JP3583062B2 - Display element and projection type liquid crystal display device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image display element suitable for use in a projection type image display device, and more specifically, to a display element capable of improving the cooling efficiency of a display panel.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a projection type image display device (liquid crystal projector) configured using a transmission type liquid crystal panel has been known. The liquid crystal projector has excellent features such as a wide color reproduction range, small size, weighing, and no need for convergence adjustment, as compared with a projection type image display device using a CRT.
[0003]
In a liquid crystal projector, light from a light source is effectively applied to a liquid crystal panel using an optical system such as a reflecting mirror. For the light source, a high-output light source such as a xenon lamp or a metal halide lamp is used, and by using such a light source that emits strong light, the brightness of an image projected on a screen is improved. .
[0004]
The light from the light source is usually passed through a filter that cuts off heat rays (infrared rays), thereby removing unnecessary infrared rays. However, even if the infrared rays are cut off, if the liquid crystal panel is continuously irradiated with a strong light beam, the liquid crystal panel generates considerable heat. The heat is particularly concentrated at the center of the surface of the liquid crystal panel due to a variation in the intensity distribution of the irradiation light and causes various adverse effects (such as a decrease in contrast and the occurrence of display unevenness).
[0005]
For this reason, the liquid crystal projector is provided with a cooling mechanism for cooling the liquid crystal panel. As this cooling mechanism, for example, an air cooling device that sends cooling air to a liquid crystal panel using an electric fan is known. Japanese Patent Laying-Open No. 64-29071 discloses a device for sending cooling air from a fan to a liquid crystal panel through a light guide tube forming an optical path. In this device, air generated by a fan located away from the liquid crystal panel is guided to the liquid crystal panel, and the wind is applied to the surface of the liquid crystal panel to perform cooling.
[0006]
Further, in a three-panel projector having three liquid crystal panels for R (red), G (green), and B (blue), a configuration in which an air cooling fan is provided below the liquid crystal panel is known. The air from the fan is supplied from an air outlet provided immediately below the liquid crystal panel toward the vicinity of the lower end surface of the liquid crystal panel. In this configuration, the cooling air flows upward while removing heat from the surface of the liquid crystal panel, thereby cooling the liquid crystal panel.
[0007]
Conventionally, when using these air-cooled cooling mechanisms, a relatively large space for allowing cooling air to pass is provided around the liquid crystal panel. By doing so, the amount of cooling air flowing near the liquid crystal panel can be increased, and the liquid crystal panel can be cooled more effectively.
[0008]
By cooling the surface of the liquid crystal panel in this way, the temperature around the liquid crystal panel can be maintained at a relatively low temperature of, for example, about 50 ° C., and excessive temperature rise is prevented to operate the liquid crystal panel properly. be able to.
[0009]
[Problems to be solved by the invention]
On the other hand, recently, with the development of electronic technology, needs for miniaturization of projection-type image display devices have been increasing from the viewpoint of adaptation to mobile orientation. As a liquid crystal panel, a micro display having a size of less than 1 inch diagonal has been developed, and it is considered that the miniaturization of the liquid crystal projector will be further advanced in the future.
[0010]
However, as the size of the liquid crystal projector is reduced, it becomes more difficult to cool the liquid crystal panel. This is because it becomes difficult to secure a space around the liquid crystal panel that serves as a path for cooling air.
[0011]
In particular, in a three-panel projector having a configuration in which three liquid crystal panels for R (red), G (green), and B (blue) are arranged around a dichroic prism, the optical system is more complicated than a single-panel projector. Because of the complexity and the large number of components, it is not desirable to provide an extra space around the liquid crystal panel in order to reduce the size of the device. In a three-panel type liquid crystal projector, securing a large space around the dichroic prism is a bottleneck for miniaturization of the device.
[0012]
Japanese Patent Application Laid-Open No. Hei 8-21390 describes an apparatus in which a heat radiating member (cooler) is attached to a liquid crystal panel in order to increase the cooling efficiency in an air cooling system. However, this prior art also adds an extra cooler formed of a metal frame or the like to the liquid crystal panel, and thus may not be suitable for downsizing the device. If the miniaturization of the device is promoted, the gap between the surface of the liquid crystal panel and other members adjacent to the liquid crystal panel is considered to be very narrow, but in this case, cooling air is cooled by the cooler attached to the panel. Flow may be obstructed and the cooling efficiency may be reduced.
