WO2007043221A1

WO2007043221A1 - Display device and illumination device

Info

Publication number: WO2007043221A1
Application number: PCT/JP2006/313280
Authority: WO
Inventors: Daisuke Teragawa
Original assignee: Sharp Kabushiki Kaisha
Priority date: 2005-09-30
Filing date: 2006-07-04
Publication date: 2007-04-19
Also published as: WO2007043221A9

Abstract

A display device in which an occurrence of unevenness of brightness in a display region is suppressed by preventing occurrence of temperature distribution in a housing and suppressing variation in light emission characteristics of a light source. The display device (100) has a display panel and an illumination device (20) having light sources (24) arranged in a housing (40). The display device (100) further has an air discharge section (44) for discharging air in the housing (40) heated by the light sources (24) and heat sources of other electric circuits to the outside, and an air suction section (46) for sucking air outside the housing. The air discharge section (44) is placed below the air suction section (46), and air in the housing (40) is discharged after flowing downward from above so that temperature in the housing (40) becomes uniform.

Description

Specification

Display device and lighting device

Technical field

[0001] The present invention relates to a display device comprising a display panel and a lighting device inside a housing, and the lighting device, and more specifically, to a display device and a lighting device that have uniform temperatures and temperature distribution inside the housing of the display device and the lighting device. The present invention relates to a display device equipped with an exhaust structure that does not cause

Background technology

[0002] In recent years, flat panel displays have been widely used as display units for electrical products such as computers and televisions. As such a flat panel display, for example, a liquid crystal display device equipped with a liquid crystal display panel in which liquid crystal is sealed between a pair of transparent substrates is widely used.

[0003] In a liquid crystal display device including such a liquid crystal display panel, a lighting device is disposed on the back side of the liquid crystal display panel. This lighting device usually uses a discharge tube or a light emitting diode (hereinafter referred to as LED) as a light source. In a so-called direct type lighting device, a plurality of light sources such as the discharge tubes or LEDs are uniformly distributed over the entire display area of a liquid crystal display panel. The characteristics of the light emitted from this light source are adjusted using an optical sheet, etc., and then irradiated onto the back side of the night crystal panel. When this irradiated light passes through the liquid crystal display panel, an image is displayed on the front of the liquid crystal display panel.

[0004] Inside the casing of such a night crystal display device, the light source, its driving circuit, and other power circuits generate heat, and the air inside the casing is heated by the heat. Generally, this heated air rises inside the case and accumulates at the top, while relatively low-temperature air accumulates at the bottom. As a result, the temperature at the top of the housing is relatively high and the temperature at the bottom of the housing is relatively low, creating a temperature difference between the top and bottom of the housing.

[0005] In order to lower the temperature of the casing, a method is sometimes adopted in which heated air is exhausted and the heat inside the casing is radiated. In such cases, it is generally possible to efficiently increase the exhaust volume by exhausting the heated air in an upward flow. Therefore In addition, the intake port is placed below the casing, and the exhaust port is placed above the casing, so that the chimney effect causes the air to flow upwards and exhaust the air. In this way, the total amount of exhaust air from inside the casing can be increased, and therefore the average temperature inside the casing can be lowered.

[0006] Japanese Patent Application Laid-Open No. 2001-332074 relates to an exhaust structure for a DVD-type LCD TV in which a digital Versatile Disk (hereinafter referred to as DVD) and an LCD TV are arranged in one housing. It is. This DVD-type LCD TV has exhaust ports and intake ports at the top and bottom of its casing, allowing hot air to pass through with a chimney effect, with downward force directed upwards.

[0007] However, when the downward force is also upwardly directed and the air is exhausted, low temperature air flows into the lower part of the casing, causing the temperature to drop. This low-temperature air force flowing in from outside is heated inside the housing and rises, causing the temperature at the top of the housing to rise. For example, in large display devices, the air that flows into the intake locus has a long path to reach the exhaust port, and the temperature at the top of the case increases. Therefore, a very large temperature difference occurs between the upper and lower parts of the housing, resulting in a wide temperature distribution inside the housing.

