48 results about "LCD projector" patented technology

A phase difference sheet including a substrate and a phase difference film as a tilt film, wherein, in a biaxial refractive index ellipsoid exhibiting a refractive index anisotropy, of three principal refractive indexes nx, ny, nz, the principal refractive index in the length direction of a columnar structure, i.e., the X-axis direction, is nx, the principal refractive index in the major axis direction of an ellipse perpendicular to the X-axis, i.e., the Y-axis direction, is ny, and the principal refractive index in the minor axis direction, i.e., the Z-axis direction, is nz, the following conditional expression (1) is satisfied, and, in a case where the incident angle of a direction tilted to the X-axis side with the normal as a reference is positive, the phase difference of incident light at an incident angle of +30° is Re(+30), the phase difference of incident light at an incident angle of -30° is Re(-30), and the ratio of Re(+30) to Re(-30), i.e., the phase difference ratio, is Re(30) ratio, the following conditional expression (2) is satisfied, ny > nx > nz (1), Re(30) ratio = Re(30) / Re(-30) = 1.1 to 4.0 (2).

The utility model relates to a closed light machine for a vertical projector and an LCD projector. The closed light machine comprises a housing, an internal circulation fan, an imaging assembly, a heat exchange module, a light source assembly, an external circulation fan and an LED radiator. The internal circulation fan is arranged in the shell, an internal circulation air channel communicated with an air inlet and an air outlet of the internal circulation fan is formed in the shell, the imaging assembly comprises an LCD screen located in the internal circulation air channel, air in the internal circulation air channel flows through the two opposite sides of the LCD screen, and the air in the internal circulation air channel is communicated with the air inlet and the air outlet of the internal circulation fan. The direction of air flowing through one side of the LCD screen is opposite to the direction of air flowing through the other side of the LCD screen, according to the closed light machine, heat dissipation is conducted on the LCD screen in an internal circulation mode, miniaturization of the light machine is facilitated, in addition, heat dissipation can be conducted on the hot face radiator and the LED radiator at the same time through the external circulation draught fan, and the overall layout is compact.

The invention relates to the technical field of projectors, and discloses a picture calibration method and device, a projector and a medium. The method comprises the following steps: acquiring attitude angle information and positioning and orientation information of a projection lens; the positioning and orientation information represents distances and directions of the projection lens relative to at least three non-collinear reference points in a projection plane; determining three-dimensional included angle information between the projection plane and the optical axis of the projection lens based on the attitude angle information and the positioning and orientation information; performing angle calculation on the LCD screen based on the three-dimensional included angle information so as to calculate a target pitch angle value and a target deflection angle value which the LCD screen needs to reach; and driving the screen adjusting component to adjust the angle of the LCD screen by taking the pitch angle and the deflection angle of the LCD screen respectively reaching the target pitch angle value and the target deflection angle value. According to the embodiment of the invention, the projection picture quality of the single-chip LCD projector during side projection can be improved.

The invention discloses a double-LCD projector, two paths of LED light sources which are vertically arranged are adopted for illumination, the first path of LED light source in the two paths of LED light sources comprises a first LED light source, fluorescent powder, a light hopper, a first rear Fresnel lens, a first light filter, a first polaroid, a first LCD screen and a first front Fresnel lens which are sequentially arranged from back to front, and the fluorescent powder is arranged on the first LED light source; the second path of LED light source comprises a second LED light source, an aspherical lens, a reflector, a second rear Fresnel lens, a second optical filter, a second polaroid, a second LCD screen and a second front Fresnel lens which are sequentially arranged from back to front; the double-LCD projector further comprises a double-gluing two-phase-color light combining mirror, and the double-gluing two-phase-color light combining mirror, the first front Fresnel lens and the second front Fresnel lens are arranged in a 45-degree mode. According to the invention, the length-width ratio of a horizontal light path and a vertical light path can be effectively avoided, and the light deviation after light combination is reduced.