[0013]
In order to improve the cooling efficiency, it is conceivable to increase the output of the blower and send high-speed wind. However, in this case, there is a problem that noise generated by the wind increases. Liquid crystal projectors are expected to be used in quiet places. In an age where comfortable amenities are important, reducing noise is also an important issue.
[0014]
Further, when it is required to improve the brightness of the image projected on the screen, it is necessary to increase the output of the light source, and in this case, it is important to improve the cooling efficiency of the liquid crystal panel. . Since the amount of heat generated is increased by the square of the light source output, when the cooling efficiency is low, the liquid crystal panel cannot be operated properly.
[0015]
The present invention has been made in view of the above points, and a main object of the present invention is to provide a display element capable of improving the cooling efficiency of a display panel in a form suitable for miniaturization.
[0016]
Another object of the present invention is to provide a projection type liquid crystal display device having the above-mentioned display element.
[0017]
[Means for Solving the Problems]
The display element according to the present invention is a display element having a display panel and a frame that holds a peripheral portion of the display panel, wherein the frame generates cooling air supplied toward the peripheral portion of the display panel. It has a guide for guiding to the surface of the display panel.
[0018]
In a preferred embodiment, the frame protrudes outward from the surface of the display panel, and has substantially no portion that obstructs the flow of cooling air toward the surface of the display panel.
[0019]
In a preferred embodiment, the guide portion includes a guide surface substantially continuous with the surface of the display panel and formed to be inclined from the surface of the display panel, and at least a part of the cooling wind is provided. While being guided along the guide surface, it is guided to the surface of the display panel.
[0020]
In a preferred embodiment, the frame includes a second guide section provided to face the guide section with the display panel interposed therebetween, and the second guide section substantially corresponds to a surface of the display panel. And a second guide surface formed so as to be inclined from the surface of the display panel, so that at least a part of the cooling air passes through the surface of the display panel. Of the cooling air is prevented from stagnating.
[0021]
In a preferred embodiment, in the embodiment, the guide surface includes a curved surface having a substantially arc-shaped cross section formed to extend from a surface of the display panel.
[0022]
In one embodiment, the guide surface has a plurality of blades provided along a direction in which the cooling air flows.
[0023]
In one embodiment, the display device further includes a member that is disposed so as to have a gap between a surface of the display panel and a guide surface of the frame, and that defines an opening through which the cooling air flows into the surface of the display panel. .
[0024]
In one embodiment, an opening is provided so as to have a gap between a surface of the display panel and a second guide surface of the frame, and an opening for discharging cooling air that has absorbed heat accumulated in the display panel. The apparatus further includes a defining member.
[0025]
In a preferred embodiment, the member defining the opening is provided so as to selectively cover a peripheral portion of the display panel, and can shield the peripheral portion of the display panel from light.
[0026]
In one embodiment, the guide section can guide cooling air to both surfaces of the display panel.
[0027]
In one embodiment, the display device further includes a flexible substrate provided with wiring for transmitting an electric signal to the display panel, and an opening is provided in the flexible substrate.
[0028]
In a preferred embodiment, the display panel includes a pair of substrates and a liquid crystal layer sandwiched between the pair of substrates.
[0029]
A projection type liquid crystal display device according to the present invention includes any of the above display elements, a light source for irradiating a display panel of the display element with light, and a blowing unit for generating the cooling air.
[0030]
In a preferred embodiment, the blower is arranged below the display element and supplies cooling air toward a peripheral portion of the display element.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION
The present inventor has described in detail the flow of cooling air when cooling air is supplied from below the display panel with the aim of efficiently cooling the surface of the transmission type display panel on the premise of miniaturization of the projection type display. investigated. As described above, in the projection display, it is not preferable to use a high-output fan. Therefore, a small amount of cooling air is used to efficiently cool the surface (particularly, the center) of the display panel in which heat generation is particularly problematic. This is because it is considered that this is important in realizing the miniaturization of the device.
