JP-2026076210-A - Projection-type image display device

JP2026076210AJP 2026076210 AJP2026076210 AJP 2026076210AJP-2026076210-A

Abstract

[Problem] To provide a projection-type image display device that cools heat-generating components in a sealed state. [Solution] The projection-type image display device 1 according to the present disclosure is a projection-type image display device comprising a light source and an image display element into which light from the light source is incident, comprising: a first housing that houses the light source and the image display element and forms a sealed first space X1; a second housing that encloses the first housing and forms a second space X2 with the first housing, and has an outside air intake port 113 and an outside air exhaust port 111; a first heat exchanger 104 disposed in the second space that transfers the heat of the image display element to the outside air in the second space; a second heat exchanger 117 disposed in the second space that transfers the heat of the light source to the outside air in the second space; and a first blower disposed in the second space that takes in outside air into the second space through the intake port and discharges outside air from the second space through the exhaust port. [Selection Diagram] Figure 1

Inventors

山岸成多
松井繁佳

Assignees

パナソニックプロジェクター＆ディスプレイ株式会社

Dates

Publication Date: 20260511
Application Date: 20260114
Priority Date: 20220912

Claims (16)

A projection-type image display device comprising a light source and an image display element into which light from the light source is incident, A first housing that houses the light source and the image display element and forms a sealed first space, A second housing encloses the first housing, forming a second space between it and the first housing, and having an air intake port for outside air and an air exhaust port for outside air, A first heat exchanger is placed in the second space and transfers the heat of the image display element to the outside air in the second space, A second heat exchanger is placed in the second space and transfers the heat of the light source to the outside air in the second space, A projection-type image display device comprising: a first blower positioned in the second space, which takes in outside air into the second space through the intake port and discharges the outside air from the second space through the exhaust port.
The first heat exchanger has a partition wall that defines an internal airflow path on one side and an external airflow path on the other side, The internal air passage has an inlet and an outlet that communicate with the first space, The aforementioned outside air passage is in contact with the aforementioned inside air passage via the partition wall and allows outside air to pass through. The system further comprises a second blower, which is positioned in the first space and guides the internal air in the first space into the internal air passage, passes it through the internal air passage, and guides it to the image display element. The projection-type image display device according to claim 1, wherein the first blower guides outside air from the second space into the outside air passage, causes it to pass through the outside air passage, and discharges it through the exhaust port.
A first duct extending between the outlet of the internal air passage of the first heat exchanger and the second blower, The projection-type image display device according to claim 2, further comprising a second duct extending between the second blower and the image display element.
The third duct further comprises the image display element and the inlet of the internal air passage of the first heat exchanger, The projection-type image display device according to claim 3, wherein the power supply for the light source is housed in the third duct.
The projection-type image display device according to claim 4, further comprising a third blower for introducing air into the third duct.
The first duct forms the first flow path, The second duct forms a second flow path, The third duct forms a third flow path, The projection-type image display device according to claim 4, wherein the image display element is housed and a fourth channel is formed that communicates with the second channel.
A third heat exchanger is connected to the aforementioned image display element. The first duct forms the first flow path, The second duct forms a second flow path, The third duct forms a third flow path, The projection-type image display device according to claim 4, wherein the third heat exchanger is housed and a fourth flow path is formed that communicates with the second flow path.
The projection-type image display device according to claim 1, wherein the second heat exchanger is a heat sink connected to the light source.
The second housing has a first intake port and a second intake port as the air intake ports, The first heat exchanger is positioned closer to the first air intake than the second air intake. The projection-type image display device according to claim 1, wherein the second heat exchanger is positioned closer to the second air intake than the first air intake.
The projection-type image display device according to claim 9, further comprising a fourth blower positioned in the second space and drawing in outside air into the second space through the second air intake and directing it to the second heat exchanger.
The projection-type image display device according to claim 2, wherein the partition wall has a corrugated shape.
The projection-type image display device according to claim 1, wherein the first blower is a waterproof or oil-resistant axial fan or sirocco fan.
The projection-type image display device according to claim 1, wherein the first housing and the second housing have a common base as their bottom.
The first housing is made of resin, The projection-type image display device according to claim 1, wherein the second housing is made of metal.
The projection-type image display device according to any one of claims 1 to 14, wherein the first housing includes the image display element and houses a projection optical system that projects modulated light.
The projection-type image display device according to claim 2, wherein the direction of airflow in the internal air passage and the direction of airflow in the external air passage are opposite.