The utility model relates to a totally enclosed LCD projector heat radiation structure comprising a projector main body, the projector main body is provided with a heat radiation unit, the projector main body is provided with a fan corresponding to the heat radiation unit, the air outlet end of the fan forms an air channel, and the heat radiation unit is located in the air channel; the projector main body comprises a rack, a light machine main body, an LCD display screen, a reflection cup and a light source which are connected in sequence, the fan corresponds to the light machine main body, the LCD display screen and the reflection cup are arranged on the rack, and part of the light machine main body, the LCD display screen and the reflection cup are all located in the air duct. The heat dissipation unit is arranged corresponding to the light machine body, the part of the reflection cup located in the air channel, the LCD display screen and the light source. According to the totally-enclosed heat dissipation structure of the LCD projector, the heat dissipation problem of each heating part of the projector can be solved through a single fan, and a plurality of fans are not needed for heat dissipation, so that a structural frame is simple, the space utilization rate is maximized, an effective air duct is formed, and the totally-enclosed heat dissipation structure of the LCD projector has better market competitiveness.

The utility model discloses an internal and external circulation heat radiation system of a single-chip LCD projector, which comprises a second heat radiator, a single stator arranged on the inner side of a first heat radiator, a linkage rotor fan and a rotor fan which are connected with the single stator, and a third heat radiator arranged at an air outlet of the linkage rotor fan, the light cup and the LED lamp assembly are arranged at an air outlet of the third radiator, the first radiator is arranged at an air outlet of the rotor fan, the first Fresnel lens, the heat insulation glass and the LCD screen are vertically arranged at an air outlet of the first radiator at intervals, and the second Fresnel lens is arranged on the outer side of the LCD screen at intervals. The linkage rotor fan and the rotor fan are arranged at intervals, and the first Fresnel lens, the heat insulation glass and the LCD screen are arranged at intervals to form two sets of air channels. According to the utility model, the temperature of the liquid crystal screen can be effectively controlled, and the service life of the fan is effectively prolonged.

The disclosure provides a new field sequential single LCD projector, includes an LED light source, a collecting and collimating device, a light-combining and color-filtering device, an intermediate reflector, a focusing device, a light-homogenizing device, an outgoing lens, a LCD light valve, a field lens, an imaging reflector and a projection lens which are arranged in sequence according to the light traveling direction. The LED light source includes a red light source, a green light source and a blue light source. Compared with the existing full-color light valve technology, under the same technical condition, the efficiency of the light valve is greatly improved, the power of the light source is greatly reduced, and the image color gamut is greatly improved, so that the projector can output higher brightness and has vast market adaptability.

The invention relates to a double-fan light leakage prevention open type light machine and an LCD projector. The open type light machine comprises a light machine shell, an imaging assembly, a first fan, a second fan and an air outlet bend shell. The imaging assembly is arranged in the imaging cavity to divide the imaging cavity into a first cooling air duct, a second cooling air duct and a light emitting cavity, the light machine shell is further provided with an air inlet shading grating structure communicating with the top of the light emitting cavity, and a plurality of heat dissipation air inlet gaps are formed in the air inlet shading grating structure; the first fan is arranged below the ray machine shell, the second fan is arranged above the ray machine shell, and the first fan and the second fan are arranged in a central symmetry mode relative to the central point of the LCD screen when observed in the vertical direction; the air outlet bend shell communicates with the lower end of the second cooling air duct. According to the arrangement mode of the first draught fan and the second draught fan, the problem that the LCD screen color is not uniform is effectively solved, and the light leakage problem can be solved through the arrangement of the air inlet shading grating structure and the air outlet curve shell above the light machine shell.