[0032]
As a result, it has been found that the shape of the frame holding the peripheral portion of the display panel may affect the flow of the cooling air, which may reduce the cooling efficiency of the display panel surface. Here, the frame refers to a member that holds the display panel at the peripheral edge of the display panel, protects the peripheral edge of the display panel formed using a glass substrate or the like, and fixes the display panel at a predetermined position. It can be used for
[0033]
When the cooling air passes along a predetermined surface, if the surface has a large curvature, a vortex (peeling) is generated. In addition, when the cooling air hits a surface provided at an angle of 90 ° with respect to the course of the cooling air, turbulence of the airflow such as a vortex occurs. At this time, a sound is generated together with the vortex. When the flow of the cooling air is deteriorated in this way, the cooling efficiency is reduced, and at the same time, the noise is increased.
[0034]
Such a decrease in the cooling efficiency based on the frame shape is a problem in a projection type display device in which a blower is provided at a position distant from the display panel and configured to send wind to the surface of the display panel. It was not. Another problem is that the projection type display device has a relatively large size and a sufficient space can be secured around the display panel.
[0035]
According to the experiment of the inventor, in the frame shape as shown in FIG. 11A, a part of the wind supplied toward the end face (peripheral portion) of the display panel 90 hits the frame 92, and Does not flow smoothly on the surface of the whirlpool and forms a vortex, which reduces the cooling efficiency. In addition, the formation of the vortex causes an increase in noise.
[0036]
Further, in the frame shape as shown in FIG. 11B, the portion 94 (about 1.5 mm) protruding outward from the panel surface obstructs the flow of cooling air toward the panel surface. As a result, the effect of the cooling air depriving the panel surface of heat is reduced, and noise is also increased by the vortex generated at the protruding portion.
[0037]
From these facts, the present inventor is able to actively guide the cooling air flowing near the frame to the surface of the display panel when supplying the cooling air toward the end face of the display panel. We decided to adopt a simple frame shape. It is desirable that the end face of the frame has a shape that has low resistance to the flow of wind. Further, it is desirable that the frame is not substantially provided with a portion protruding outside the display panel. In the frame, a portion protruding from the display panel is set to about 0.3 mm or less. Thus, the surface of the display panel can be effectively cooled without using a large fan, and the cooling efficiency can be improved in a form suitable for downsizing the device.
[0038]
Note that the display element of the present invention has a configuration in which cooling air is more easily flown to the panel surface, thereby improving the cooling efficiency.As long as this effect is obtained, the cooling efficiency of the panel surface is improved. It can be used in combination with other configurations obtained.
[0039]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0040]
(Embodiment 1)
FIG. 1 is a diagram illustrating an overall configuration of a liquid crystal projector 100 according to the first embodiment.
[0041]
The liquid crystal projector 100 is configured as a three-panel type liquid crystal projector in which a red liquid crystal display element 10R, a green liquid crystal display element 10G, and a blue liquid crystal display element 10B are provided around the dichroic prism 20. .
[0042]
In the liquid crystal projector 100, light (white light) emitted from a light source 11 formed of a metal halide lamp or the like passes through a heat ray cut filter 12 that cuts off heat rays, where excess infrared rays are removed. The light that has passed through the heat ray cut filter 12 passes through the polarizing beam splitter 13, and then a dichroic mirror 14R that selectively transmits only red light, a dichroic mirror 14G that selectively reflects only green light, and only blue light is selected. The light is decomposed into light of the three primary colors by the dichroic mirror 14B that reflects light.
[0043]
The light of each color decomposed as described above is incident on each of the liquid crystal display elements 10R, 10G, and 10B through the corresponding incident-side polarizing plates 16R, 16G, and 16B.
[0044]
The light of each color modulated based on the image information in each of the liquid crystal display elements 10R, 10G, and 10B passes through the output-side polarizing plates 18R, 18G, and 18B, is combined by the dichroic prism 20, and is incident on the projection lens 22. You. The light that has exited the projection lens 22 forms an image on a screen (not shown) provided in front of the light, whereby a desired image is displayed.
[0045]
The layout of the optical system of the liquid crystal projector 100 described above may be similar to that of the conventional liquid crystal projector.
[0046]
FIG. 2 is a cross-sectional view showing the periphery of the dichroic prism 20. In the liquid crystal projector 100, a cooling fan 30 is provided below the liquid crystal display element 10. The cooling fan 30 is rotated by a driving device such as a motor, and can thereby generate cooling air flowing upward. Note that an air intake section 36 having a filter is provided below the cooling fan 30 so that outside air can be taken in from the outside of an aluminum chassis 38 for fixing the optical unit. As the fan 30, for example, D06T-12TS202B11 (DC12V, 0.28 mA) manufactured by NIDEC CORPORATION can be used.