[0008] When a large temperature distribution occurs inside the housing, variations occur in the light emission characteristics of the discharge tube that is the light source, and uniform light emission cannot be obtained within the display surface. As a result, uneven brightness occurs within the display surface, making it impossible to satisfy a predetermined display quality.

[0009] In particular, when a display device is used with discharge tubes arranged vertically, if a temperature difference occurs between the upper and lower portions of the housing, a temperature distribution will occur in the axial direction of the discharge tubes. Then, if the temperature inside the discharge tube is low and mercury condenses in the lower part, a problem arises. If mercury aggregates in a part of the discharge tube in this way, the life of the electrodes provided at both ends of the discharge tube will be shortened, and the discharge tube will no longer light up.

Disclosure of invention

Problems that the invention seeks to solve

[0010] Therefore, the problem to be solved by the present invention is that air heated by a heat source such as a light source of a lighting device provided inside a housing, a drive circuit thereof, a drive circuit of a display panel, or other electric circuits, etc. is exhausted while maintaining a uniform temperature inside the housing or lighting equipment. The purpose of this invention is to provide a display device.

Means to solve problems

[0011] In order to solve the above problems, a display device according to the present invention includes a display panel and a lighting device having a light source inside a housing, in which the light source and other electric lights inside the housing are provided. It has an exhaust section that exhausts air heated by the heat source of the circuit to the outside, and an intake section that takes in air from outside the casing, and the exhaust section is arranged below the intake section, and the casing The gist is that the air inside flows from the top to the bottom and is exhausted.

[0012] Further, the lighting device according to the present invention is a lighting device having a light source, and includes an exhaust section that exhausts air heated by the light source and other heat generating sources of the electric circuit inside the lighting device to the outside; The lighting device has an air intake section that takes in air from outside the lighting device, and the exhaust section is arranged below the intake section, and the air inside the lighting device flows downward under an upward force and is exhausted. It is something to do.

[0013] In this case, the exhaust section includes one or more openings provided in the lower part of the casing or the lower part of the lighting device, and the exhaust section connects the inside of the casing or the lighting device to the outside through the openings. It is preferable that the lighting device includes an exhaust fan that sends air to the lighting device, and the intake portion includes one or more openings provided at the top of the casing or the top of the lighting device.

[0014] Further, temperature detection means are provided at the lower and upper portions of the housing or the lighting device, an intake flow rate adjusting means for adjusting the flow rate of the air taken in from the intake section, and a temperature detection means for adjusting the flow rate of the air taken in from the intake section, and a temperature detection means for adjusting the flow rate of the air taken in from the intake section and the air discharged from the exhaust section. The exhaust flow rate and Z or the intake flow rate are adjusted by the intake flow rate adjustment means and Z or the exhaust flow rate adjustment means based on the difference between the detected temperature detected by the exhaust flow rate adjustment means that adjusts the flow rate of air and each temperature detection means. It is effective to include a feedback control section that adjusts the temperature distribution inside the housing or the lighting device to make it uniform.

[0015] Such a configuration can be suitably used in a display device equipped with an illumination device in which a plurality of discharge tubes are arranged in parallel as a light source. This is particularly effective in display devices in which these discharge tubes are arranged vertically. Effect of the invention

[0016] According to such a display device, since the exhaust section is disposed below the intake section, the air inside the casing can be exhausted by flowing from above to below. As a result, the relatively high-temperature air that tends to gather upwards inside the case mixes with the relatively low-temperature air that is taken in from the outside, effectively lowering the temperature at the top of the case. In this way, by creating a flow of air in the direction opposite to the upward airflow generated by the heating of the air inside the housing and exhausting it, the relatively warm temperature inside the housing is reduced compared to the relatively cold air! By mixing the air, heat can be radiated while maintaining a uniform temperature inside the housing. Thereby, variations in the light emission characteristics of the light sources can be suppressed, and the occurrence of brightness unevenness within the display area can be suppressed.

