquid crystal display effective area DA of the light guide plate 12 or slightly larger than this, and the reflectance was suppressed on the outer periphery of the light scattering material 17. The sub-scattering material 23 is formed.
Are light scattering pattern dots 24 of the same material as the light scattering material 17 and black body pattern dots 2 alternately arranged with the light scattering pattern dots 24.
5.

Further, a lamp reflector 18 that reflects light emanating outwardly from the light source 13 disposed around the light guide plate 12 side of the light source 13 directs a light emitted forward from the light guide plate 12 to the liquid crystal panel 11 And a diffusion film 14 for diffusing the light, the size of the formation area of the diffusion film 14 is set to be slightly larger than the liquid crystal display effective area DA, and the lamp reflector 18 is provided at the front end of the light guide plate 12. A part of the front surface of the light guide plate 12 is exposed at a portion where the lamp reflector 18 and the diffusion film 14 are separated from each other and is directly adhered to the diffusion film 14.

Further , a lamp reflector 18 disposed around the light source 13 and reflecting light diverging outward from the light source 13 toward the light guide plate 12, and light emitted forward from the light guide plate 12 to the liquid crystal display panel 11. Diffusion film 14 that diffuses toward
The size of the formation area of the diffusion film 14 is set to be slightly larger than the liquid crystal display effective area DA, the lamp reflector 18 is directly adhered to the front end of the light guide plate 12, and Being disposed apart from the diffusion film 14,
A black black body layer 15 is formed directly on the front surface of the light guide plate 12 at a portion where the lamp reflector 18 and the diffusion film 14 are separated from each other.

[0011]

In the above-mentioned means for solving the above problems , all light reflections on the back surface of the light guide plate 12 corresponding to outside the liquid crystal display effective area DA are mirror reflections only by the reflection film 16 on the back surface of the light guide plate 12, and the light source 13 is provided. Light reflection between the light incident end face of the light guide plate 12 on the side and the liquid crystal display effective area DA is all propagated inside the light guide plate 12 in the specular reflection mode. Therefore, the light reflected on the back surface of the light guide plate 12 is only totally reflected toward the inside of the light guide plate 12 unless it is scattered by the light scattering material 17, and goes out of the light guide plate 12 immediately before the total reflection position. The ratio of entering the market decreases. Accordingly, it is possible to prevent light from concentrating on the end of the liquid crystal display effective area DA on the side where the light source 13 is arranged, and it is possible to prevent a whitening phenomenon caused by light leakage. Then , even if the front end of the light guide plate 12 is exposed, local light conduction at the end is lost.

[0012] and, in providing the sub-scattering material 23
Thus , at the end outside the liquid crystal display effective area DA, light reflection on the rear surface of the light guide plate 12 can be suppressed.

Also, the light enters the light guide plate 12 from the light source 13.
Some of the reflected light is reflected by the angle of refraction in the light guide plate 12.
Therefore, let's advance directly to the diffusion film 14 before total reflection.
And However, on the front surface of the light guide plate 12, a liquid crystal display
Since the black body layer 15 is provided at the end of the effective area DA,
This absorbs and absorbs heat, reducing heat transfer. Accordingly
At the end of the liquid crystal display effective area DA of the liquid crystal display panel 11.
The whitening phenomenon can be prevented.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A liquid crystal display device according to a first embodiment of the present invention is a light guide plate 1 arranged in parallel behind a liquid crystal display panel (not shown) to illuminate the same.
2 and a light source 13 disposed at an end of the light guide plate 12 as shown in FIGS.

The light guide plate 12, as shown in FIGS.
It is formed into a flat plate having a length of 205 mm, a width of 155 mm, and a thickness of 6 mm using MA (polymethyl methacrylate), quartz glass, or the like. The liquid crystal display effective area D of the light guide plate 12
A depends on the display effective area of the liquid crystal display panel used, but in this embodiment, for example, the length is 182.4 mm and the width is 13
It is set to 6.8 mm.

On the front surface of the light guide plate 12, a thickness of 0.25 mm for diffusing light from the light guide plate 12 toward the liquid crystal display panel is provided.
The existing diffusion film 14 is stretched.