The utility model relates to a phase change heat dissipation low-noise closed light machine and an LCD projector. The closed light machine comprises a shell, an optical device, an internal circulation fan and a heat dissipation module. An internal circulation air duct is formed in the shell, the optical device and the internal circulation fan are both arranged in the internal circulation air duct, and the optical device comprises an LCD screen; the heat dissipation module comprises a fin radiator and a heat sink component, the heat sink component with the phase change material is adopted in the closed light machine and serves as an external heat dissipation part of the closed light machine, heat dissipation is conducted on the fin radiator in a heat storage mode, and the heat dissipation efficiency of the heat sink component is improved. Compared with the prior art that an outer fan is arranged outside the shell to cool the heat dissipation system, the closed optical machine has the advantages of being reasonable in heat dissipation function, low in noise, convenient to use by a user, good in heat dissipation effect, high in heat dissipation efficiency and good in mute effect.

The utility model relates to a multi-fan heat dissipation open type optical machine and an LCD projector. The multi-fan heat dissipation open type optical machine comprises an optical machine shell, a first heat dissipation fan, a second heat dissipation fan and a bottom heat dissipation fan. An LCD screen is installed in the light machine shell, a heat dissipation air channel passing through the two sides of the LCD screen is formed in the light machine shell, the heat dissipation air channel is provided with an air inlet, a first air outlet and a second air outlet which are communicated with the outside, the air inlet and the first air outlet are located at the two opposite ends of the heat dissipation air channel in the horizontal direction, and the second air outlet is located at the bottom of the heat dissipation air channel in the vertical direction. According to the multi-fan heat dissipation open type optical machine, heat dissipation of the open type optical machine can be completed in a low-cost mode through the design of the air channels and the mutual cooperation effect of series connection of the fans under the condition that semiconductor chilling plates, a large number of radiators, liquid cooling and other heat dissipation modes are not used, airflow interference between the fans is avoided, smooth air flow is ensured, and the service life of the optical machine is prolonged. The heat dissipation efficiency is improved, the overall power consumption and size are reduced, and economy and high efficiency are achieved.

The utility model relates to a low-cost liquid crystal projector which comprises an LED lamp module, an optical polarizing film, a light hopper, an LCD light valve, a first Fresnel lens, a liquid crystal display screen, a second Fresnel lens, a reflecting mirror and a projection lens, and an optical path is arranged between the LED lamp module and the projection lens. The optical polarizing film, the light hopper, the LCD light valve, the first Fresnel lens, the liquid crystal display screen, the second Fresnel lens and the reflector are sequentially arranged at intervals in the length direction of an optical path. Through the front optical polarizer, the size of the optical polarizer does not need to be increased along with the enlargement of the size of the liquid crystal display screen, the cost of the optical polarizer is effectively reduced, and the overall production cost of the liquid crystal projector is further reduced.

The present disclosure provides a LCD projector with multiple display screens and lenses, comprising: light sources, collimating lenses, LCD imagers, field lenses and imaging lenses; the collimating lenses, the LCD imagers, the field lenses and the imaging lenses are sequentially arranged on the optical path emitted by the light sources; the collimating lenses, the LCD imagers and the field lenses are all arranged in parallel; the vertical axes of the collimating lenses, the LCD imagers and the field lenses are maintained on the same axes as the vertical axes of the light emitted by the light sources; the light sources, the collimating lenses, the LCD imagers, the field lenses and the imaging lenses constitute a plurality of groups of imaging groups.

A display method based on an LCD projector and an LCD projector, relating to the field of projectors. The method includes: identifying an occluding object in the projection area of the LCD projector; performing face recognition on the occluding object, and if the occluding object contains a face, determining the occluding object as an occluding person; performing facial recognition on the occluding person to obtain facial expressions, and performing gesture recognition on the occluding person to obtain body movements; detecting the staying time of the occluding person in the projection area, and if the staying time is greater than a preset time threshold, identifying whether the occluding person is a target person according to the facial expressions and body movements; if it is a target person, determining the position of the human body contour in the projection area and determining the occluded projection area occupied; adjusting the projection parameters of the occluded projection area so that the visibility of the occluded projection area is higher than a preset visibility threshold. Implementing this method can improve the demonstration effect of the LCD projector.