[0047]
Cooling air generated by the fan 30 is supplied from the opening 34 provided in the wind guide plate 32 toward the lower end surface of the liquid crystal display element 10. The cooling air flows upward through a relatively narrow space (for example, a space having a width of about 3 mm) formed between the incident surface of the liquid crystal display element 10 and the polarizing plate 16 while removing heat from the surface of the liquid crystal display element 10. And the liquid crystal display element 10 can be air-cooled.
[0048]
Such a configuration allows cooling air to be supplied from a location close to the liquid crystal panel, and is thus suitable for cooling the liquid crystal display element in the above-described three-panel projector.
[0049]
Further, a flexible substrate 40 provided with wiring for transmitting signals is connected to the liquid crystal display element 10. The other end of the flexible substrate 40 is connected to a connection terminal 44 of a circuit for driving the display element 10. As described above, the operation of the liquid crystal display element 10 can be controlled by applying a predetermined electric signal to the liquid crystal display element 10 from the drive circuit via the connection terminal 44 and the flexible substrate 40.
[0050]
In addition, as shown in FIG. 9, an opening 42 may be provided in the flexible substrate 40. The cooling air that has absorbed heat from the surface of the liquid crystal panel 10 is quickly discharged to the outside through the opening 42, thereby preventing the cooling air from staying near the liquid crystal display element and preventing turbulence. Can be. As a result, the cooling efficiency can be improved.
[0051]
FIG. 3 shows a configuration of the liquid crystal display element 10. The liquid crystal display element 10 includes a liquid crystal panel 1 and a frame 2 that holds the outer periphery of the liquid crystal panel 1. On the light incident side surface 1a and the light emission side surface 1b of the liquid crystal panel 1, light shielding plates 9 for preventing light leakage in a region other than the display region are provided. The light-shielding plate 9 is formed of resin, metal, or the like, and has a thickness of, for example, about 0.15 mm to about 0.25 mm.
[0052]
As the liquid crystal panel 1, a conventional transmission type liquid crystal panel can be used. The liquid crystal panel 1 has a structure in which a liquid crystal layer is sandwiched between a pair of glass substrates. The size of the liquid crystal panel 1 is, for example, a diagonal of 0.7 to 1.3 inches and a thickness of about 4 mm to 6 mm. In the liquid crystal panel 1, a voltage is applied to the liquid crystal layer using a transparent thin film electrode (for example, a matrix of pixel electrodes formed of indium tin oxide) formed on a pair of glass substrates, and a voltage is applied to the liquid crystal layer. Display is performed by changing the optical characteristics.
[0053]
The frame 2 is formed of, for example, resin, and can appropriately protect the peripheral portion of the liquid crystal panel 1. The frame 2 is provided with connection means such as mounting holes 3 and is used to fix the liquid crystal panel 1 at a predetermined position with respect to a dichroic prism or the like.
[0054]
In the present embodiment, an inclined portion 2 a that forms a curved surface having an arc-shaped cross section is formed at the lower end of the frame 2. The surface formed so as to be inclined from the surface of the liquid crystal panel 1 (the “surface formed so as to be inclined” in this specification includes such a curved surface) as described above, The cooling air supplied toward the peripheral portion is smoothly guided to the surface 1a of the liquid crystal panel. Since the cooling air passing near the inclined portion 2a flows along the inclined portion 2a without receiving a large resistance, an undesirable vortex is prevented from being formed by the cooling air.
[0055]
At the upper end of the frame 2, an inclined portion 2b inclined from the panel surface 1a is formed. Thereby, the cooling air that has taken heat from the incident side surface 1a of the liquid crystal panel quickly escapes from the panel surface 1a along the inclined portion 2b, so that it is possible to prevent the cooling air from staying (swirl). it can. Thereby, the liquid crystal panel 1 can be efficiently cooled, and the generation of sound can be prevented.
