CN201689268U - Micro projector structure - Google Patents

Abstract

The utility model discloses a micro projector structure, in particular to an improved structure applied to a micro projector; the structure of the utility model is composed of a light emitting diode, a collimator, a lens array, a light source magnifier, a reflector, a polarization spectroscope, a reflective liquid crystal panel and a lens image module, wherein the light emitting diode contains red, green and blue light emitting diodes; the collimator converts a light source emitted by the light emitting diode into parallel light; the lens array homogenizes the parallel light source; the light source magnifier magnifies the light source of the lens array to a proper magnification onto the reflective liquid crystal panel; the reflector folds the light path of the light source; the polarization beam splitter transmits the horizontal polarized light and reflects the vertical polarized light; the reflective liquid crystal panel reflects the light source and modulates an optical signal to be projected to a screen; the projection lens module is in a positive, negative, positive and positive mirror mode in sequence to image the image of the reflective liquid crystal panel on the screen.

Description

micro projector structure

technical field

The utility model relates to a projector, in particular to a micro projector structure.

Background technique

The light source processing system of commonly used projectors, whether it is the 3-chip flat liquid crystal display device (3LCD) of the Japanese company Epson (EPSON) or the digital light source processing display device (Digital Light Processing-DLP) or the reflective liquid crystal display device (Liquid Crystal on Silicon-LCoS) of 3M Company of the United States, etc., all use high-temperature or high-pressure halogen lamps, xenon lamps or mercury lamps without environmental protection concepts as white light sources. Color mirrors, panels, or color wheels first separate white light into three primary colors of red, green, and blue, and then project images of each color onto the screen after synthesis. Therefore, the necessary optical devices required for each step of processing occupy the projector The size is so large that it cannot be used on personal, miniaturized, portable and plug-and-play media devices in line with the current technological trend.

Such as the light source processing system mentioned above, in addition to being limited by the heat dissipation device required by the traditional light bulb due to high heat and the noise of its fan, the service life of the light bulb is also extremely short and needs to be replaced frequently, causing many inconveniences, which are also incompatible with technology. Development trend and need to improve urgently.

Utility model content

The technical problem solved by the utility model is to provide a micro-projector structure, which is not limited by the heat dissipation device for heat dissipation of the light bulb and has a small volume.

The technical solution of the utility model is:

A miniature projector structure, which is composed of a light emitting diode, a collimator, a lens array, a light source magnifying glass, a polarized beam splitter, a reflective liquid crystal panel and a lens image module, wherein:

The light-emitting diode is a light-emitting diode including three colors of red, green and blue;

The light source emitted by the light-emitting diode of the collimator is converted into a parallel light source after passing through the collimator;

The lens array homogenizes the parallel light source;

The light source magnifying glass magnifies the light source of the lens array on the reflective liquid crystal panel;

The polarized beam splitter allows horizontally polarized light to pass through and vertically polarized light to reflect;

The reflective liquid crystal panel reflects the light source and modulates the light signal projected to the screen;

The projection lens module forms the image of the reflective liquid crystal panel on the screen in order of positive, positive, negative, positive, and positive mirror modes.

In the micro-projector structure described above, the light-emitting diode as the light source is a single light-emitting diode that combines light paths of red, green and blue light sources.

The micro-projector structure above, wherein the light source magnifying glass includes a front light source magnifying glass and a rear light source magnifying glass, and among the two positive light source magnifying lens elements of the front light source magnifying glass and the rear light source magnifying glass, the focal length of the former positive light source magnifying lens element is Greater than the focal length of the latter positive light source magnifying lens element.

In the micro-projector structure described above, the focal length of each lens in the lens array is limited within 3 mm to 4.5 mm.

In the micro-projector structure described above, a reflective mirror for folding the light path is arranged behind the magnifying mirror of the light source.

In the micro-projector structure described above, the reflection mirror has a reflection angle of 45 degrees.

A micro-projector structure of the utility model is composed of a light emitting diode, a collimator, a lens array, a light source magnifying glass, a reflector, a polarized beam splitter, a reflective liquid crystal panel and a lens image module, wherein the light emitting diode is Contains red, green, and blue light-emitting diodes.