The present invention discloses a heat reflection light valve of an LCD (Liquid Crystal Display) projector and a projector. The heat reflection light valve comprises an upper glass substrate, a lower glass substrate and a liquid crystal box clamped between the upper glass substrate and the lower glass substrate, and a TFT (Thin Film Transistor) array is produced on the lower glass substrate; and a CF (Color Filter), a BM (Black Matrix), an OC (Over Coater), a transparent electrode and a post spacer are produced on the upper glass substrate. A layer of reflection film for reflecting blue light is produced on the inner surface of the upper glass substrate, and the reflection film is not produced in a region corresponding to a blue filter matrix of the CF.

The single-piece LCD projection lens is formed by combining three different spherical lenses, the transfer function is larger than 50% at 14lp / mm, the TV distortion is smaller than 0.2%, and the single-piece LCD projection lens is suitable for a high-definition (1920 * 1080 resolution) single-piece 3.12-inch LCD projector. The focal length is 95 mm, the F / # is 2.8, and the projection ratio is 1.25.

The application relates to an active refrigeration type inner circulation heat dissipation LCD projector and a heat dissipation method, the projector comprising a shell, a first projection channel arranged vertically and a second projection channel arranged horizontally in the shell, a reflection module, an LCD panel module, a light collecting cover, a light source module and a lens module; an inner circulation heat dissipation channel is arranged in the shell, a semiconductor refrigeration module is arranged on the inner circulation heat dissipation channel, and an inner circulation fan for realizing air circulation is arranged; the inner circulation heat dissipation channel extends from the light inlet end of the first projection channel to the light outlet end of the second projection channel along the length direction of the first projection channel and the second projection channel in sequence, the LCD panel module is arranged on the inner circulation heat dissipation channel, and the inner circulation fan is arranged below the lens module; the semiconductor refrigeration module realizes active inner circulation heat dissipation, avoids dust from entering the projector, efficiently dissipates heat for the LCD panel module, and fully utilizes the position below the lens module to arrange the inner circulation fan.

The utility model discloses a closed LCD projector with double supports, and relates to the technical field of projector equipment. The upper cover is connected with the partition type bottom shell, the projector shell is connected with the partition type bottom shell, the front end of one side of the partition type bottom shell is a display area cavity, the rear end of one side of the partition type bottom shell is an LED light source cavity, the rear end of the display area cavity is provided with a vertically-placed display screen, and the rear end of the display screen is provided with a horizontally-placed first cooling fin set. The projector comprises a projector shell, a display area cavity is arranged in the projector shell, a horizontally-placed second cooling fin set is arranged on the side portion of the display area cavity, movable supports are arranged on the two sides of the projector shell, the first support and the second support are movably connected through fixing nails, and the partition type projector shell is arranged, and cooling fins are arranged in the projector shell for heat dissipation. The rear end of the partition closed shell is further provided with a heat conduction fan for heating the cooling fins to dissipate heat, so that closed cooling is achieved, meanwhile, the projector is supported through the movable double supports, the projector can be conveniently placed on a table top and hung for use, and better use experience is brought to a user.

The utility model discloses a liquid crystal projector and an optical system thereof, the optical system of the liquid crystal projector comprises a light source, a liquid crystal panel and a liquid crystal light valve located between the light source and the liquid crystal panel, and the liquid crystal light valve is stacked on the liquid crystal panel; the liquid crystal panel comprises a plurality of display units which are uniformly arranged; the liquid crystal light valve comprises a plurality of light valve units which are in one-to-one correspondence with the display units; the light valve unit is configured to transmit or cut off light emitted from the light source to the corresponding display unit; according to the projector, the problem that the contrast ratio cannot be improved by partition dimming when an LED light source is matched with an LCD display screen in an existing projector can be solved.