[0056]
Further, the frame 2 has substantially no portion protruding from the surface of the liquid crystal panel 1, and allows the cooling air to flow along a substantially flat surface. It is desirable that the frame 2 does not include a portion protruding 0.265 mm or more from the surface 1a of the liquid crystal panel. Although a slight step may be formed between the surface of the frame 2 and the surface 1a of the liquid crystal panel 1, in the present specification, when the step is 0.3 mm or less, these steps are substantially continuous. It is considered that a flat surface is formed.
[0057]
In this way, by forming the frame so that the resistance to the flow of cooling air is low, it is possible to supply cooling air with a relatively fast flow to the surface of the liquid crystal panel while preventing the generation of sound. become. Therefore, the cooling air can be effectively used, and the cooling efficiency can be improved to cool the liquid crystal panel uniformly.
[0058]
In the present embodiment, the inclination direction of the inclined portion 2a is set to one direction, so that most of the cooling air from the fan is guided to the panel surface 1a on the light incident side. This is because the temperature of the surface 1a to which the light from the light source is directly radiated becomes higher, so that it is effective to mainly cool the surface 1a on the high-temperature side.
[0059]
However, when the liquid crystal display element 10 is mounted on a position adjustment mechanism (chassis), the emission side surface 1b becomes difficult to cool, and the temperature of the emission side surface 1b may become relatively high. In this case, the frame 4 as shown in FIG. 4 is used to cool the two surfaces 1a and 1b of the panel at a desired ratio (for example, by half) along the entrance side inclined portion 4a and the exit side inclined portion 4b. The wind may be guided. Thus, by appropriately selecting the shape of the frame and controlling the flow of the cooling air in accordance with the temperature of both surfaces of the liquid crystal panel, the entire liquid crystal panel can be more effectively cooled.
[0060]
(Embodiment 2)
FIG. 5 shows a liquid crystal display device according to the second embodiment. The difference between the liquid crystal display device of the second embodiment and the liquid crystal display device of the first embodiment is that a plurality of blades 5 are provided at the lower end (inclined portion 2a) of the frame 2 so as to be along the direction of the flow of the cooling air. It is being done.
[0061]
By providing such blades 5, the flow of the cooling air supplied from the fan to the inclined portion 2a can be stabilized, and the air can be uniformly sent to the liquid crystal panel. In addition, a small vortex may be generated when the cooling wind hits the blade 5. As a result, it is possible to flow a swelling wind that easily takes away heat on the surface of the liquid crystal panel.
[0062]
Further, by providing such blades 5, heat accumulated in the liquid crystal panel 1 and the frame 2 can be radiated also from the blades 5, so that the effect of air cooling the liquid crystal display element is enhanced.
[0063]
Such a mechanism is advantageous in increasing the cooling effect in a liquid crystal display element having a relatively large size.
[0064]
(Embodiment 3)
FIG. 6 shows a liquid crystal display device of the third embodiment. The difference between the liquid crystal display device of the third embodiment and the liquid crystal display device of the first embodiment is that a gap is formed between the light-shielding plate 6 and the panel surface 1a, and the light-shielding plate 6 is provided on the inclined surface 2a of the frame. And 2b. In such a configuration, the opening 6a through which the cooling air from the fan flows into the surface of the liquid crystal panel is defined by the light shielding plate 6 and the inclined surface 2a. In addition, the light shielding plate 6 and the inclined surface 2b define an opening 6b through which the cooling air that has taken heat from the surface of the liquid crystal panel is discharged.
[0065]
The light shielding plate 6 is supported by supporting portions 2c and 2d protruding from the frame 2. However, as shown in FIG. 6C, the support portion 2c is formed at a position where the flow of the cooling air toward the panel surface is not obstructed, and a space 6a through which the cooling air passes is secured. Note that the support 2d is configured similarly to the support 2c.
[0066]
As described above, when the entrance of the cooling air is configured as the opening 6a sandwiched between the light shielding plate 6 and the inclined portion 2a of the frame, the cooling air can be more effectively guided to the surface of the panel. There is also. For example, in the case where high-speed compressed air is used as a means for supplying the cooling air, a high-speed airflow (cooling) that easily takes heat creeping near the panel surface by passing through such a gap 6a. Wind). Further, the light-shielding plate 6 extended as described above has an effect as a wall for forcing the cooling wind, which tends to move outward from the panel surface, toward the panel surface in the vicinity of the inclined portion 2a. You may get it.
