JP2002189207A - Liquid crystal unit and liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool the inside of a liquid crystal unit including a backlight or the like by using natural convection. SOLUTION: An evacuation opening part 7a is formed on the upper part of a case 7 of a vertical type liquid crystal unit 1 and an intake opening part 7b is formed on the lower part of the case 7. Consequently, when the air inside the liquid crystal unit 1 is heated with the backlight 2 or the like, the heated air rises and discharged from the evacuation opening part 7a while the air outside the liquid crystal unit 1 flows in from the intake opening part 7b, thereby result cools the backlight 2 or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic apparatus having a liquid crystal display unit, for example, a liquid crystal unit or a liquid crystal display device of a notebook computer or a liquid crystal television.

[0002]

2. Description of the Related Art Generally, a liquid crystal unit 1 mounted on an electronic device such as a notebook personal computer or a liquid crystal television has one or two backlights 2 as shown in FIG. Is reflected and diffused by the diffusion plate 5 via the light guide plate 3 and the reflection sheet 4, and the liquid crystal panel 6
An edge type liquid crystal unit that displays information on a liquid crystal panel 6 by transmitting light through the liquid crystal panel 6 is known.

On the other hand, in recent years, with the demand for a larger screen and higher brightness of a liquid crystal display section of an electronic device, two or more backlights 2 are evenly arranged in a unit 1 as shown in FIG. The light from the backlight 2 is reflected and diffused by the diffusion plate 5 via the reflection sheet 4, and the light is transmitted by the liquid crystal panel 6, so that sufficient luminance can be ensured even when the liquid crystal panel 6 has a large screen. A direct-type liquid crystal unit that can be used is provided.

As described above, the amount of heat generated from the backlight 2 and the substrate tends to increase as the screen size and the brightness of the liquid crystal panel 6 increase, and as a result, the liquid crystal unit 1 is heated to a high temperature. There has been a problem in that the liquid crystal may malfunction or the temperature of the liquid crystal panel 6 may be uneven to lower the display quality of the liquid crystal.

In response to such a problem, Japanese Patent Laid-Open No.
As described in JP-A No. 01458, an exhaust fan is arranged inside the apparatus, and by driving the exhaust fan, heated air inside the apparatus is forcibly exhausted from an exhaust port to cool the inside of the apparatus. ing.

[0006]

However, in the above-described cooling device for a liquid crystal display device, an exhaust fan is required, and noise generation and increase in power consumption cannot be avoided. Further, the liquid crystal unit needs to reflect light from the backlight in the unit and efficiently direct the reflected light toward the liquid crystal panel. However, it is necessary to prevent foreign matter such as dust from entering the liquid crystal unit. The louver is located immediately below the lamp house, so that light from the lamp to the liquid crystal panel is obstructed by the louver, and a predetermined luminance may not be secured.

The present invention has been made in view of such problems, and provides a liquid crystal unit and a liquid crystal display device capable of effectively cooling a backlight or the like by utilizing natural convection. .

[0008]

According to the present invention, there is provided a direct-type liquid crystal unit having at least a liquid crystal panel, a case for supporting the liquid crystal panel, and a plurality of backlights arranged behind the liquid crystal panel. One or more exhaust openings are formed in the upper part of the case, and one or more intake openings are formed in the lower part of the case.

According to the present invention, the air inside the liquid crystal unit is heated by the backlight or the like, rises, and is discharged to the outside of the liquid crystal unit from the exhaust opening. On the other hand, as the air inside the liquid crystal unit is discharged, air outside the liquid crystal unit flows into the liquid crystal unit from the intake opening. Therefore, natural convection of air flowing from the intake opening to the exhaust opening through the inside of the liquid crystal unit is generated.

As a result, the inside of the liquid crystal unit including the backlight and the like can be cooled, and the temperature difference between the upper and lower parts inside the liquid crystal unit can be eliminated.

In the present invention, if a ventilation cover is provided outside the exhaust opening to shield the opening, the light from the backlight can be prevented without obstructing the discharge and inflow of air. Can be prevented from leaking out of the liquid crystal unit, and foreign substances such as water droplets and dust can be prevented from entering the inside of the liquid crystal unit.

In the present invention, when the peripheral edge of the exhaust opening is bent outward, foreign matters such as water droplets and dust enter the liquid crystal unit through the exhaust opening more reliably. can do.

In the present invention, when the ventilation cover has a bent portion for shielding the upper opening of the ventilation cover, foreign matters such as water droplets and dust are prevented from entering the liquid crystal unit through the upper opening of the ventilation cover. can do.