The application relates to a high-definition LCD projector with a self-cleaning lens module. The air flow curtain in a sag state plays the role of effectively closing and isolating the lens from external dust for a long time. When needed, the air flow is bidirectionally flowed on the air flow curtain, the air flow is sprayed to the lens surface in a ring-shaped dispersion state, the surface dust of the lens is blown away, the air containing dust is backflowed to the air flow curtain, the lens is blown away again after purification, the frequency of personnel climbing for cleaning is reduced, the risk of personnel climbing for cleaning is reduced, the dust removal filter element and the water tank are combined, the backflowing air is double purified, the cleaning effect on the lens is effectively improved, the dust removal filter element is placed in the water tank to be wet, the manual cleaning process of the lens is realized, personnel do not need to carry cleaning tools when cleaning the lens, and the inconvenience and danger of personnel climbing are reduced.

The utility model relates to a single LCD (liquid crystal display) projection short-focus lens which is formed by combining four different spherical lenses. The single LCD projection short-focus lens is structurally formed by fixing a convex-concave spherical lens with positive diopter, a biconcave spherical lens with negative diopter, a concave-convex spherical lens with positive diopter and a biconvex spherical lens with positive diopter through plastic fasteners. When in use, a liquid crystal display panel and a Fresnel lens with a gradually varied focal length are needed, and the Fresnel lens is placed between the liquid crystal display panel and the combination of the four spherical lenses. Through the cooperation of the above components, the transfer function of the lens is greater than 50% at 11lp / mm, the distortion is less than 0.3%, and the lens is suitable for a high-definition (1920 * 1080 resolution) single-chip 5-inch LCD projector. The focal length is 148mm, the F / # is 3.0, and the projection ratio is 1.3.

The utility model provides a single LCD projector, the single LCD projector comprises a light source, an imaging assembly, an LCD screen and a lens assembly, light emitted by the light source passes through the imaging assembly, the LCD screen and the lens assembly in sequence; the imaging assembly comprises a light uniformizing rod, a first condensing lens, a second condensing lens and a Fresnel lens, light emitted by the light source is diffused when passing through the light uniformizing rod, and then the light passes through the first condensing lens, the second condensing lens and the Fresnel lens in sequence to be imaged to the LCD screen. The projector system is provided with the imaging assembly comprising the dodging rod, the first condensing lens, the second condensing lens and the Fresnel lens, and compared with a traditional non-imaging illumination mode, the illumination uniformity and the color uniformity of the projector system are obviously improved, so that the light source of the projector can adopt an RGB-COB light source, and the color gamut is higher.

The invention discloses a full-plasticized single LCD projection lens, and belongs to the technical field of projection lenses, the full-plasticized single LCD projection lens comprises a negative lens group, a diaphragm, a positive lens group and a Fresnel lens which are sequentially arranged from an object plane to an image plane along an optical axis, and the focal length fA of the negative lens group and the focal length fC of the positive lens group meet the following condition:-3.4 < fA / fC <-3.3. The full-plasticized single-LCD projection lens is excellent in performance, small and light in size, high in resolution ratio, large in relative aperture, low in cost, particularly suitable for a portable single-LCD projector, and capable of guaranteeing that the thermal defocusing phenomenon does not occur when the projection lens works at different environment temperatures from the low temperature of-20 DEG C to the high temperature of 65 DEG C. In addition, the three plastic aspheric lenses are used, so that the cost is reduced, the high resolution is ensured, and meanwhile, high-performance technical indexes such as large relative aperture are realized.