[0067]
Further, by providing the opening 6b defined by the light blocking plate 6 and the inclined surface 2b, heat accumulated in the liquid crystal panel 10 can be released by the airflow flowing through the opening 6b. This is because the airflow flowing outside the light-shielding plate 6 causes a negative pressure in the vicinity of the opening 6b, and the generated airflow may take away heat accumulated in the liquid crystal panel. Such an effect is considered to be particularly large in a case where high-speed air compressed in advance is used.
[0068]
(Embodiment 4)
FIG. 7 shows a liquid crystal display device according to the fourth embodiment. The liquid crystal display element shown in FIG. 7 has a configuration having the blades 5 described in the second embodiment (FIG. 5) and a configuration in which a gap is provided between the light shielding plate 6 and the frame 2 described in the third embodiment (FIG. 6) is realized.
[0069]
In the liquid crystal display element according to the fourth embodiment, the provision of the blades 5 makes it possible to supply a wind that easily generates heat and generates heat to the surface of the liquid crystal panel while stabilizing the flow of the cooling wind. At the same time, cooling air can be supplied through the opening 6a between the light-shielding plate 6 and the inclined portion 2a of the frame. Air flow (cooling air) can be supplied.
[0070]
As described above, the display element of the present invention may be configured by combining the configurations of the embodiments, and can achieve a synergistic effect. For example, the blades 5 shown in FIG. 5 can be provided in the inclined portions 4a and 4b configured to supply the cooling air to both sides of the panel as shown in FIG.
[0071]
(Embodiment 5)
FIG. 8 shows a liquid crystal display device according to the fifth embodiment. In the liquid crystal display element of the fifth embodiment, the inclined portions 4a and 4b of the frame are configured to guide cooling air to both surfaces 1a and 1b of the liquid crystal panel, and the incident side surface 1a and the emission side surface 1b of the liquid crystal panel respectively. , Light shielding plates 8a and 8b are provided at a predetermined distance from panel surfaces 1a and 1b.
[0072]
The lower extension portions 80a and 80b of the light shielding plates 8a and 8b have a gap between each of the inclined portions 4a and 4b, and form a path for guiding wind to the panel surfaces 1a and 1b. The lower extension portions 80a and 80b form surfaces parallel to the inclined surfaces of the inclined portions 4a and 4b, so that the cooling air flowing through the gap between them can easily be directed to the panel surface.
[0073]
The lower extension portions 80a and 80b extend beyond the inclined portions 4a and 4b, and an opening for introducing cooling air is formed therebetween.
[0074]
In this way, cooling air is taken in by the light shielding plates 8a and 8b, and a flow toward the both side surfaces of the panel can be formed. If the cooling air can be selectively supplied to the opening defined by the lower extensions 80a and 80b using compressed air or the like, the lower extensions 80a and 80b can be provided like an intake port of a duct. Can work.
[0075]
As described above, the embodiment of the present invention has been described, but the shape of the inclined portion of the frame is not limited to the shape described in the above embodiment, and the cooling air supplied toward the peripheral portion of the display panel is applied to the surface of the display panel. As long as it can be positively guided, various shapes such as those shown in cross sections in FIGS. 10A and 10B can be used.
[0076]
Further, the display element of the present invention can be appropriately used for various display devices in which it is effective to guide cooling air supplied toward the peripheral edge of the display panel to the surface of the display panel.
[0077]
【The invention's effect】
According to the present invention, by improving the shape of the frame, the cooling air flowing along the peripheral edge of the frame can be actively guided to the surface of the display panel, thereby improving the cooling efficiency of the panel surface. With this configuration, the surface of the display panel can be effectively cooled without increasing the size of the display device.
[Brief description of the drawings]
FIG. 1 is a plan view showing a layout of components constituting a liquid crystal projector according to an embodiment of the present invention.
FIG. 2 is a sectional view showing a part of the liquid crystal projector according to the embodiment of the present invention.
3A and 3B are diagrams illustrating a configuration of a liquid crystal display element of Embodiment 1, wherein FIG. 3A is a side view on a light incident side, FIG. 3B is a cross-sectional view, and FIG.
4A and 4B are diagrams showing a configuration of a liquid crystal display element of another embodiment different from the embodiment shown in FIG. 3, wherein FIG. 4A is a side view on the light incident side, and FIG.