Then, a black black body layer 15 is formed on the light emitting surface of the diffusion film 14 outside the liquid crystal display effective area DA. As the black body layer 15, a commercially available synthetic resin black adhesive tape or the like is used. Here, the use of the black material is in consideration of the fact that the entire black substance has light absorption and heat absorption.

As shown in FIGS. 1 and 2, the light source 13 uses a tubular cold cathode tube (CCFT) or a hot cathode tube (HCFT), and is disposed at both ends of the light guide plate 12 in the long side direction.
Here, the liquid crystal display effective area D of the light source 13 and the light guide plate 12 is set.
The distance from A is reduced as much as possible in view of the demand for thinner and more compact liquid crystal display devices.

In FIG. 1 and FIG. 2, reference numeral 16 denotes a white reflection film for reflecting light backward in the light guide plate 12 to the diffusion film 14 side. Reference numeral 17 denotes a light scattering material applied to the front surface of the reflection film 16, which is printed by using a white material such as TiO ₂ .

In the above configuration, when the light source 13 emits light, the light enters the light guide plate 12 and advances forward while repeating total internal reflection. After being diffused by the diffusion film 14, a liquid crystal display panel (not shown) is illuminated.

Here, as described above, the light source 13 and the light guide plate 1 are used.
Since the distance from the liquid crystal display effective area DA of No. 2 is shortened as much as possible, some of the light from the light source 13
Due to the refraction angle in the light guide plate 12, an attempt is made to directly enter the diffusion film 14 before total reflection. Then, heat is directly transmitted to the liquid crystal display panel, and a whitening phenomenon occurs at an end of the liquid crystal display effective area DA.

However, in the present embodiment, since the black body layer 15 is disposed at the end of the liquid crystal display effective area DA, this absorbs and absorbs heat, thereby reducing heat transmission. Therefore, the whitening phenomenon at the end of the liquid crystal display effective area DA of the liquid crystal display panel can be prevented.

(Second Embodiment) As shown in FIG. 3, a liquid crystal display device according to a second embodiment of the present invention is made of TiO ₂ or the like that scatters and reflects light backward in the light guide plate 12 to the diffusion film 14 side. The area where the white light-scattering material 17 is formed is limited to the liquid crystal display effective area DA of the light guide plate 12 and is subjected to pattern printing.

The light guide plate 12 of this embodiment has a length of, for example, 19 mm.
Those having a size of 2 mm, a width of 146 mm and a thickness of 6 mm are used.

The liquid crystal display effective area DA of this embodiment is
Means that the dot pitch of the liquid crystal display panel is 0.285 mm × 0.
182.4 mm length and 13 width when 285 mm
6.8 mm. Along with this, the formation region of the light scattering material 17 of this embodiment has a length of 182.4 mm and a width of 136.
8 mm.

As the light source 13, two cold cathode tubes having a diameter of 4 mm and a tube length of 230 mm are used.

In FIG. 3, reference numeral 18 denotes a lamp reflector, such as a silver vapor-deposited film, which is disposed around the light source 13 and reflects light diverging outward from the light source 13 to the light guide plate 12 side.

As described above, when the pattern printing area of the light scattering material 17 on the back surface of the light guide plate 12 is made to match the size of the liquid crystal display effective area DA, the light propagation mode in the light guide plate 12 becomes as shown in FIG.
It is as shown in.

That is, the light reflection on the back surface of the light guide plate 12 corresponding to the outside of the liquid crystal display effective area DA is completely reduced.
Mirror reflection only by the reflection film 16 on the back surface of
The light reflection between the light incident end face of the light guide plate 12 on the side where 3 is disposed and the liquid crystal display effective area DA is all propagated inside the light guide plate 12 in the specular reflection mode. Therefore, the light guide plate 1
The light reflected on the back surface of the light guide plate 2 is only totally reflected toward the inside of the light guide plate 12 unless it is scattered by the light scattering material 17.
The proportion of the light reflected from the light guide plate 12 immediately before the total reflection position is reduced. Accordingly, it is possible to prevent light from concentrating on the end of the liquid crystal display effective area DA on the side where the light source 13 is arranged, and it is possible to prevent a whitening phenomenon caused by light leakage.

