CN218103316U

CN218103316U - Single-chip LCD projection equipment

Info

Publication number: CN218103316U
Application number: CN202222577588.XU
Authority: CN
Inventors: 田海军
Original assignee: Sichuan Changhong Electric Co Ltd
Current assignee: Sichuan Changhong Electric Co Ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2022-12-20
Anticipated expiration: 2032-09-28

Abstract

The utility model discloses a single-chip LCD projection device, which comprises a projection lens, a rear Fresnel lens, an LCD screen, a front Fresnel lens, a reflective cup and an LED light source, wherein the rear Fresnel lens, the LCD screen, the front Fresnel lens, the reflective cup and the LED light source are sequentially arranged from top to bottom; a sealing cavity is formed between the front Fresnel mirror and the LCD screen, a refrigerant is filled in the sealing cavity, a fan is arranged on the left side or the right side of the sealing cavity, and the LCD screen is cooled through the fan and the refrigerant. The utility model discloses a form confined seal chamber between LCD screen and preceding fresnel mirror to add the refrigerant, combine LCD screen and refrigerant, carry out high efficiency, even heat dissipation to the LCD screen, improve the radiating efficiency of LCD screen.

Description

Single-chip LCD projection equipment

Technical Field

The utility model relates to a projection equipment technical field specifically is a monolithic LCD projection equipment.

Background

Single-chip LCD projection products, because the LCD screen transmission is very low (around 5%), the vast majority of the energy of the illumination light is concentrated inside the light engine to form heat, and is mainly distributed over the LCD screen. This heat is difficult to the high-efficient transfer to the ray apparatus outside, in order to maintain the inside especially thermal operation reliability of LCD screen of ray apparatus, the method that adopts at present is mostly: by using the die-casting radiator and the turbofan, cold air is changed into hot air after passing through the turbofan and the LCD screen, then flows through the fins of the die-casting radiator, is changed into cold air after being transmitted to the outside through the fins of the radiator, and then enters the turbofan to form a circulating air duct. However, the single-chip LCD projection product set by the method has a complex structure and is extremely inconvenient to install; the radiating efficiency is low, the LCD screen can not reach even heat dissipation, and the radiating efficiency is low excessively and can bring the risk of burning the screen.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a monolithic LCD projection equipment to in the monolithic LCD projection ray apparatus that provides in solving the background art, the radiating efficiency is low, and the LCD screen can't reach even heat dissipation, and radiating efficiency crosses low technical problem who can bring the risk of burning screen.

In order to achieve the above object, the utility model provides a following technical scheme:

a single-chip LCD projection device comprises a projection lens, a rear Fresnel lens, an LCD screen, a front Fresnel lens, a reflective cup and an LED light source which are sequentially arranged from top to bottom, wherein light emitted by the LED light source is condensed by the reflective cup, is modulated into parallel light by the front Fresnel lens, is displayed by the LCD screen, is shaped by the rear Fresnel lens and is projected and imaged by the projection lens; a sealing cavity is formed between the front Fresnel mirror and the LCD screen, a refrigerant is filled in the sealing cavity, a fan is arranged on the left side or the right side of the sealing cavity, and the LCD screen is cooled through the fan and the refrigerant.

The further technical scheme is as follows: the LED light source is provided with a radiator, and the radiator is connected with a thermistor for protecting the LED light source.

The further technical scheme is as follows: the temperature of the thermistor is set to 90-100 ℃.

The further technical scheme is as follows: the radiator is arranged on the lower side of the LED light source.

The further technical scheme is as follows:

and a reflector is arranged between the projection lens and the rear Fresnel mirror, and the upper end of the reflector inclines towards the projection lens so as to refract light rays from the rear Fresnel mirror to the projection lens and transmit the light rays for imaging through the projection lens.

The further technical scheme is as follows: the light reflectivity of the reflecting cup is more than or equal to 95 percent.

The further technical scheme is as follows: the light transmittance of the rear Fresnel mirror is more than or equal to 90 percent; the light transmittance of the front Fresnel mirror is more than or equal to 90%.