[0017] If the exhaust section provided at the bottom of the casing is equipped with an exhaust fan, the air inside the casing will be forced out of the casing against the flow of the heated air inside the casing that tends to rise. It can be forced to exhaust to the outside. This promotes intake of air into the upper part of the case, and allows the heat inside the case to be dissipated while keeping the temperature difference between the upper and lower parts of the case small.

[0018] Furthermore, if the temperature of the upper part of the casing and the lower part of the casing is detected and the exhaust flow rate and Z or intake flow rate are feedback-controlled based on the temperature difference, the temperature difference between the upper part of the casing and the lower part of the casing can be The exhaust flow rate and intake flow rate can be automatically adjusted according to the following conditions. Therefore, it is possible to automatically respond to the effects of the lighting status of lighting equipment, the amount of heat generated by the electric circuit, the temperature of the outside air sucked into the housing, and more reliably and stably. temperature difference can be kept small.

[0019] According to the display device that is adjusted so that the air inside the casing flows from the top to the bottom and is exhausted so that the temperature inside the casing becomes uniform, the display device is equipped with the lighting device. Even if the light source is a plurality of discharge tubes arranged in parallel, there will be no variation in the light emission characteristics of the discharge tubes. Therefore, uniform light emission can be obtained within the display surface, and unevenness in brightness does not occur.

[0020]Furthermore, even when the display device is used with the discharge tube arranged vertically, there is no temperature distribution within the discharge tube, and mercury does not aggregate at the bottom of the discharge tube. Therefore, the discharge tube can be lit stably. [0021] Furthermore, if the lighting device has the exhaust section and the intake section, and the exhaust section is arranged below the intake section, air flows from above to below inside the lighting device. It is possible to generate a flow of This can prevent the higher temperature air inside the lighting device from being concentrated in the upper part of the lighting device. In addition, since air from outside the lighting device is sucked in from the intake section, the heated air inside the lighting device is mixed with relatively low-temperature air taken in from outside the lighting device in the upper part of the lighting device. . Therefore, the temperature in the upper part of the lighting device can be effectively lowered. As a result, the temperature inside the lighting device can be kept uniform, and the air can be exhausted from the exhaust section to dissipate the heat inside the lighting device.

[0022] According to the lighting device 20, it is possible to generate an airflow flowing from the top to the bottom inside the lighting device, and the temperature inside the lighting device can be directly uniformized, so that it is possible to directly equalize the temperature inside the lighting device. more effective.

Brief description of the drawing

[0023] [FIG. 1] A diagram schematically showing the back side of a liquid crystal display device according to a first embodiment of the present invention.

[FIG. 2] A cross-sectional view of the liquid crystal display device shown in FIG. 1.

[FIG. 3] A diagram schematically showing the back side of a liquid crystal display device according to a second embodiment of the present invention.

[FIG. 4] A cross-sectional view of the liquid crystal display device shown in FIG. 3.

[Figure 5] A block diagram schematically showing feedback control for uniformizing the temperature inside the casing of the liquid crystal display device shown in Figure 4.

FIG. 6 is a diagram schematically showing a cross section of a lighting device according to a third embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0024] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5.

[0025] FIGS. 1 and 2 are diagrams schematically showing a liquid crystal display device according to a first embodiment of the present invention, with FIG. 1 being a perspective view from the back and FIG. 2 being a cross-sectional view. .

[0026] The liquid crystal display device 100 shown in FIGS. 1 and 2 includes a liquid crystal module 30 consisting of a display panel 10 and a lighting device 20 within a housing 40. Display panel 10 consists of two glass substrates. 12, 12 are bonded together and a liquid crystal 14 is sealed between them. A display panel drive circuit (not shown) is connected to the display panel 10 to control the display state.