(Third Embodiment) As shown in FIG. 5, a liquid crystal display device according to a third embodiment of the present invention comprises a liquid crystal display panel 11 using thin transistors for monochrome display and color display, and a liquid crystal display panel 11 of this type. A light guide plate 12 arranged in parallel behind and illuminating the light guide plate;
And a light amount adjusting member 21 for uniformly adjusting the amount of emitted light between the liquid crystal display panel 11 and the light guide plate 12.

The light guide plate 12 has a length of 19 using PMMA (polymethyl methacrylate), quartz glass or the like.
It is formed in a flat plate shape of 8.7 mm, width of 159.8 mm and thickness of 6 mm. The liquid crystal display effective area DA of the light guide plate 12 is:
In this embodiment, for example, the length is 182.4 mm and the width is 13 mm depending on the display effective area of the liquid crystal display panel 11 used.
It is set to 6.8 mm.

On the front surface of the light guide plate 12, a thickness of 0.25 for diffusing light from the light guide plate 12 toward the liquid crystal display panel 11 is provided.
The existing diffusion film 14 of mm is stuck.

As the light source 13, a tubular cold cathode tube (CCFT) or hot cathode tube (HCFT) having a diameter of 4 mm is used.
The light guide plate 12 is disposed at both ends in the long side direction. Here, the distance between the light source 13 and the liquid crystal display effective area DA of the light guide plate 12 is reduced as much as possible in view of the demand for a thin and compact liquid crystal display device.

The light quantity adjusting member 21 is formed by forming a light scattering reflector 22 made of Ag or TiO ₂ on a sheet made of polyethylene terephthalate (PET) in a dot (scattered) pattern. Near the end of the display effective area DA, the density of the light scattering reflector 22 is formed high.

In the above configuration, when the light source 13 emits light, the light enters the light guide plate 12 and advances forward while repeating total internal reflection. After being diffused by the diffusion film 14, the liquid crystal display panel 11 is illuminated.

Here, as described above, the light source 13 and the light guide plate 1
Since the distance from the liquid crystal display effective area DA of No. 2 is shortened as much as possible, some of the light from the light source 13
Depending on the angle of refraction in the light guide plate 12, the light leaks directly to the diffusion film 14 before the light is totally reflected and tries to enter. Then, heat is directly transmitted to the liquid crystal display panel 11, and a whitening phenomenon occurs at an end of the liquid crystal display effective area DA.

However, in the present embodiment, the light amount adjusting member 21 for uniformly adjusting the amount of emitted light is interposed between the liquid crystal display plate 11 and the light guide plate 12, and light scattering is particularly generated near the end of the liquid crystal display effective area DA. Due to the formation of the reflector 22, this reduces the local transmission of light and heat. Therefore, the whitening phenomenon at the end of the liquid crystal display effective area DA of the liquid crystal display panel 11 can be prevented.

(Fourth Embodiment) The liquid crystal display device of the present embodiment differs from the third embodiment in that FIG.
Also, as shown in FIG. 7, there is no intervening light amount adjuster 21 for uniformly adjusting the amount of emitted light between the liquid crystal display panel 11 and the light guide plate 12, and a light scattering reflector near the end of the liquid crystal display effective area DA. 22 is formed by patterning directly on the diffusion film 14.

According to this embodiment as well, local transmission of light and heat can be reduced by the light scattering reflector 22, and the liquid crystal display panel 1
The whitening phenomenon at the end of the liquid crystal display effective area DA can be prevented.

(Fifth Embodiment) In the liquid crystal display device of the present embodiment, the formation region of the white light scattering material 17 such as TiO ₂ is as shown by the hatched portion in FIG.
The area is smaller than the liquid crystal display effective area DA of No. 2 or the same area as shown in FIG. Specifically, the relationship between the dimension α of the light scattering material 17 and the dimension β of the liquid crystal display effective area DA is as follows: α ≦ β ≦ α + 2 (mm) (1) Have been.

Further, the lamp reflector 18 and the light guide plate 12
A black body layer 15 having a predetermined width is formed between the light guide plate 12 and the outside of the liquid crystal display effective area DA of the diffusion film 14. As the black body layer 15, a commercially available black double-sided adhesive tape made of synthetic resin or the like is used. Here, the use of the black material is in consideration of the fact that the entire black substance has light absorption and heat absorption.