Further, according to the present invention, the liquid crystal unit according to the first aspect is housed in a housing having an exhaust opening and an intake opening formed in an upper portion and a lower portion, respectively. A shielding member for shielding the openings is provided outside the exhaust opening and the intake opening of the unit.

According to the present invention, the air inside the liquid crystal unit rises by being heated by the backlight or the like, and is discharged from the exhaust opening of the liquid crystal unit to the outside of the liquid crystal display device through the exhaust opening of the housing. You. On the other hand, as the air inside the liquid crystal unit is discharged, air outside the liquid crystal display device flows into the liquid crystal unit through the intake opening of the housing and the intake opening of the liquid crystal unit. Therefore, natural convection of air flowing from the intake opening of the housing and the intake opening of the liquid crystal unit to the exhaust opening of the liquid crystal unit and the exhaust opening of the housing via the inside of the liquid crystal unit is generated.

As a result, even when the ventilation cover cannot be directly provided on the liquid crystal unit, the inside of the liquid crystal unit including the backlight can be cooled and the temperature difference between the upper and lower parts inside the liquid crystal unit can be eliminated. be able to. In addition, it is possible to prevent the light from the backlight from leaking out of the liquid crystal unit without obstructing the discharge and inflow of air through the shielding member, and to prevent foreign matters such as water droplets and dust from entering the liquid crystal unit. Can be prevented.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show one embodiment of the liquid crystal unit 1 of the present invention, that is, a direct type liquid crystal unit.

The liquid crystal unit 1 includes a liquid crystal panel 6 and
And a case 7 for holding the liquid crystal panel 6. In the case 7, a plurality of backlights 2 are arranged in parallel behind the liquid crystal panel 6 to irradiate the liquid crystal panel 6. ing. A plurality of exhaust openings 7a are formed on the upper surface of the case 7 at predetermined intervals, and are located outside the openings 7a so as to shield each exhaust opening 7a. A ventilation cover 8A is provided (see FIG. 3A). Similarly, a plurality of intake openings 7b are formed on the lower surface of the case 7 at predetermined intervals, and are positioned outside the openings 7b so as to shield each intake opening 7b. Cover 8A
Is provided (see FIG. 3B).

Therefore, the air inside the liquid crystal unit 1 is heated by the backlight 2 or the like and rises, and is discharged from the exhaust opening 7a. On the other hand, when the air inside the liquid crystal unit 1 is discharged, the air inside the liquid crystal unit 1 is discharged. External air flows into the liquid crystal unit 1 from the intake opening 7b.

As a result, natural convection of the air flowing from the intake opening 7b of the liquid crystal unit 1 to the exhaust opening 7a is generated, and the inside of the liquid crystal unit 1 including the backlight 2 and the like can be cooled. The upper and lower temperature differences inside the liquid crystal unit 1 can be eliminated. In addition, it is possible to prevent the light from the backlight 2 from leaking outside through the ventilation cover 8A, and to prevent foreign matters such as water droplets and dust from entering the liquid crystal unit 1 from the exhaust opening 7a. Can be prevented.

In the above-described embodiment, as shown in FIGS. 4 and 5, the peripheral edge of the exhaust opening 7a may be bent outward. It may be bent outward or inward. As described above, by bending the peripheral edge of the exhaust opening 7a, or by bending the side edge of the ventilation cover 8A together with the peripheral edge of the exhaust opening 7a or independently, foreign matter such as water droplets can be further reduced. Intrusion can be prevented.

FIGS. 6 and 7 show another embodiment of the liquid crystal unit 1 of the present invention.

In the liquid crystal unit 1, the case 7
A plurality of exhaust openings 7a are formed in parallel on the upper rear surface of the device, and a plurality of intake openings 7b are formed in parallel on the lower rear surface of the device. A ventilation cover 8B is provided on the rear surface of the case 7 so as to extend upward so as to cover each exhaust opening 7a and to have a bent portion 81 bent laterally so as to cover the upper end opening. Have been. A hood-shaped ventilation cover 8C is provided on the back surface of the case 7 so as to extend downward so as to cover the intake opening 7b and to open a lower end.

Therefore, also in this embodiment, when the air inside the liquid crystal unit 1 is heated by the backlight 2 or the like, it rises in the ventilation cover 8B through the exhaust opening 7a, and from the upper end side to the outside. Is discharged. On the other hand, when the air inside the liquid crystal unit 1 is exhausted,
Air outside the liquid crystal unit 1 flows into the liquid crystal unit 1 through the lower end portion of the ventilation cover 8C and the intake opening 7b.