The further technical scheme is as follows: the light transmittance of the LCD screen is 4.5-5.5%.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses, form confined seal chamber between LCD screen and preceding fresnel mirror to add the refrigerant, combine LCD screen and refrigerant, can carry out high efficiency, even heat dissipation to the LCD screen, make the heat-sinking capability of LCD screen obtain promoting. Meanwhile, according to the design requirement of an optical system, a refrigerant with better light transmittance is selected, so that the effect of a liquid lens can be realized, the performance indexes of light transmission efficiency and brightness uniformity are improved, and higher brightness can be output for the projector.

Drawings

Fig. 1 is a schematic structural diagram of a single-chip LCD projection device according to an embodiment of the present invention;

fig. 2 is the structure diagram of the front fresnel mirror and the LCD screen of the embodiment of the present invention.

Reference numerals are as follows:

1-a radiator; 2, a fan; 3-LCD screen; 4-an LED light source; 5-a light reflecting cup; 6-front Fresnel mirror; 7-rear Fresnel mirror; 8-a mirror; 9-a projection lens; 10-a thermistor; 11-a refrigerant; 12-polarized thermal insulation sheet.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Examples

The invention discloses a single-chip LCD projection device which is shown by combining an attached figure 1-2 and comprises a projection lens 9, a rear Fresnel lens 7, an LCD screen 3, a front Fresnel lens 6, a reflective cup 5 and an LED light source 4 which are sequentially arranged from top to bottom, wherein light emitted by the LED light source is condensed by the reflective cup, is modulated into parallel light by the front Fresnel lens, is displayed by the LCD screen, and is shaped by the rear Fresnel lens and then is projected and imaged by the projection lens; a sealed cavity is formed between the front Fresnel mirror and the LCD screen, and a refrigerant is filled in the sealed cavity, so that heat transfer is realized by utilizing the characteristic that the refrigerant is easy to absorb heat and change into gas and is easy to release heat and change into liquid, and the LCD screen is cooled; and the fan is arranged on the left side or the right side of the seal cavity, and the LCD screen is cooled through the fan and the refrigerant. Further, the LED light source 4 is also provided with a radiator 1, a thermistor for protecting the LED light source is connected with the radiator, and the temperature of the thermistor is set to be 90-100 ℃. And a reflector is arranged between the projection lens and the rear Fresnel mirror, and the upper end of the reflector inclines towards the projection lens so as to refract light rays from the rear Fresnel mirror to the projection lens and transmit the light rays for imaging through the projection lens.

Specifically, a radiator 1 is arranged on the lower side of the light source 4, a thermistor 10 is arranged on the radiator 1, heat generated by light emission of the LED light source is led out through the radiator 1, is radiated through a fan 2 and is protected through the thermistor 10; the lower end of a reflecting cup is arranged on the light source 4, the upper end of the reflecting cup 5 is connected with the lower side of the front Fresnel mirror 6, the LCD screen 3 is arranged on the upper side of the front Fresnel mirror, a sealed cavity is arranged between the front Fresnel mirror and the LCD screen, and a refrigerant is filled in the cavity; the LCD screen upside is equipped with back fresnel mirror 7, and the slope of back fresnel mirror 7 upside is provided with speculum 8, and the speculum front side is equipped with projection lens 9 to the projection lens of light refraction to the front side through back fresnel mirror 7, thereby pass through projection lens transmission imaging.

As a possible implementation, a polarized heat insulation sheet 12 is disposed in the middle of the lower side of the LCD screen to further improve the heat dissipation effect.