[0027] The lighting device 20 is composed of optical sheets 22, a plurality of discharge tubes 24, an inverter circuit board (not shown) for driving these discharge tubes, a reflection plate 26, and the like. The optical sheets 22 are for adjusting the characteristics of the light incident on the display panel 10 from the discharge tube 24, and are composed of, for example, a diffusion sheet, a lens sheet, a polarized light reflection sheet, a diffusion plate, etc. Each discharge tube 24 is arranged vertically and connected to an inverter circuit. These discharge tubes 24 are arranged in parallel in the lateral direction.

[0028] In FIGS. 1 and 2, a lighting device 20 including a plurality of discharge tubes 24 is illustrated, but a lighting device using other light sources may be used. For example, a lighting device in which a plurality of light emitting diodes or the like are arranged may be used. In short, any lighting device may be used as long as it has a light source with temperature-dependent light emission characteristics.

[0029] The back of the casing 40 is provided with openings 44m and 46m!/,ru. Filter members 44f and 46f are provided in these openings 44m and 46m to prevent dust from entering the housing. Furthermore, an exhaust fan 42 is provided at the bottom of the casing 40 so as to exhaust the air inside the casing 40 through an opening 44 m. The exhaust part 44 is constituted by the opening 44m having the filter member 44f and the exhaust fan 42, and the intake part 46 is also constituted by the opening 46f having the filter member 46f.

[0030] When the exhaust fan 42 is turned on, the air inside the casing 40 is exhausted from the exhaust section 44, and along with this, the air outside the casing 40 is taken in from the intake section 46. Thereby, an air flow as shown by arrow 50 can be generated inside the casing 40.

[0031] When the liquid crystal display device 100 is turned on, the illumination device 20 is driven via the inverter circuit, and the light emitted from the discharge tube 24 is transmitted to the display panel via the reflector 26 and the optical sheets 22. 10 irradiated. Then, the display panel drive circuit controls the transmittance of the display panel 10. When the discharge tube 24 is lit in this manner and the electric circuits such as the drive circuit and the inverter circuit are operated, the discharge tube 24 and various electric circuits generate heat, and the air inside the casing 40 is heated. In this way, when air is heated in a closed space, the hotter air rises. relatively low temperature air tends to be biased downward.

[0032] However, here, air is flowed upwardly and downwardly from the intake section 46 provided at the top of the housing 40 toward the exhaust section 44. This can prevent the higher temperature air inside the casing 40 from being biased towards the upper part of the casing 40. In addition, since the air outside the casing 40 is taken in from the intake part 46, in the upper part of the inside of the casing 40, the heated air inside the casing 40 and the relatively low temperature air taken in from outside the casing are mixed. are mixed. Therefore, the temperature in the upper part of the housing 40 can be effectively lowered. Thereby, the temperature inside the casing 40 can be kept uniform, and the air can be exhausted from the exhaust section 44 to radiate the heat inside the casing 40.

[0033] In this way, since the temperature inside the casing 40 is made uniform, temperature distribution is unlikely to occur in the axial direction of the discharge tube 24. Therefore, there is no risk of mercury condensing within the discharge tube 24, and the problem of the discharge tube 24 not lighting up is less likely to occur.

[0034] FIGS. 3 and 4 are diagrams schematically showing a liquid crystal display device according to a second embodiment of the present invention, with FIG. 3 being a perspective view from the back and FIG. 4 being a cross-sectional view. .

[0035] The liquid crystal display device 200 shown in FIGS. 3 and 4 is the same as the liquid crystal display device 100 according to the first embodiment of the present invention. Prepared within 40.

[0036] The lighting device 20 is composed of optical sheets 22, a plurality of discharge tubes 24, an inverter circuit board (not shown) for driving these discharge tubes, a reflection plate 26, and the like. Each discharge tube 24 is arranged horizontally and connected to an inverter circuit. These discharge tubes 24 are arranged in parallel in the vertical direction.