As a result, natural convection of the air flowing from the intake opening 7b of the liquid crystal unit 1 to the exhaust opening 7a is generated, so that the inside of the liquid crystal unit 1 including the backlight 2 can be cooled and the liquid crystal can be cooled. The upper and lower temperature difference inside the unit 1 can be eliminated. In addition, the bending portion 8
The light from the backlight 2 can be prevented from leaking to the outside via the ventilation cover 8B having the air outlet 1 and foreign matters such as water droplets and dust enter the liquid crystal unit 1 from the exhaust opening 7a. Can be prevented.

In the embodiment described above, the case 7 has a plurality of exhaust openings 7a and intake openings 7a.
Although the case where b is formed is illustrated, one opening 7a, 7b may be used since an opening area set in consideration of the amount of heat generated inside the liquid crystal unit 1 may be ensured.

If the ventilation covers 8A, 8B and 8C cannot be provided due to the structure and cost of the liquid crystal unit 1, as shown in FIGS. The liquid crystal display device 10 may be housed in the liquid crystal display device 10, and a shielding member 11 may be provided in the housing 9 to cool the inside of the liquid crystal unit 1 and prevent foreign substances from entering.

More specifically, the liquid crystal display device 10 comprises a liquid crystal unit 1 and a housing 9 for accommodating the liquid crystal unit 1. Then, the case 7 of the liquid crystal unit 1
Openings 7 respectively formed on the upper and lower surfaces of the
The housing 9 has an exhaust opening 9a and an intake opening 9b formed on the upper and lower surfaces of the housing 9 so as to face the intake opening 7a and the intake opening 7b, respectively. In addition, between the exhaust opening 7a of the case 7 and the exhaust opening 9a of the housing 9, and between the intake opening 7b of the case 7 and the intake opening 9b of the housing 9, the intake air of the case 7 is provided. A shielding member 11 for shielding the opening 7a for intake and the opening 7b for intake is arranged.

Here, ventilation holes 11a are formed in the shielding member 11 except for a position facing the exhaust opening 7a and the intake opening 7b of the case 7. That is, the shielding member 11 shields the position of the case 7 that faces the exhaust opening 7a and the intake opening 7b.

Therefore, the air inside the liquid crystal unit 1 is heated by the backlight 2 or the like, rises and is exhausted from the exhaust opening 7a, and then vents 11a of the shielding member 11 and the exhaust opening of the housing 9. It is discharged to the outside of the liquid crystal display device 10 through the section 9a. When the air inside the liquid crystal unit 1 is exhausted to the outside of the liquid crystal display device 10, the air outside the liquid crystal display device 10 is used for the air intake opening 9 b of the housing 9, the ventilation port 11 a of the shielding member 11 and the air intake of the liquid crystal unit 1. The liquid flows into the liquid crystal unit 1 through the opening 7b.

As a result, after flowing into the inside of the liquid crystal unit 1 through the intake opening 9b of the housing 9, the ventilation opening 11a of the shielding member 11, and the intake opening 7b of the liquid crystal unit 1,
Natural convection of the air flowing to the exhaust opening 7 a of the liquid crystal unit 1, the ventilation opening 11 a of the shielding member 11, and the exhaust opening 9 a of the housing 9 is generated, thereby cooling the inside of the liquid crystal unit 1 including the backlight 2. In addition to this, it is possible to eliminate a temperature difference between the upper and lower portions inside the liquid crystal unit 1. In addition, it is possible to prevent the light from the backlight 2 from leaking to the outside via the shielding member 11, and to form water droplets from the exhaust opening 9 a of the housing 9 through the exhaust opening 7 a of the liquid crystal unit 1. It is possible to prevent foreign matter such as dust and dust from entering the inside of the liquid crystal unit 1.

In this embodiment, the shielding member 11 having the ventilation port 11a is exemplified. However, a plurality of shielding members 11 are opposed to the exhaust opening 7a and the intake opening 7b of the liquid crystal unit 1. Each may be arranged at an outer position.

When the exhaust opening 7a and the intake opening 7b are formed in the upper and lower rear surfaces of the case 7 of the liquid crystal unit 1, respectively, as shown in FIG. What is necessary is just to arrange | position at the external position which opposes the opening 7a and the opening 7b for intake. As shown in FIG. 11, instead of the ventilation cover 8B of the embodiment shown in FIGS. 6 and 7, a ventilation cover 8D having no bent portion 81 is provided so as to shield the upper opening of the ventilation cover 8D. The shielding member 11 may be provided.

