A projector

Abstract

This application relates to the field of projection devices, and more particularly to a projector, comprising a housing, and a first air duct, a second air duct, and a projection assembly disposed within the housing; the projection assembly includes a first lens, a display screen, and a second lens, wherein the first lens is spaced apart from one side surface of the display screen along its thickness direction to form a first channel, and the second lens is spaced apart from the other side surface of the display screen along its thickness direction to form a second channel; the air outlet of the first air duct communicates with one end of the first channel, and the air outlet of the second air duct communicates with one end of the second channel; the air outlets of the first and second air ducts are located on opposite sides of the display screen along a first direction, such that the airflow direction in the first channel and the airflow direction in the second channel are opposite; there is a non-zero angle between the first direction and the thickness direction of the display screen. This application provides the effect of a uniform temperature display screen.

Description

Technical Field

[0001] This application relates to the field of projection device technology, and more particularly to a projector. Background Technology

[0002] An LCD projector is an optical projection device based on liquid crystal display technology. Its core imaging component, the LCD screen, generates an image by adjusting the arrangement of liquid crystal molecules to change light transmittance. The stability, lifespan, and display quality of this component are highly sensitive to operating temperature: excessively high temperatures not only accelerate the thermal decomposition of liquid crystal molecules, causing display defects such as black spots and uneven brightness, but also reduce light efficiency. To maintain brightness, power needs to be increased, creating a vicious cycle of light loss and heat generation, ultimately significantly shortening the LCD screen's lifespan until it fails. Therefore, efficient heat dissipation is crucial to ensuring the performance and reliability of an LCD projector.

[0003] As a core optical component, the LCD screen cannot be cooled by conduction and relies primarily on forced convection cooling. In existing single-sided air supply solutions, the cooling airflow is continuously heated as it flows over the LCD screen, resulting in a significantly higher temperature on the exhaust side than on the intake side. This leads to uneven temperature distribution on the LCD screen, causing variations in the stability of liquid crystal molecule alignment. Consequently, this affects the uniformity of brightness and color distribution, negatively impacting projection quality. Summary of the Invention

[0004] This application provides a projector designed to improve the problem of uneven temperature distribution on a display screen.

[0005] This application provides a projector, including a housing, a first air duct, a second air duct, and a projection component disposed within the housing; the projection component includes a first lens, a display screen, and a second lens, wherein the first lens is spaced apart from one side surface of the display screen in the thickness direction to form a first channel, and the second lens is spaced apart from the other side surface of the display screen in the thickness direction to form a second channel. The air outlet of the first air duct is connected to one end of the first channel, and the air outlet of the second air duct is connected to one end of the second channel; The air outlets of the first air duct and the second air duct are located on opposite sides of the display screen along the first direction, so that the airflow direction in the first channel is opposite to the airflow direction in the second channel. There is a non-zero angle between the first direction and the thickness direction of the display screen.

[0006] Optionally, a first fan and a second fan may also be included; The outlet of the first fan is connected to the first air duct, and the outlet of the second fan is connected to the second air duct.

[0007] Optionally, the first air duct includes a first segment and a second segment connected in sequence, with a non-zero angle between the length directions of the first segment and the second segment, the first segment being connected to the first fan, and the second segment being connected to the first channel.

[0008] Optionally, the connection between the first segment and the second segment is smoothly transitioned.

[0009] Optionally, the second air duct includes a third segment and a fourth segment connected in sequence, wherein the length directions of the third segment and the fourth segment form a non-zero angle; the third segment is connected to the second fan, and the fourth segment is connected to the second channel.

[0010] Optionally, the connection between the third segment and the fourth segment is smoothly transitioned.

[0011] Optionally, the widths of the first channel and the second channel are equal along the first direction.

[0012] Optionally, the projection assembly further includes a light source and a reflector, wherein the light source and the first lens are located at opposite ends of the reflector, and the inner diameter of the reflector gradually increases from the light source to the first lens.

[0013] Optionally, the display screen is an LCD screen.

[0014] Optionally, both the first lens and the second lens are Fresnel lenses.

[0015] This embodiment introduces cooling airflow simultaneously from opposite sides of the display screen, bringing the air inlet of the first channel close to the air outlet of the second channel. This raises the temperature of the higher airflow in the second channel relative to the lower airflow temperature of the display screen in the first channel, significantly reducing the temperature difference and resulting in a more uniform overall temperature distribution. This fundamentally suppresses the differences in liquid crystal molecule alignment stability caused by temperature gradients, thereby ensuring high uniformity of brightness and color in the projected image. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the gas flow direction of a projector provided in one embodiment of this application.