The specific working principle is as follows:

when the single-chip LCD projection equipment works, the LED light source 4 emits light, the LED light source 4 leads out heat through the radiator 1, the heat is dissipated through the fan 2, the LED light source 4 can be protected through the thermistor 10, the temperature of the thermistor is set to be 90-100 ℃, preferably, the protection temperature of the single-chip LCD projection equipment is set to be 80 ℃, the protection temperature can be adjusted according to the technical state of an actual product, and the protection temperature is exceeded, so that the thermistor 10 can play a protection role. The LED light source 4 emits light, light is condensed by the light reflecting cup 5, the light reflectivity of the light reflecting cup 5 is larger than or equal to 95%, the condensed light passes through the front Fresnel mirror 6, the light transmissivity of the front Fresnel mirror 6 is larger than or equal to 90%, the scattered light is modulated into parallel light, the parallel light passes through the LCD screen 3, an optical-grade refrigerant 11 is arranged in a sealing cavity between the front Fresnel mirror 6 and the LCD screen 3, after an image is displayed on the LCD screen 3, the image passes through the rear Fresnel mirror shaping 7, the light transmissivity of the rear Fresnel mirror 7 is larger than or equal to 90%, the light path needs to be turned by the reflection of the reflector 8 to reduce the volume, finally, the image is projected by the projection lens 9, and the finally processed image can reach higher brightness.

The transmittance of the LCD panel 3 is about 5%, preferably, the LCD panel with a transmittance of 4.5-5.5% is selected in this embodiment, and certainly, with the technological progress, the LCD panel with a higher transmittance can be selected, and most of the energy of the illumination light is collected inside the projection apparatus to form heat energy, and is mainly distributed on the LCD panel 3. This heat is difficult to efficiently transfer to the exterior of the projection device. The utility model discloses a monolithic LCD projection equipment has add seal chamber on improving the basis of traditional airtight projection equipment inside and outside heat exchange to add the refrigerant, combine LCD screen and optics level refrigerant, can carry out high efficiency, even heat dissipation with the LCD screen, make the heat-sinking capability of LCD screen promote several times, effectively guarantee the normal operating temperature of LCD screen. Simultaneously, also according to optical system design demand, the refrigerant that can select to use stably and have characteristic optics refracting index is as preferred, the utility model discloses a refrigerant luminousness is greater than or equal to 80%, realizes liquid lens's efficiency, promotes the performance index of light transmission efficiency and luminance homogeneity, for the exportable higher luminance of monolithic LCD projection equipment.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A single-chip LCD projection device is characterized by comprising a projection lens, a rear Fresnel lens, an LCD screen, a front Fresnel lens, a reflecting cup and an LED light source which are sequentially arranged from top to bottom, wherein light emitted by the LED light source is condensed by the reflecting cup, then is modulated into parallel light through the front Fresnel lens, is displayed through the LCD screen, is shaped by the rear Fresnel lens and is projected and imaged through the projection lens; a sealing cavity is formed between the front Fresnel mirror and the LCD screen, a refrigerant is filled in the sealing cavity, a fan is arranged on the left side or the right side of the sealing cavity, and the LCD screen is cooled through the fan and the refrigerant.

2. The single-chip LCD projection device of claim 1, wherein a heat sink is disposed on the LED light source, and a thermistor is connected to the heat sink for protecting the LED light source.

3. A single-chip LCD projector device as claimed in claim 2, wherein the temperature of said thermistor is set to 90-100 ℃.

4. The single-chip LCD projection device of claim 2, wherein the heat sink is disposed under the LED light source.

5. The single-chip LCD projection device of claim 1, wherein a reflector is disposed between the projection lens and the rear Fresnel mirror, and an upper end of the reflector is tilted toward the projection lens to refract light from the rear Fresnel mirror to the projection lens for transmission imaging through the projection lens.

6. A single-chip LCD projection device as claimed in any one of claims 1 to 5, wherein the light reflectivity of the reflective cup is 95% or more.

7. A single-chip LCD projection device according to any of claims 1-5, wherein the rear Fresnel mirror has a light transmission of 90% or more; the light transmittance of the front Fresnel mirror is more than or equal to 90%.

8. A monolithic LCD projection device as claimed in any one of claims 1 to 5, wherein the LCD screen has a light transmission of 4.5 to 5.5%.