[0035]

As described above, according to the present invention, the air inside the liquid crystal unit is heated by the backlight or the like, rises, and is discharged outside the liquid crystal unit from the exhaust opening. On the other hand, as the air inside the liquid crystal unit is discharged, air outside the liquid crystal unit flows into the liquid crystal unit from the intake opening. Therefore, natural convection of air flowing from the intake opening to the exhaust opening through the inside of the liquid crystal unit is generated. As a result, the inside of the liquid crystal unit including the backlight and the like can be cooled, and the upper and lower temperature difference inside the liquid crystal unit can be eliminated.

Further, according to the present invention, the air inside the liquid crystal unit rises by being heated by the backlight or the like, and goes from the exhaust opening of the liquid crystal unit to the outside of the liquid crystal display device through the exhaust opening of the housing. Is discharged. On the other hand, as the air inside the liquid crystal unit is discharged, air outside the liquid crystal display device flows into the liquid crystal unit through the intake opening of the housing and the intake opening of the liquid crystal unit. Therefore, natural convection of air flowing from the intake opening of the housing and the intake opening of the liquid crystal unit to the exhaust opening of the liquid crystal unit and the exhaust opening of the housing via the inside of the liquid crystal unit is generated. As a result, even if it is not possible to directly provide a ventilation cover on the liquid crystal unit,
The inside of the liquid crystal unit including the backlight and the like can be cooled, and the temperature difference between the inside and the outside of the liquid crystal unit can be eliminated. In addition, it is possible to prevent the light from the backlight from leaking out of the liquid crystal unit without obstructing the discharge and inflow of air through the shielding member, and to prevent foreign matters such as water droplets and dust from entering the liquid crystal unit. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a liquid crystal unit of the present invention.

FIG. 2 is a cross-sectional view showing a part of the liquid crystal unit shown in FIG.

FIG. 3 is a cross-sectional view showing the liquid crystal unit of FIG. 1 with a part thereof omitted;

FIG. 4 is a cross-sectional view partially showing another embodiment of an exhaust opening of a liquid crystal unit.

FIG. 5 is a cross-sectional view illustrating another embodiment of the exhaust opening of the liquid crystal unit, with a part thereof being omitted;

FIG. 6 is a rear perspective view showing another embodiment of the liquid crystal unit of the present invention.

FIG. 7 is a cross-sectional view illustrating the liquid crystal unit of FIG. 6 with a part thereof omitted;

FIG. 8 is a rear perspective view showing the liquid crystal display device of the present invention.

FIG. 9 is a cross-sectional view showing a part of the liquid crystal display device shown in FIG. 8;

FIG. 10 is a cross-sectional view showing a liquid crystal display device according to another embodiment of the present invention with a part thereof being omitted;

FIG. 11 is a cross-sectional view showing a liquid crystal display device according to another embodiment of the present invention, with a part thereof being omitted;

FIG. 12 is a cross-sectional view showing a part of a conventional edge-type liquid crystal unit, which is omitted.

FIG. 13 is a cross-sectional view showing a part of a conventional direct-type liquid crystal unit, which is partially omitted.

[Explanation of symbols]

 Reference Signs List 1 liquid crystal unit 2 backlight 6 liquid crystal panel 7 case 7a exhaust opening 7b intake opening 8A, 8B, 8C, 8D ventilation cover 9 housing 9a exhaust opening 9b intake opening 10 liquid crystal display device 11 shielding member 11a Vent

Claims (5)

[Claims] 1. A direct type liquid crystal unit including at least a liquid crystal panel, a case supporting the liquid crystal panel, and a plurality of backlights arranged behind the liquid crystal panel, wherein one or more light sources are provided on an upper part of the case. A liquid crystal unit comprising: a plurality of exhaust openings; and one or more intake openings formed in a lower portion of the case. 2. The liquid crystal unit according to claim 1, further comprising a ventilation cover located outside the exhaust opening and blocking the opening. 3. The liquid crystal unit according to claim 1, wherein a peripheral edge of the exhaust opening is bent outward. 4. The ventilation cover according to claim 2, wherein the ventilation cover has a bent portion for blocking an upper end opening of the ventilation cover.
Or the liquid crystal display device according to 3. 5. The liquid crystal unit according to claim 1, which is housed in a housing having an exhaust opening and an intake opening formed in an upper part and a lower part, respectively. A liquid crystal display device, comprising: a shielding member that is located outside the opening and the intake opening and that shields the opening.