In the above configuration, when the light source 13 emits light, the light enters into the light guide plate 12 and advances forward while repeating total internal reflection. After being diffused by the diffusion film 14, the liquid crystal display panel 11 is illuminated.

Here, depending on the refraction angle in the light guide plate 12, some of the light from the light source 13 tries to directly enter the diffusion film 14 before being totally reflected.

However, in the present embodiment, since the black body layer 15 is disposed at the end of the liquid crystal display effective area DA, this absorbs and absorbs heat, thereby reducing heat transmission. Therefore, the whitening phenomenon at the end of the liquid crystal display effective area DA of the liquid crystal display panel 11 can be prevented.

Also, since the pattern printing area of the light scattering material 17 on the back surface of the light guide plate 12 is limited to the inside of the liquid crystal display effective area DA, the pattern printing area on the back surface of the light guide plate 12 corresponding to outside the liquid crystal display effective area DA is limited. All light reflections are specular reflections only by the reflection film 16 on the back surface of the light guide plate 12, and all light reflections between the light incident end face of the light guide plate 12 on the side where the light source 13 is disposed and the liquid crystal display effective area DA are mirror reflections. Light is propagated inside the light guide plate 12 in the reflection mode.

Therefore, the light reflected on the back surface of the light guide plate 12 is only totally reflected toward the inside of the light guide plate 12 unless it is scattered by the light scattering material 17. The ratio of entering outside 12 decreases. Accordingly, it is possible to prevent light from concentrating on the end of the liquid crystal display effective area DA on the side where the light source 13 is arranged, and it is possible to prevent a whitening phenomenon caused by light leakage.

(Sixth Embodiment) In the liquid crystal display device of the present embodiment, as shown in FIGS. 10 and 11, the formation region of the light scattering material 17 on the back surface of the light guide plate 12 is as shown in the above-mentioned formula (1). Liquid crystal display effective area D of light guide plate 12
The black black body layer 15 is formed in a predetermined band width outside the liquid crystal display effective area DA on the back surface of the light guide plate 12.

In the present embodiment, since the black body layer 15 absorbs and absorbs heat at the end of the back surface of the light guide plate 12, heat transfer to the end of the liquid crystal display panel 11 can be reduced. Therefore,
The whitening phenomenon at the end of the liquid crystal display effective area DA of the liquid crystal display panel 11 can be prevented.

(Seventh Embodiment) As shown in FIG. 12, the liquid crystal display device of this embodiment
The formation area of the light scattering material 17 on the back surface of the light guide plate 12 is limited to the liquid crystal display effective area DA of the light guide plate 12 as in the above-mentioned formula (1).
The lamp reflector 18 is set to be slightly larger than this so as to cover the lamp reflector A, is directly adhered to the front end of the light guide plate 12, and is arranged at a distance from the diffusion film 14. A part of the front surface of the light guide plate 12 is exposed at a part where the light guide plate 12 is separated from the diffusion film 14. The exposed width of the front surface of the light guide plate 12 is about 2 m.
m is desirable.

In this embodiment, the pattern printing area of the light scattering material 17 on the back surface of the light guide plate 12 is limited to the inside of the liquid crystal display effective area DA. The light reflection on the back surface is all specular reflection only by the reflection film 16 on the back surface of the light guide plate 12, and the light source 13
The light reflection between the light incident end face of the light guide plate 12 on the side where is disposed and the liquid crystal display effective area DA is all propagated inside the light guide plate 12 in the specular reflection mode. That is, the light reflected on the back surface of the light guide plate 12 is only totally reflected toward the inside of the light guide plate 12 unless it is scattered by the light scattering material 17, and goes out of the light guide plate 12 immediately before the total reflection position. The ratio of entering the market decreases.

Therefore, as shown in FIG.
Even when the front end portion of the light emitting device is exposed, light does not concentrate on the front end portion, and the whitening phenomenon caused by light leakage does not matter.
Then, when the lamp reflector 18 is attached, not so much precision is required, and the manufacturing operation becomes easy.

(Eighth Embodiment) As shown in FIGS. 13 to 15, a liquid crystal display device of this embodiment
The formation area of the light scattering material 17 such as O ₂ is limited to the liquid crystal display effective area DA of the light guide plate 12 or slightly larger than this, as shown in the equation (1). The formed sub-scattering material 23 is formed in a band shape.