Description

This disclosure relates to a projection-type image display device. Projection-type image display devices irradiate image display elements, such as liquid crystals, with powerful illumination light, and project the image displayed on the image display elements using a projection lens. During this process, the image display elements absorb some of the light, causing them to generate heat. Furthermore, because the projected light has high energy, the light source also generates heat. Therefore, there is a need to effectively remove heat from both the image display elements and the light source. It is common practice to incorporate outside air into projection-type image display devices to cool heat-generating components. However, this also introduces dust and debris into the device. This dust and debris can degrade image quality by adhering to the optical system, or it can become a source of heat generation when exposed to light. To prevent dust and debris from entering, a dust filter is installed at the outside air inlet. In this configuration, regular maintenance, such as replacement and cleaning of the dust filter, is required. In light of these challenges, for example, the projection-type image display device described in Patent Document 1 has been proposed. Patent Document 1 discloses a projection-type image display device comprising multiple blowers for cooling a liquid crystal panel mounted on an illumination optical system, a heat sink for removing heat from the air blown out by the blowers, and a dustproof case. The dustproof case houses the illumination optical system, blowers, and heat sink and has a sealed structure. International Publication No. 2019/225679 Plane conceptual diagram of the overall configuration of the projection-type image display device according to Embodiment 1Side view conceptual diagram of the overall configuration of a projection-type image display device.Schematic diagram showing airflow in a projection-type image display device.Schematic perspective view showing the arrangement of a projection-type image display device.Front cross-sectional view in Figure 4Cross-sectional view obtained by changing the cross-sectional position parallel to Figure 5A.Top cross-sectional view in Figure 4Perspective view of the first heat exchangerPerspective view of the partition wall contained within the first heat exchanger.Diagram showing the optical configurationA diagram showing the optical configuration of a projection-type image display device according to Embodiment 2.Top cross-sectional view of projection-type image display device according to Embodiment 2Cross-sectional view with the cross-sectional position changed vertically from Figure 10.Cross-sectional view of the intake section of the projection-type image display device according to Embodiment 2.Lower cross-sectional view of projection-type image display device according to Embodiment 2 The embodiments will be described in detail below, with reference to the drawings as appropriate. However, unnecessarily detailed explanations may be omitted. For example, detailed explanations of already well-known matters or redundant explanations of substantially identical configurations may be omitted. This is to avoid unnecessarily verbose explanations and to facilitate understanding for those skilled in the art. The attached drawings and the following description are provided to enable those skilled in the art to fully understand this disclosure and are not intended to limit the subject matter described in the claims. Furthermore, elements in each drawing are exaggerated for the sake of clarity. (Embodiment 1) Figure 1 is a plan view conceptual diagram of the overall configuration of the projection-type image display device 1 according to Embodiment 1. Figure 2 is a side view conceptual diagram of the overall configuration of the projection-type image display device 1. Ideally, each RGB optical path should be explained, but in Figure 2, due to drawing constraints, only the two liquid crystal units 200 are mentioned, and the configuration of the circulation fan 503 is omitted from the illustration. As shown in Figure 1, the projection-type image display device 1 includes an optical configuration 100, a first housing 500, a second housing 101, a base 118, a first heat exchanger 104, a second heat exchanger 117, outside fans 103 and 114, circulation fans 501 to 503, a power supply 511, and a power supply fan 512. The optical configuration 100 is composed of multiple optical systems and includes a light source unit 300 and an illumination optical unit 400 including a liquid crystal unit 200. The optical configuration 100 guides light from the light source unit 300 to the illumination optical unit 400, and projects the image or video displayed on the liquid crystal unit 200 onto a screen (not shown) using a projection lens 421. In Embodiment 1, the light source unit 300 includes a laser light source 301, and the illumination optical unit 400 incl