[0017] Explanation of reference numerals in the attached figures: 101. First fan; 102. First air duct; 1021. First section; 1022. Second section; 103. First lens; 104. Display screen; 105. Second lens; 106. Second air duct; 1061. Third section; 1062. Fourth section; 107. Second fan; 108. Reflector; 109. Light source. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] This application provides a projector, including a housing, and a first air duct 102, a second air duct 106, and a projection assembly disposed within the housing. The projection assembly includes a first lens 103, a display screen 104, and a second lens 105. The first lens 103 is spaced apart from one side surface of the display screen 104 along its thickness direction to form a first channel, and the second lens 105 is spaced apart from the other side surface of the display screen 104 along its thickness direction to form a second channel. The air outlet of the first air duct 102 communicates with one end of the first channel, and the air outlet of the second air duct 106 communicates with one end of the second channel. The air outlets of the first air duct 102 and the second air duct 106 are located on opposite sides of the display screen 104 along a first direction, so that the airflow direction in the first channel is opposite to the airflow direction in the second channel. There is a non-zero angle between the first direction and the thickness direction of the display screen 104. In this embodiment, the display screen 104 is an LCD screen; the first lens 103 and the second lens 105 are both Fresnel lenses. The first direction is perpendicular to the thickness direction of the display screen 104.

[0020] This embodiment effectively overcomes the shortcomings of traditional single-sided air supply technology: the uneven temperature of the display screen 104 caused by the temperature increase downstream of the airflow direction, resulting in a lower temperature upstream of the flow direction compared to the downstream direction. This embodiment simultaneously supplies cooling airflow from opposite sides of the display screen 104, making the air inlet of the first channel close to the air outlet of the second channel. This raises the temperature of the higher airflow in the second channel relative to the lower airflow temperature of the display screen 104 in the first air duct 102, significantly reducing the temperature difference and making the overall temperature distribution of the display screen 104 more uniform. This fundamentally suppresses the differences in liquid crystal molecule alignment stability caused by temperature gradients, thereby ensuring high uniformity of brightness and color in the projected image.

[0021] Secondly, bidirectional convection cooling significantly improves heat dissipation efficiency. By simultaneously applying forced convection heat exchange to both sides of the display 104, heat removal is accelerated, enabling the display 104 to operate within a lower and more stable temperature range.

[0022] In one embodiment, the system further includes a first fan 101 and a second fan 107; the air outlet of the first fan 101 is connected to a first air duct 102, and the air outlet of the second fan 107 is connected to a second air duct 106. In this embodiment, air cooling is achieved through the first fan 101 and the second fan 107.

[0023] In one embodiment, the first air duct 102 includes a first segment 1021 and a second segment 1022 connected in sequence. The length directions of the first segment 1021 and the second segment 1022 form a non-zero angle. The first segment 1021 connects to the first fan 101, and the second segment 1022 connects to the first channel. The first air duct 102 has an overall L-shaped structure, which can fully utilize the irregular space inside the projector, effectively bypassing other core components such as the optical engine and circuit board, achieving a more compact layout. This segmented L-shaped structure not only enhances the adaptability of the air duct within the limited housing but also significantly reduces the overall thickness and volume, facilitating the miniaturization and lightweight design of the projection device. Simultaneously, this structure helps guide airflow to turn and transport more smoothly, reducing eddies and pressure loss, thereby maintaining good heat dissipation efficiency within a limited space and improving the rationality of the overall structural design and space utilization.

[0024] In one embodiment, the connection between the first segment 1021 and the second segment 1022 is smoothly transitioned. If the transition between the first segment 1021 and the second segment 1022 is too sharp, it will cause a strong airflow separation phenomenon, forming a vortex region. These vortices will not only create huge local resistance to the airflow, resulting in significant wind pressure loss, but will also cause the airflow speed and effective flow rate to drop sharply.

[0025] To address this issue, a smooth, curved transition design is key. This design guides the airflow to change direction smoothly, minimizing vortex generation and boundary layer separation, thereby reducing local drag losses. Its direct advantage is that the first fan 101 can maintain higher outlet dynamic pressure with lower operating power, thus ensuring airflow velocity and volume. This airflow pattern means that more heat can be removed per unit time, directly improving the heat exchange efficiency of the entire active cooling system.