[0037] Openings 44m and 46m are provided on the back of the casing 40!/,ru. Filter members 44f and 46f are attached to these openings 44m and 46m. An intake fan 48 is installed at the top of the casing 40 so as to draw air into the casing 40 through an opening 46 m. Furthermore, an exhaust fan 42 is provided at the bottom of the casing 40 so as to exhaust the air inside the casing 40 through an opening 44 m.

[0038] The exhaust section 44 is composed of the opening 44 having the filter member 44f and the exhaust fan 42, and the intake section 46 is composed of the opening 46m having the filter member 46f and the intake fan 48. There is. [0039] When the exhaust fan 42 and the intake fan 48 are turned on, outside air is taken into the casing 40 from the intake section 46, and air inside the casing 40 is exhausted from the exhaust section 44. Thereby, an air flow as shown by arrow 50 can be generated inside the casing 40.

[0040] When the liquid crystal display device 200 is turned on, the discharge tubes 24 are turned on, and electric circuits such as the drive circuit and the inverter circuit of the display panel 10 are activated. Along with this, the discharge tube 24 and various electric circuits generate heat, and the air inside the casing 40 is heated. In this way, when air is heated in a closed space, the hotter air tends to be biased upwards, and the relatively cooler air tends to be biased downwards.

[0041] However, here, outside air is taken in from an intake part 46 provided at the top of the casing 40 via an intake fan 48, and air inside the casing 40 is exhausted via an exhaust fan 42. Air is flowing from top to bottom toward the exhaust section 44. This can prevent the higher temperature air inside the casing 40 from being biased towards the upper part of the casing 40.

[0042] Furthermore, air outside the casing 40 is forcibly taken in from the intake section 46 via the intake fan 48. Therefore, in the upper part of the casing 40, the heated air inside the casing 40 and a large amount of relatively low-temperature air that is forcibly taken in from outside the casing 40 are mixed. Thereby, the temperature in the upper part of the housing 40 can be effectively lowered. The heat inside the housing 40 can be radiated by exhausting air from the exhaust section 44 while keeping the temperature inside the housing 40 uniform.

[0043] In this way, since the temperature inside the casing 40 is made uniform, the temperature becomes uniform among the plurality of discharge tubes 24 arranged vertically. This eliminates temperature differences between the plurality of discharge tubes 24, and there is no variation in light emission characteristics. Therefore, it is possible to obtain light with uniform brightness over the entire display area.

[0044] Here, the intake flow rate FL from the intake section 46 and the exhaust flow rate FL from the exhaust section 42 are

1 2

The exhaust fan 42 and Z or the intake fan 48 are turned on and off based on the on and off status of the liquid crystal display device 100 and 200, regardless of the temperature distribution inside the housing 40 or the temperature of the outside air taken into the housing 40. However, it is also possible to adjust the intake flow rate FL and the exhaust flow rate FL depending on the temperature difference between the upper and lower parts of the housing 40.

1 2

[0045] As shown in FIG. 4, upper temperature detection means 52T for detecting the temperature T at the upper part inside the casing 40 and lower temperature detection means 52T for detecting the temperature T at the lower part inside the casing 40 are arranged. above this Lower temperature detection means 52T, 52T is not particularly limited, and may be a thermocouple, thermistor, etc.

1 2 If it is a commonly used temperature sensor.

[0046] Furthermore, examples of the intake flow rate adjustment means and exhaust flow rate adjustment means include the following. For example, the openings 44m and 46m can be opened and closed freely, and when reducing the flow rate, the openings 44m and 46m are partially or completely closed to narrow the area. Further, the exhaust fan 42 and the intake fan 48 are blower fans whose air volume can be adjusted. By appropriately combining such configurations, the intake flow rate FL and the exhaust flow rate FL can be adjusted.

1 2

[0047] Figure 5 shows the intake air flow rate FL and

1 2 1 Overview of feedback control to equalize the temperature inside the casing 40 by adjusting the flow rate and exhaust flow rate FL.

2

FIG.