The sub-scattering material 23 is formed by regularly and uniformly arranging light scattering pattern dots 24 of the same material as the light scattering material 17 and black body pattern dots 25 alternately arranged one by one. . The formation width of the sub-scattering material 23 is about 1 mm, and the sub-scattering material 23 is continuously formed on the light scattering material 17.

The light guide plate 12 of this embodiment has a length of, for example, 200 mm, a width of 159.8 mm, and a thickness of 6 mm. As the liquid crystal display effective area DA, for example, a length of 182.4 mm, a width of 136. When it is set to 8 mm, the dot pattern size of the light scattering material 17 is the length 18
It is 2.9 mm and 137.3 mm in width.

As the light source 13, a cold cathode tube having a tube diameter of 4 mm was used, and the distance between one end face of the light guide plate 12 and the light source 13 was 2.5 mm.

Further, in the present embodiment, as in the seventh embodiment, the size of the area where the diffusion film 14 is formed is limited to the liquid crystal display effective area D.
A lamp reflector 18 is set to be slightly larger than this so as to cover A, the lamp reflector 18 is directly adhered to the front end of the light guide plate 12, and is arranged at a distance from the diffusion film 14. A part of the front surface of the light guide plate 12 is exposed at the separated portion of the film 14. The exposed width of the front surface of the light guide plate 12 is preferably about 2 mm.

The sub-scattering material 23 of this embodiment has a lower reflectance than the light-scattering material 17 by the amount of the black body pattern dots 25 provided, and the light advances forward at the end of the back surface of the light guide plate 12. Is reduced. Then, heat transfer to the edge of the liquid crystal display panel 11 can be reduced, and the whitening phenomenon at the edge of the liquid crystal display effective area DA of the liquid crystal display panel 11 can be prevented.

(Ninth Embodiment) As shown in FIG. 16, the liquid crystal display device of this embodiment has
The eighth embodiment is characterized in that the formation region of the seventh embodiment is slightly larger than the liquid crystal display effective region DA, and the sub-scattering material 23 having a suppressed reflectance is formed in a strip shape on the outer periphery of the light scattering material 17. In the same manner as described above, a black black body layer 15 is formed on the front surface of the light guide plate 12 in a space between the lamp reflector 18 and the diffusion film 14.
Is formed.

According to the present embodiment, the heat transfer to the liquid crystal display panel 11 can be further reduced by the provision of the black body layer 15.

Note that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made to the above-described embodiment within the scope of the present invention.

For example, in the above embodiment, TiO ₂ was used as the light scattering material 17, but the invention is not limited to this, and any material having strong scattering properties may be used.

The side on which the light source is arranged is not limited to the long side, and the same applies to the short side and the single-light system.

Further, the black body layer 15 is not limited to the black body tape, and may have a color designation close to black, such as gray.

Further, by combining the third embodiment and the fourth embodiment, the pattern printing area of the light scattering material 17 on the back surface of the light guide plate 12 is provided while the black layer 15 is provided. it may be matched to the dimensions.

[0065]

As is clear from the above description, according to the present invention, when the light source and the effective area of the liquid crystal display are to be brought close to each other as the liquid crystal display becomes thinner and more compact ,
Limit the formation region of the light-scattering material in a liquid crystal display effective region of the light guide plate, forming a black layer of the black sub-scattering material in the vicinity of the end portion of the liquid crystal display effective region or patterned, outside the liquid crystal display enable region
As a result, local heat conduction to the liquid crystal display panel can be reduced. Therefore, the whitening phenomenon at the end of the liquid crystal display panel can be prevented and the display quality can be improved.

Even if the front end of the light guide plate is exposed,
Light does not concentrate here, and the whitening phenomenon caused by light leakage does not matter. In this case, there is an excellent effect that the precision does not need to be so high when the lamp reflector is attached, and the manufacturing operation becomes easy.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a liquid crystal display device according to a first embodiment of the present invention.

FIG. 3 is a schematic sectional view showing a liquid crystal display device according to a second embodiment of the present invention.

FIG. 4 is a partially enlarged side view showing a liquid crystal display device according to a second embodiment of the present invention.

FIG. 5 is a schematic sectional view showing a liquid crystal display device according to a third embodiment of the present invention.