The application discloses a kind of LCD projector lens shift device, including LCD light valve, bottom shell, cover plate, projection lens, vertical displacement component, horizontal displacement component and operating component;The LCD light valve, bottom shell and cover plate are sequentially arranged according to the direction of light travel;The LCD light valve is located on the incident side of the bottom shell and is assembled into an integral whole with the bottom shell;The optical axis of the projection lens and the plane where the display window of the LCD light valve is located are orthogonal;The middle of the cover plate and the bottom shell is hollow structure and is used to pass through the projection lens.The application realizes the mechanical shift of the projection lens, and does not produce loss and influence on the definition of image as electronic trapezoidal correction method, and the application has low manufacturing cost, high cost performance, and is especially suitable for large quantity and wide range, cost-sensitive projector products, and is suitable for single LCD, 2LCD and 3LCD projection technology.

The present invention discloses an LCD projector with active color separation illumination, characterized in that it includes a projection light source, a condenser, a collimating lens, an incident polarizer, a dichroic mirror, an LCD light valve, a color combining mirror, an exit polarizer, a field lens, and a projection lens arranged in sequence along the light traveling direction; in the present invention, the RGB three primary color lights of the projection light source are respectively irradiated on the RR, GR, and BR of the LCD light valve, so that ≥2 / 3 of the light originally blocked by the CF corresponding part and the light blocked by the BM corresponding part can pass through the R, G, and B sub-pixels as much as possible or even completely, fundamentally improving the transmittance of the LCD light valve. The present invention improves the total efficiency of the CF and BM of the LCD light valve from 12% - 21% to over 60% - 80%, and the efficiency of the TFT from 40% - 70% to over 60% - 80%, thereby realizing a revolutionary improvement in the efficiency of the optical system, a revolutionary reduction in the heat absorption of the LCD light valve, further achieving a magnitude increase in the output brightness, a huge reduction in the energy consumption of the projector, and also fundamentally helping to improve the color gamut range and white balance of the projected image.

The utility model relates to a closed optical machine with a 3D uniform temperature plate. The closed optical machine comprises a housing, an optical device, an internal circulation fan, a heat radiation module and a heat radiation fan. An internal circulation air duct is formed in the shell, the optical device and the internal circulation fan are both arranged in the internal circulation air duct, the optical device comprises an LCD screen, the heat dissipation module comprises a 3D uniform temperature plate, first heat dissipation fins and second heat dissipation fins, the 3D uniform temperature plate comprises a uniform temperature plate body, a first heat pipe and a second heat pipe, and the first heat pipe and the second heat pipe are connected to the two opposite sides of the uniform temperature plate body. The interiors of the first heat pipe and the second heat pipe are communicated with the uniform temperature plate body, the first heat pipe is sleeved with the first heat dissipation fins which are located in the inner circulation air channel, and the second heat pipe is sleeved with the second heat dissipation fins which are located outside the shell. The structure of the 3D uniform-temperature plate is improved, the 3D uniform-temperature plate comprises the uniform-temperature plate body, the first heat pipe and the second heat pipe, the first heat pipe and the second heat pipe are connected to the two sides of the uniform-temperature plate body, and the first heat pipe and the second heat pipe are both sleeved with the heat dissipation fins, so that a super-efficient heat dissipation module can be formed.

Disclosed is a single LCD projector structure switchable between ultra-short distance projection and medium-long distance projection including a projection module. The projection module includes an LED light source, a condenser cup, a collimating Fresnel lens, an LCD light valve and a focusing Fresnel lens arranged in sequence. The single LCD projector structure further includes a first total reflection mirror and an objective lens module including an objective lens ring and a telescopic mechanism for stretching and retracting of the objective lens ring. A single LCD projector is also provided. The objective lens is shared by ultra-short distance projection and the medium-long distance projection without changing its optical characteristics, thus the objective lens group can move rapidly in a large range and fine focusing is performed in the far end ring or the near end ring, which improves the flexibility and practicability of projection and is suitable for various application scenes.

