17 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 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 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 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 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.

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 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 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 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.

The present application provides a kind of phase difference sheet and liquid crystal projector, the phase difference sheet is equipped with substrate and as inclined film phase difference film, in the plane of the substrate and the film forming surface formed with the phase difference film parallel, the axis of the phase difference generated by the incident light for the incidence angle of +15 ° relative to the normal is +45 ° when the orientation of the slow axis when the substrate is rotated about the normal is azimuth of the substrate, the azimuth of the reference azimuth is 0 ° to 360 °, the phase difference generated by the incident light for the incidence angle of +15 ° relative to the normal is +45 ° when the orientation of the slow axis when the substrate is rotated about the normal is azimuth of the substrate, the absolute value of the difference between the first phase difference of the incident light when the azimuth is +45 ° relative to the reference azimuth and the second phase difference of the incident light when the azimuth is-45 ° relative to the reference azimuth is 6 nm or less.

This invention discloses a single-panel LCD projector, comprising: a housing, an optical engine assembly, and a heat dissipation assembly; the housing has an air inlet and an air outlet; the optical engine assembly is disposed within the housing, and includes a housing and a heat exchanger, the housing having an inner cavity and a mounting port communicating with the inner cavity; the heat exchanger includes a heat exchange substrate and a plurality of heat exchange fins disposed on the heat exchange substrate; the heat exchange substrate is disposed at the mounting port, and the heat exchange fins are disposed in the inner cavity; the heat dissipation assembly is disposed within the housing, and the heat dissipation assembly is detachably connected to the side of the heat exchange substrate away from the heat exchange fins, and at least partially corresponds to the air inlet or air outlet. The technical solution of this invention improves the structural flexibility of the single-panel LCD projector by placing the heat exchanger on the housing and detachably connecting the heat dissipation assembly to the heat exchanger. The shape and size of the heat exchanger can be designed according to the structure of the housing and the internal components of the housing. The heat dissipation assembly and the air inlet or air outlet on the housing can be flexibly arranged according to the space inside the housing.

The utility model relates to a closed light machine and LCD projector of double fan circulation heat dissipation, including: light machine shell, internal circulation fan set, heat dissipation module and external circulation fan, light machine shell includes top shell, middle shell and bottom shell that connect in proper order from top to bottom, top shell and middle shell together enclose a first accommodation cavity, and the bottom shell is equipped with the bottom shell, the first accommodation cavity is equipped with the internal circulation fan set, the heat dissipation module is equipped with the external circulation fan set, and the external circulation fan set is equipped with the external circulation fan set. The bottom shell and the middle shell jointly define a second containing cavity, a first ventilation opening and a second ventilation opening are formed in the bottom of the middle shell, and a partition piece and an imaging module are arranged in the first containing cavity. According to the invention, through the position design of the heat dissipation channel, the fans and the radiator and the mutual cooperation, the heat dissipation of the closed light machine is completed, the heat dissipation efficiency of the projector is improved, the overall power consumption and the size of the projector are reduced, and the projector can be ensured to operate safely and stably; the sealing performance of the optical machine, the high efficiency of heat dissipation, the compactness of the structure, and the safety and stability can be considered.

The utility model relates to a lens and a single-chip LCD projector. The lens comprises a first lens, a second lens and a third lens which are sequentially and coaxially arranged in the opposite direction of emergent light of the lens. The first lens is a convex lens, the second lens is a concave lens, and the third lens is a convex lens; the refractive index of the first lens ranges from 1.75 to 1.80, the refractive index of the second lens ranges from 1.60 to 1.70, and the refractive index of the third lens ranges from 1.60 to 1.70; the dispersion coefficient of the first lens is Vd1, 45 < = Vd1 < = 55, the dispersion coefficient of the second lens is Vd2, 28 < = Vd1 < = 35, the dispersion coefficient of the third lens is Vd3, 50 < = Vd3 < = 60. By selecting the refractive indexes of the first lens, the second lens and the third lens and the dispersion system, the imaging definition of the lens is obviously improved after light enters the lens, so that the imaging definition is improved, the actual imaging effect of the lens is improved, and the watching and using experience of a user is improved.