A micro-projector structure such as the utility model is composed of a light emitting diode, a collimator, a lens array, a light source magnifying glass, a reflector, a polarized beam splitter, a reflective liquid crystal panel and a lens image module, wherein the collimator The device converts the light source emitted by the light-emitting diode into parallel light.

A micro-projector structure such as the utility model is composed of a light emitting diode, a collimator, a lens array, a light source magnifying glass, a reflector, a polarized beam splitter, a reflective liquid crystal panel and a lens image module, wherein the lens array Homogenizes parallel light sources.

A micro-projector structure such as the utility model is composed of a light emitting diode, a collimator, a lens array, a light source magnifying glass, a reflector, a polarized beam splitter, a reflective liquid crystal panel and a lens image module, wherein the light source magnifying glass Magnify the light source passing through the lens array on the reflective liquid crystal panel with an appropriate magnification.

Such as a kind of micro-projector structure of the present utility model, is made up of light-emitting diode, collimator, lens array, light source magnifying glass, reflecting mirror, polarizing beam splitter, reflective liquid crystal panel and lens image module, wherein reflecting mirror Folds the light path of the light source.

A micro-projector structure such as the utility model is composed of a light-emitting diode, a collimator, a lens array, a light source magnifying glass, a reflector, a polarized beam splitter, a reflective liquid crystal panel and a lens image module, wherein the polarized Beamsplitters transmit horizontally polarized light and reflect vertically polarized light.

A micro-projector structure such as the utility model is composed of a light emitting diode, a collimator, a lens array, a light source magnifying glass, a reflector, a polarized beam splitter, a reflective liquid crystal panel and a lens image module, wherein the reflective The liquid crystal panel reflects the light source and modulates the light signal to be projected onto the screen.

Such as a micro-projector structure of the present utility model, it is composed of a light emitting diode, a collimator, a lens array, a light source magnifying glass, a reflector, a polarized beam splitter, a reflective liquid crystal panel and a lens image module, wherein the projection lens The modules are sequentially configured as positive, positive, negative, positive, and positive mirror modes to image the image of the reflective liquid crystal panel on the screen.

Known from the above description, the utility model compared with the prior art can indeed achieve the following effects:

The miniature projector structure of the utility model directly adopts light-emitting semiconductor light sources (Light Emitting Diode-LEDs) of red, green and blue primary colors. In addition to simplifying the volume occupied by the light source processing system, it can quickly switch and project without requiring The cooling fan is noiseless, and the service life of the light bulb can be as long as 20,000 hours, coupled with the special function of using a reflective liquid crystal display (LCoS) with a high aperture ratio (High Open Ration), and its wiring and The switching elements are all arranged under the reflective layer without the black matrix (BlackMatrix) part, so that the projection can display a seamless image, and there is no screen door effect, so that the picture looks clear and bright.

The miniature projector structure of the utility model will not be limited by the cooling device required by the heat dissipation of the bulb, and the light-emitting diode is used as the light source, so that the service life of the light source is greatly extended; in addition, the miniature projector structure of the utility model can be made into a palm-type The type of the body is powered by the Universal Serial Bus (USB) and transmits the image signal from the personal computer; or it can be directly embedded in the media equipment, such as mobile phones, digital cameras, notebook computers, etc. to become different application example.

Description of drawings

Fig. 1 is a schematic diagram of component assembly of the present invention.

Explanation of main component labels:

The utility model:

10: Micro projector 11: LED 12: Front collimator

13: Rear collimator 14: Lens array 15: Front light source magnifying glass

16: Reflector 17: Rear light source magnifying glass 18: Polarization beam splitter

19: Reflective LCD panel 20: Light source light path 30: Projection light path

50: Projection lens module 51: First positive mirror 52: Second positive mirror

53: The first negative mirror surface 54: The third positive mirror surface 55: The fourth positive mirror surface

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation of the utility model is now described with reference to the accompanying drawings.