5A and 5B are diagrams illustrating a configuration of a liquid crystal display element according to a second embodiment, where FIG. 5A is a side view on the light incident side, FIG. 5B is a cross-sectional view, and FIG. 5C is a bottom end view.
6A and 6B are diagrams illustrating a configuration of a liquid crystal display element according to a third embodiment, where FIG. 6A is a side view on the light incident side, FIG. 6B is a cross-sectional view, and FIG. FIG.
7A and 7B are diagrams illustrating a configuration of a liquid crystal display element according to a fourth embodiment, where FIG. 7A is a side view on the light incident side, FIG. 7B is a cross-sectional view, FIG. FIG. 3B is a cross-sectional view along the line AA in FIG.
8A and 8B are diagrams illustrating a configuration of a liquid crystal display element according to a fifth embodiment, where FIG. 8A is a side view on the light incident side, FIG. 8B is a cross-sectional view, and FIG. FIG.
FIG. 9 is a plan view of a liquid crystal display device according to another embodiment of the present invention.
FIG. 10 is a sectional view of a liquid crystal display device according to another embodiment of the present invention.
FIG. 11 is a sectional view showing an end of a conventional liquid crystal display element.
[Explanation of symbols]
1 LCD panel
1a Light incident side surface
1b Light emitting surface
2 frames
2a, 2b Inclined part
10 Liquid crystal display device
16 Polarizing plate
20 dichroic prism
22 Projection lens
30 cooling fan
32 Wind Guide Board
34 Opening of wind guide plate
36 Wind intake section
38 aluminum chassis
40 Flexible board
42 Opening of Flexible Board
44 Connection terminal

Claims (14)

A display element having a display panel and a frame that holds a peripheral portion of the display panel,
The frame has a guide portion, and has substantially no portion that protrudes outward from the surface of the display panel and that hinders the flow of cooling air toward the surface of the display panel,
The guide portion has a guide surface including an inclined surface substantially continuous with the surface of the display panel, and at least a part of the cooling air supplied toward the peripheral portion of the display panel is provided on the guide surface. A display element guided to the surface of the display panel while moving along the display panel.   The display element according to claim 1, wherein a step between the surface of the frame and the surface of the display panel is 0.3 mm or less. The frame includes a second guide portion provided so as to face the guide portion with the display panel interposed therebetween,
The second guide portion includes a second guide surface substantially continuous with the surface of the display panel, and formed to be inclined from the surface of the display panel,
Thus, the by at least a portion of the cooling air to flow along the second guide surface after passing through the surface of the display panel, according to claim 1 or 2, wherein the cooling air is prevented from stagnating The display element according to 1. The display element according to claim 1, wherein a cross section of the guide surface includes a curved surface. The display element according to claim 4, wherein a cross section of the guide surface includes a substantially arc-shaped curved surface. In the guide surface, the display device according to any one of claims 1 to 5, having a plurality of vanes provided along the direction in which the cooling air flows. Wherein are arranged to form a gap between the surface of the display panel and the guide surface of the frame, according to claim 1, further comprising a member defining an opening for the cooling air flows on the surface of the display panel 7. The display element according to any one of items 1 to 6 . Member defining an opening is arranged to form a gap, to discharge the cooling air that has absorbed the heat accumulated in the display panel between the second guide surface of the surface and the frame of the display panel The display element according to claim 3 , further comprising: The display element according to claim 7, wherein the member that defines the opening is provided so as to selectively cover a peripheral portion of the display panel, and can shield the peripheral portion of the display panel from light. The display element according to claim 1, wherein the guide is capable of guiding cooling air to both surfaces of the display panel. The display device according to claim 1, further comprising a flexible substrate provided with a wiring for transmitting an electric signal to the display panel, wherein an opening is provided in the flexible substrate. The display element according to claim 1, wherein the display panel includes a pair of substrates and a liquid crystal layer sandwiched between the pair of substrates. A display element according to claim 12,
A light source for irradiating light to a display panel of the display element,
Blowing means for generating the cooling air,
Projection type liquid crystal display device comprising: 14. The projection type liquid crystal display device according to claim 13, wherein the blower is arranged below the display element and supplies cooling air toward a peripheral portion of the display element.

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