[0048] First, a target value T T of the temperature difference between the upper and lower parts of the casing 40 is given, and the upper temperature

SI S2

Case 40 determined from the detection results of detection means 52T and lower temperature detection means 52T

1 2

The result of comparing the actual internal temperature difference T — T with the target value T — T is the force feedback.

1 2 SI S2

input to the lock control section. Based on the results of this comparison, the feedback control section adjusts the intake flow rate FL

1 and exhaust flow rate FL

2 and input it to the intake flow rate adjustment means and exhaust flow rate adjustment means. In this way, the actual temperature difference T — T inside the housing 40 is changed to the target value T — T

1 2 Feedback control is applied to bring it closer to SI S2.

[0049] As a result, the actual temperature difference T T inside the housing 40 approaches the predetermined target value T T .

1 2 SI S2 The intake flow rate FL and exhaust flow rate FL are automatically adjusted. Therefore, inside the casing

1 2

The temperature is automatically maintained at a more ideal state. For example, when the outside air of the casing 40 is extremely cold, there is no possibility that too much outside air will be taken in from the intake section 46 and the temperature at the top of the casing 40 will drop too much.

[0050] Next, a third embodiment of the present invention will be described based on FIG. 6. FIG. 6 is a cross-sectional view schematically showing a lighting device according to a third embodiment of the present invention.

[0051] The lighting device 20 shown in FIG. 6 is placed on the back side of the display panel 10. A liquid crystal module 30 is composed of the display panel 10 and the lighting device 20. The display panel 10 is composed of two glass substrates 12, 12 bonded together and a liquid crystal 14 sealed between them. This display panel 10 includes a display panel drive circuit (not shown) for controlling the display state. roads are connected.

[0052] The lighting device 20 includes optical sheets 22, a plurality of discharge tubes 24, an inverter circuit board (not shown) for driving these discharge tubes, and a reflection plate 26. The optical sheets 22 are used to adjust the characteristics of the light that enters the display panel 10 from the discharge tube 24, and are composed of, for example, a diffusion sheet, a lens sheet, a polarized light reflection sheet, a diffusion plate, and the like. Each discharge tube 24 is arranged vertically and connected to an inverter circuit. These discharge tubes 24 are arranged in parallel in the lateral direction.

[0053] The reflecting plate 24 is provided with openings of 44 m and 46 m. Filter members 44f and 46f are provided in these openings 44m and 46m to prevent dust and the like from entering from outside the lighting device 20. Furthermore, an exhaust fan 42 is provided at the bottom of the reflector 24 so as to exhaust the air inside the liquid crystal module 30 through an opening of 44 m. An exhaust section 44 is constituted by the opening 44m having the filter member 44f and the exhaust fan 42, and an intake section 46 is constituted by the opening 46f having the filter member 46f.

[0054] Here, the reflection plate 26 reflects the light emitted from the discharge tube 24 toward the display panel 10 side. Therefore, it is desirable that the openings 44m and 46m provided in these openings be provided so as not to impede the reflection of light onto the display panel 10.

[0055] When the exhaust fan 42 is turned on, the inside of the lighting device 20 is aerodynamically exhausted from the exhaust section 44, and the air outside the liquid crystal module 30 is sucked in from the intake section 46. This makes it possible to generate a flow of air inside the lighting device 20 from above to below.

[0056] This can prevent the higher temperature air inside the lighting device 20 from being biased towards the upper part of the lighting device 20. In addition, since the air outside the lighting device 20 is taken in from the air intake part 46, the heated air inside the lighting device 20 and the relatively low temperature air taken in from outside the lighting device 20 are mixed in the upper part of the lighting device 20. are mixed. Therefore, the temperature in the upper part of the lighting device 20 can be effectively lowered. Thereby, the temperature inside the lighting device 20 can be kept uniform while the air can be exhausted from the exhaust section 44 to radiate the heat inside the lighting device 20.