Please refer to FIG. 1 for a schematic diagram of the combination of elements of the micro projector structure of the present invention, wherein the structure of the micro projector (Pico) 10 of the present utility model is firstly composed of one with red, green and blue primary colors (R, green and blue) according to its light source optical path 20. G, B) a single light emitting diode (LED) 11 as a light source, through the two positive lens elements of the front collimator (Collimator) 12 and the rear collimator 13, the divergent light emitting diode 11 light source is converted into collimated Parallel light passes through the lens array (Lens Array) 14 subsequently, to homogenize its parallel light source, but the focal length of each lens in the lens array 14 is limited to just have better effect in 3mm～4.5mm; Then, the front light source magnifying glass 15. Magnify the light source of the lens array 14 onto the reflector (Mirror) 16 with a reflection angle of 45 degrees, so that the originally horizontal light source light path 20 is folded vertically at 90 degrees and reflected to the rear light source magnifying glass 17, and continues to be the second with an appropriate magnification. Secondary magnification, but the two positive lens elements of the front light source magnifier 15 and the rear light source magnifier 17, wherein the focal length of the former must be greater than the focal length of the latter, and then pass through the polarizing beam splitter (Polarizing Beam Splitter-PBS) 18, with all Reflected to the reflective liquid crystal panel (LCoS Panel) 19, the process of advancing the light source light path 20 in the previous stage is completed.

Please continue to refer to Fig. 1, wherein the micro-projector 10 of the utility model can reflect vertically polarized light and allow horizontally polarized light to penetrate through the polarized beam splitter 18, so that the reflective liquid crystal panel 19 will project the light source into horizontal reflection And modulate the optical signal to be projected to the screen, and then pass through the polarizing beam splitter 18 to form a projection optical path 30, which passes through the first positive mirror 51, the second positive mirror 52, and the second positive mirror 52 of the projection lens module 50 in sequence. A negative mirror 53 , a third positive mirror 54 , and a fourth positive mirror 55 are arranged in a mirror pattern for processing, and finally the image of the reflective liquid crystal panel 19 is imaged on the projected screen.

The above-mentioned reflective liquid crystal panel 19 is the image supply source, and the polarized beam splitter 18 is only used for light splitting and has no direct relationship with projection imaging. The projection lens module 50 focuses the image projection of the reflective liquid crystal panel 19 on the screen.

The structure of the miniature projector of the present invention can be independently made into a palm-type body, and can be powered by a universal serial bus (USB) and transmit image signals from a personal computer; or it can be directly embedded in a media device In different applications, such as mobile phones, digital cameras, notebook computers, etc.

The above descriptions are only illustrative specific implementations of the present utility model, and are not intended to limit the scope of the present utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention shall fall within the protection scope of the present invention.

Claims (6)

1. A micro-projector structure, which is composed of light emitting diode, collimator, lens array, light source magnifier, polarized beam splitter, reflective liquid crystal panel and lens image module, is characterized in that: The light-emitting diode is a light-emitting diode including three colors of red, green and blue; The light source emitted by the light-emitting diode of the collimator is converted into a parallel light source after passing through the collimator; The lens array homogenizes the parallel light source; The light source magnifying glass magnifies the light source of the lens array on the reflective liquid crystal panel; The polarized beam splitter allows horizontally polarized light to pass through and vertically polarized light to reflect; The reflective liquid crystal panel reflects the light source and modulates the light signal projected to the screen; The projection lens module forms the image of the reflective liquid crystal panel on the screen in order of positive, positive, negative, positive, and positive mirror modes. 2. The micro-projector structure according to claim 1, wherein the light-emitting diode as the light source is a single light-emitting diode that combines light paths of red, green and blue light sources. 3. The micro-projector structure according to claim 1, wherein the light source magnifying glass comprises a front light source magnifying glass and a rear light source magnifying glass, and in the two positive light source magnifying lens elements of the front light source magnifying glass and the rear light source magnifying glass, the front light source magnifying glass The focal length of the magnifying lens element of a positive light source is greater than the focal length of the magnifying lens element of the latter positive light source. 4. The micro-projector structure according to claim 1, characterized in that, the focal length of each lens in the lens array is limited within 3mm˜4.5mm. 5. The micro-projector structure according to claim 1, characterized in that, behind the magnifying mirror of the light source, there is a mirror for folding the light path. 6. The micro-projector structure according to claim 5, wherein the reflection mirror has a reflection angle of 45 degrees.

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