The present invention discloses a heat dissipation device for an LCD projector, and the LCD projector has a fully sealed optical engine. The heat dissipation device includes an LED light source radiator, a high-efficiency heat exchanger, an external fan, and a wind guide cover. A window for installing the high-efficiency heat exchanger is opened at the bottom of the housing of the fully sealed optical engine; the high-efficiency heat exchanger includes a buckle fin on the high-temperature heat absorption side, a partition plate, and a sunflower profile on the low-temperature heat dissipation side, and the buckle fin, the partition plate, and the sunflower profile are sequentially attached to each other. The buckle fin is located on the internal heat dissipation air duct of the fully sealed optical engine, and the partition plate seals the window opened at the bottom of the housing of the fully sealed optical engine for installing the high-efficiency heat exchanger. The present invention enables the high-efficiency heat exchanger to have indexes close to those of an ideal heat exchanger, the heat dissipation effect of the LCD light valve is better, and the product noise is lower, thereby allowing the projector to output higher brightness and obtain better durability, achieving positive effects.

The present invention provides a novel field-sequential single-LCD projector, which includes an LED light source, a light collection and collimation device, a light combining and color filtering device, an intermediate reflector, a focusing device, a light homogenization device, an exit lens group, an LCD light valve and a field lens, an imaging reflector and a projection lens, which are sequentially arranged in the light traveling direction. The LED light source includes a red light source, a green light source and a blue light source. Compared with the existing full-color light valve technology, under the same technical conditions, the efficiency of the light valve of the present invention is greatly improved, the power of the light source is greatly reduced, and the image color gamut is greatly improved, so that the projector can output higher brightness and has a broader market adaptability. At the same time, compared with the practical LCD light valve technology of pure field-sequential, the present invention can significantly reduce the bandwidth requirement for the driving IC and the response time of the liquid crystal, significantly reducing the engineering difficulty and R & D investment of productization and significantly reducing the raw material cost of the product.

The invention discloses a closed compact straight tube LCD liquid crystal projector which is characterized in that the projector comprises an optical machine cavity shell, an imaging assembly, a lens assembly and a first radiator, the lens assembly is arranged at the outermost end of the optical machine cavity shell, and the imaging assembly is located in the optical machine cavity shell; the optical machine cavity shell is further provided with an internal circulation airflow cover used for containing an internal circulation fan in an integrated forming mode or an externally-arranged mode, and heat between the imaging assemblies can be forcibly and internally circulated towards blade gaps on one side in the cavity shell through the first radiator through the internal circulation fan. The optical machine cavity shell is further provided with an outer circulation air flow channel in the mode that an outer circulation air channel assembly is integrally formed and / or externally arranged, and an outer circulation fan is arranged in the outer circulation air flow channel. And external fresh air flow can be discharged through the external circulating air flow channel after being forced to pass through the blade gaps on one side, facing the outside of the cavity shell, of the first radiator through the external circulating fan. The heat dissipation device has an excellent internal and external double-circulation heat dissipation effect, and is compact in structure and low in cost.

This invention provides an internal circulation heat dissipation structure for a sealed LCD optical system and an LCD projector, belonging to the field of heat dissipation technology. It includes: a main body, a chip disposed inside the main body, a wind guide plate and heat dissipation mechanism I, a heat dissipation mechanism II disposed on a first side of the main body, and a heat dissipation mechanism III disposed on a second side of the main body. The first and second sides are opposite each other, and the wind guide plate is located below the chip, forming a wind channel between them. Heat dissipation mechanism I includes a wind guide bracket, an internal circulation heat dissipation fan, and a fan pressure plate. The internal circulation heat dissipation fan is fixed to the fan pressure plate and disposed inside the wind guide bracket. The upper edge of the wind guide bracket bends and extends to the side of the chip, forming an air outlet channel between the upper edge of the wind guide bracket and the upper edge of the fan pressure plate, and the air outlet channel communicates with the wind guide channel. This internal circulation heat dissipation structure of the present invention, while preventing dust, makes chip heat dissipation more uniform and improves the heat dissipation effect.