[0057] According to such a lighting device 20, the temperature inside the lighting device 20 is made uniform. , temperature distribution is unlikely to occur in the axial direction of the discharge tube 24. Therefore, there is no risk of mercury condensing within the discharge tube 24, and the problem of the discharge tube 24 not lighting up is less likely to occur. Furthermore, according to such a lighting device 20, it is possible to generate an airflow flowing from the top to the bottom inside the lighting device, and the temperature inside the lighting device can be directly equalized, which makes it more effective. It's relevant.

[0058] Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments in any way, and it goes without saying that the present invention can be implemented in various forms without departing from the gist of the present invention. For example, it is possible to combine these embodiments as appropriate, and it goes without saying that the structure of the exhaust section and intake section and the configuration of feedback control shown as an example of the display device can be applied to the lighting device. Furthermore, an LED may be used as the light source.The position of the exhaust section or the intake section and its shape are not limited to those of the above embodiments, but the point is that the air is forced upwardly and downwardly within the casing. , the exhaust section may be provided below the intake section.

Industrial applicability

[0059] According to the display device according to the present invention, heated air can be exhausted while keeping the temperature inside the casing uniform, and the light emitting characteristics of the plurality of light sources provided in the lighting device can vary. Since this does not occur, it is suitable for liquid crystal display devices and the like that require uniform light emission within the display surface.

Claims

The scope of the claims

[1] In a display device comprising a display panel and a lighting device having a light source inside a housing.

, an exhaust section that exhausts air heated by the light source and other heat generating sources of the electric circuit inside the casing to the outside, and an intake section that takes in air from outside the casing, and the exhaust section has the 1. A display device disposed below an air intake section, the air inside the casing flowing from the top to the bottom and being exhausted.

[2] The exhaust section includes one or more openings and an exhaust fan that sends air from the inside of the casing to the outside through the openings, and the intake section includes one or more openings. 2. The display device according to claim 1, further comprising:

[3] Temperature detection means are provided at least at the lower and upper portions of the casing, and an intake flow rate adjusting means for adjusting the flow rate of the air taken in and the flow rate of the air discharged from the air intake section or the exhaust section; The temperature distribution inside the housing is made uniform through the intake flow rate adjustment means and the Z or exhaust flow rate adjustment means based on the difference in temperature detected by each temperature detection means. 3. The display device according to claim 1, further comprising a feedback control unit that adjusts the exhaust flow rate and Z or the intake flow rate so as to

[4] The table according to claims 1 to 3, wherein the lighting device includes a plurality of discharge tubes as a light source, and the plurality of discharge tubes are arranged in parallel. display device.

5. The display device according to claim 4, wherein the plurality of discharge tubes are installed vertically.

[6] In a lighting device that has a light source, an exhaust section that exhausts air heated by the light source and other electric circuit heat sources inside the lighting device to the outside, and an intake section that takes in air from outside the lighting device. A lighting device, characterized in that the exhaust section is disposed below the intake section, and the air inside the lighting device flows downward and is exhausted by an upward force.

[7] The exhaust section includes one or more openings and an exhaust fan that sends air out of the lighting device through the openings, and the intake section includes one or more openings. 7. The lighting device according to claim 6, comprising:

[8] Temperature detection means are provided at least at the lower and upper portions of the illumination device, and the intake flow rate adjusting means adjusts the flow rate of the air taken in, and the flow rate of the air discharged from Z or the exhaust portion. temperature distribution inside the lighting device via the intake flow rate adjustment means and the Z or exhaust flow rate adjustment means based on the difference between the detected temperatures detected by each temperature detection means. 8. The lighting device according to claim 6 or 7, further comprising a feedback control unit that adjusts the exhaust flow rate and Z or the intake flow rate so as to make them uniform.

[9] The lighting device according to claim 6, wherein the lighting device includes a plurality of discharge tubes as a light source, and the plurality of discharge tubes are arranged in parallel. Light device.

[10] The lighting device according to claim 9, wherein the plurality of discharge tubes are installed vertically.