FIG. 6 is a schematic sectional view showing a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 7 is a partially enlarged sectional view showing a liquid crystal display device according to a fourth embodiment of the present invention.

8A and 8B are diagrams showing a liquid crystal display device according to a fifth embodiment of the present invention, wherein FIG. 8A is a side view and FIG.

FIG. 9 is a partially enlarged sectional view showing a liquid crystal display device according to a fifth embodiment of the present invention.

FIG. 10 is a schematic sectional view showing a liquid crystal display device according to a sixth embodiment of the present invention.

FIG. 11 is a partially enlarged sectional view showing a liquid crystal display device according to a sixth embodiment of the present invention.

FIG. 12 is a partially enlarged sectional view showing a liquid crystal display device according to a seventh embodiment of the present invention.

FIG. 13 is a schematic sectional view showing a liquid crystal display device according to an eighth embodiment of the present invention.

FIG. 14 is a perspective view showing a positional relationship among a light guide plate, a light scattering material, and a sub-scattering material according to an eighth embodiment of the present invention.

FIG. 15 is an enlarged view of a sub-scattering material.

FIG. 16 is a schematic sectional view showing a liquid crystal display device according to a ninth embodiment of the present invention.

FIG. 17 is a schematic perspective view showing a conventional liquid crystal display device.

FIG. 18 is a schematic sectional view showing a conventional liquid crystal display device.

FIG. 19 is a view showing a conventional liquid crystal display device,
(A) is a side view, (B) is a front view

FIG. 20 is an external perspective view of a general liquid crystal display device.

FIG. 21 is a view showing a state of light reflection outside a liquid crystal display effective area of a conventional light guide plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Liquid crystal display board 12 Light guide plate 13 Light source 14 Diffusion film 15 Black body layer 16 Reflection film 17 Light scattering material 18 Lamp reflector 21 Light quantity adjusting body 22 Light scattering reflector 23 Sub-scattering material 24 Light scattering pattern dot 25 Black body pattern dot DA Liquid crystal display effective area

Continuation of the front page (56) References JP-A-4-76593 (JP, A) JP-A-3-144690 (JP, A) JP-A-4-70629 (JP, U) JP-A-4-42688 (JP , U) Japanese Utility Model 62-154422 (JP, U) Japanese Utility Model Application Hei 3-86325 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G02F 1/1335 530

Claims (3)

(57) [Claims] 1. A liquid crystal display panel, a light guide plate disposed in parallel behind and illuminating the liquid crystal display plate, a light source disposed at an end of the light guide plate, and a rear portion in the light guide plate. A liquid crystal display device comprising: a reflection film for reflecting light toward the front, and a light scattering material in a dot pattern for scattering light toward the front in front of the reflection film; Is
The liquid crystal display effective area of the light guide plate is limited to a slightly larger area, and a sub-scattering material having a suppressed reflectance is formed around the light scattering material, and the sub-scattering material is made of the same material as the light scattering material. A liquid crystal display device comprising: light-scattering pattern dots and black-body pattern dots alternately arranged. 2. The liquid crystal display device according to claim 1, wherein
A lamp reflector disposed around the light source and reflecting light diverging outward from the light source toward the light guide plate, and a diffusion film for diffusing light emitted forward from the light guide plate toward the liquid crystal display plate are provided. The formation area size of the diffusion film is set to be slightly larger than the liquid crystal display effective area, the lamp reflector is directly adhered to the front end of the light guide plate, and is arranged away from the diffusion film, A liquid crystal display device, wherein a part of a front surface of the light guide plate is exposed at a portion between the lamp reflector and the diffusion film. 3. The liquid crystal display device according to claim 1, wherein
A lamp reflector disposed around the light source and reflecting light diverging outward from the light source toward the light guide plate, and a diffusion film for diffusing light emitted forward from the light guide plate toward the liquid crystal display plate are provided. The size of the diffusion film forming area is set to be slightly larger than the liquid crystal display effective area, the lamp reflector is directly adhered to the front end of the light guide plate, and is arranged away from the diffusion film, A liquid crystal display device, wherein a black black body layer is formed directly on the front surface of the light guide plate at a portion where the lamp reflector and the diffusion film are separated from each other.