[0026] In one embodiment, the second air duct 106 includes a third segment 1061 and a fourth segment 1062 connected in sequence, with a non-zero angle between the length directions of the third segment 1061 and the fourth segment 1062; the third segment 1061 connects to the second fan 107, and the fourth segment 1062 connects to the second channel. Similarly, the first air duct 102 includes a first segment 1021 and a second segment 1022, which will not be described in detail here.

[0027] In one embodiment, the connection between the third and fourth segments is smoothly transitioned. Similarly, the connection between the first segment 1021 and the second segment 1022 is also smoothly transitioned, and will not be described in detail.

[0028] In one embodiment, the first channel and the second channel have equal widths along a first direction. The first and second channels are typically used to dissipate heat from the two side surfaces of the display screen 104, a core component of the projector that generates considerable heat. The equal widths of the first and second channels mean that the cross-sectional areas of the airflow channels providing heat dissipation are essentially the same. This ensures that the cooling airflow carries away heat with similar efficiency as it passes through these two critical areas, thus preventing abnormally high temperatures in one component due to uneven heat dissipation and ensuring the stability and consistency of the overall thermal management.

[0029] In one embodiment, the projection assembly further includes a light source 109 and a reflector 108, with the light source 109 and the first lens 103 located at opposite ends of the reflector 108, and the inner diameter of the reflector 108 gradually increasing from the light source 109 to the first lens 103.

[0030] In this embodiment, the first lens 103, a Fresnel lens close to the light source 109, organizes scattered light rays into a "parallel procession" with consistent steps and correct directions, guiding them towards the display screen 104. The second lens 105, a Fresnel lens away from the light source 109, ensures that every ray of light emanating from the LCD screen 104 accurately enters the projector's projection lens.

[0031] In this application, "multiple" refers to two or more.

[0032] In this application, unless otherwise expressly defined, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] The terms “first,” “second,” “third,” “fourth,” etc., in this application (if present) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0034] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0035] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, if the method includes steps A and B, it means that the method may include steps A and B performed sequentially, or it may include steps B and A performed sequentially. For example, if the method may also include step C, it means that step C may be added to the method in any order. For example, the method may include steps A, B, and C, or it may include steps A, C, and B, or it may include steps C, A, and B, etc.

[0036] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A projector, characterized in that, The device includes a housing, and a first air duct, a second air duct, and a projection assembly disposed within the housing. The projection assembly includes a first lens, a display screen, and a second lens. The first lens is spaced apart from one side surface of the display screen in the thickness direction to form a first channel, and the second lens is spaced apart from the other side surface of the display screen in the thickness direction to form a second channel. The air outlet of the first air duct is connected to one end of the first channel, and the air outlet of the second air duct is connected to one end of the second channel; The air outlets of the first air duct and the second air duct are located on opposite sides of the display screen along the first direction, so that the airflow direction in the first channel is opposite to the airflow direction in the second channel. There is a non-zero angle between the first direction and the thickness direction of the display screen.

2. The projector according to claim 1, characterized in that, It also includes the first and second fans; The outlet of the first fan is connected to the first air duct, and the outlet of the second fan is connected to the second air duct.

3. The projector according to claim 2, characterized in that, The first air duct includes a first segment and a second segment connected in sequence. The length directions of the first segment and the second segment have a non-zero angle. The first segment is connected to the first fan, and the second segment is connected to the first channel.

4. The projector according to claim 3, characterized in that, The connection between the first segment and the second segment is smoothly transitioned.

5. The projector according to claim 2, characterized in that, The second air duct includes a third section and a fourth section connected in sequence, with a non-zero angle between the length directions of the third section and the fourth section; the third section is connected to the second fan, and the fourth section is connected to the second channel.

6. The projector according to claim 5, characterized in that, The connection between the third segment and the fourth segment is smoothly transitioned.

7. The projector according to claim 1, characterized in that, The widths of the first channel and the second channel are equal along the first direction.

8. The projector according to claim 1, characterized in that, The projection assembly also includes a light source and a reflector. The light source and the first lens are located at opposite ends of the reflector, and the inner diameter of the reflector gradually increases from the light source to the first lens.

9. The projector according to claim 1, characterized in that, The display screen is an LCD screen.

10. The projector according to claim 1, characterized in that, Both the first lens and the second lens are Fresnel lenses.

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