TW201925901A - Projector structure - Google Patents

Abstract

The present invention provides a projector structure which comprising a light source module including at least a first light-emitting diode, a first plastic condenser lens, a second light-emitting diode and a second plastic condenser lens. Wherein the first light emitting diode emits a first light through the first plastic condenser lens and enters the trichroic prism assembly, and the second light emitted by the second light emitting diode enters the trichroic prism assembly through the second plastic condenser lens; and a first filter disposed between the first light-emitting diode and the first plastic condenser lens for filtering the ultraviolet light in the first light before entering the trichroic prism assembly.

Description

Projector structure

The present invention relates to a projector structure; and more particularly to a projector structure that resists luminance degradation.

From laptops to smart phones, portable information processing devices are shrinking in size, and the size of the display is reduced. However, a display that is too small is not suitable for presentation, so using a projector to display a presentation screen is a common solution for such occasions. However, existing projectors are too bulky and too heavy to carry. Therefore, designers have reduced the projector and reduced the weight to form a micro projector, even integrated into smart phones or other portable devices.

The most critical components in a pico projector are the optical engine core and the illumination source. As for the optical engine core, it is mainly divided into two technologies, one is Digital Light Process (DLP), and the other is Liquid Crystal on Silicon (LCoS). At present, both micro-projection technologies use a light-emitting diode (LED) as an illumination source. Among them, if the DLP technology is completed by a single wafer, the color performance of the image cannot compete with the projection technology of the LCoS. However, if the DLP technology is completed by three wafers, although the defect of insufficient color expression on the single-wafer product can be avoided, the cost is high and the volume is not easy to be reduced, so it is difficult to complete in the pico projector. Moreover, due to the limitation of microelectromechanical structure, the aperture ratio and resolution of DLP technology are difficult to improve, which is a great weakness of DLP projection technology.

Therefore, the use of LCoS projection technology to complete the micro projector has gradually become the mainstream, but the LCoS projection technology that uses the liquid crystal and the polar light characteristics to change the light output ratio, inevitably a part of the light will be consumed in the process of processing, resulting in LCoS The luminous efficiency of projection technology is not good, which will be a priority problem in portable devices that focus on energy consumption. In addition, the spectrum of light emitted by green and blue light-emitting diodes (LEDs) usually has ultraviolet (UV) components, which can damage the plastic components in the system, causing the light transmittance of the optical path to decrease with time. The life of the product.

Therefore, the micro-projector using the three primary color light-emitting diodes as a light source has the above-described phenomenon and causes a problem that the luminance is attenuated with the use time. Therefore, how to develop a micro projector with low power consumption and low cost and long service life is the main purpose of developing this case.

The present invention is a projector structure, comprising: a light source module, comprising at least a first light emitting diode, a first plastic collecting lens, a second light emitting diode, and a second plastic collecting lens And a light-emitting aperture, wherein the first light-emitting diode emits one of the first light rays entering the light-collecting cymbal through the first plastic concentrating lens, and the second light-emitting diode emits one of the second light rays The first light filtering device is disposed between the first light emitting diode and the first plastic collecting lens for filtering the first light. The ultraviolet light component enters the combined light ray; a light guiding module is configured to receive the light source module to send light and send out a first polarization type light; a 矽-based liquid crystal module receives the light guide The first polarization type light sent by the lead module is modulated and converted into the second polarization type light carrying the image and then penetrates the light guiding module; and an imaging lens group receives the penetration The second polarization type of light of the light guiding module is focused and imaged.

According to the above projector structure, further comprising a second filter device disposed between the second light emitting diode and the second plastic collecting lens for filtering the ultraviolet light component in the second light Only enter the light.

According to the above projector structure, the light source module includes a first slot and a second slot for respectively movably placing the first filter device and the second filter device, the first filter The optical device and the second filter device are each completed by a glass filter.

According to the above projector structure, the light-incident surface of the glass filter is plated with a filter film layer blocking ultraviolet light, and the light-emitting surface thereof is plated with an anti-reflection layer.

According to the above projector structure, further comprising a first glass collecting lens between the first light emitting diode and the first plastic collecting lens, and the first filtering device is disposed on the first glass The surface of the concentrating lens is configured to filter the ultraviolet light component in the first light before entering the first plastic concentrating lens.

According to the above projector structure, the first filter device is a glass protective cover having ultraviolet light (UV) filtering capability covering the light emitting surface of the first light emitting diode.

According to the above-mentioned structure of the projector, the light source module further comprises an array lens made of plastic for homogenizing the light sent by the combined light to be sent to the light guiding module.

According to the above projector structure, the first slot and the second slot are respectively disposed between the first LED and the first plastic collecting lens and the second LED The second plastic concentrating lens is disposed between the second plastic concentrating lens for providing the first filter device.

The invention can effectively extend the service life of the projector under the condition of setting the micro-variable hardware.

Some exemplary embodiments that may achieve the features and advantages of the present invention are described in detail in the description which follows. It is to be understood that the invention is capable of various modifications in the various embodiments of the invention this invention.

Please refer to FIG. 1 , which is a schematic diagram of an optical path structure of a micro projector according to the present invention. The light source module 10 is configured to emit three primary colors of red, green, and blue (in this example, a three-color light-emitting diode (LED) light source. The non-single polarized light produced, that is, a light source that can emit light of two polarization types, which are mixed with "P-polarized light" and "S-polarized light". The "P-polarized light" and the "S-polarized light" are transmitted through the array lens 11 to homogenize the light and energy, and then sent to a Polarization Conversion System (PCS) 12 for conversion. The light originally mixed with P-polarized light and S-polarized light is converted into a single polarized light (in this case, as an example of conversion to S-polarized light), and then transmitted on a transmission path. The light output from the polarization converter 12 is collected by a Condenser lens 13, and then sent to a Polarization Beam. Splitting Prism (PBS) 14.

However, in order to singulate the polarization of the light, the present invention is provided with a polarizing plate 149 before the incident surface 140 of the polarizing separation crucible 14, and the polarizing plate 149 is completed by a reflective polarizing plate for the first polarization type. The light advances along a first path, and the second polarization type light is advanced toward the reflected second path, and the polarization converter 12, the polarizing plate 149 and the polarization separation 稜鏡14 together form a light guiding module. In this example, the first polarization type light and the second polarization type light are the S-polarized light and the P-polarized light described above. Since the reflective polarizer 149 can reflect the light that is not penetrated to the second path (in this case, the opposite direction) instead of absorbing, the light that fails to penetrate can be redirected to the correct direction through the recycling mechanism. On the path. In this way, the case will be able to effectively improve the luminous efficiency.

In addition, since the reflective polarizer 149 is generally not resistant to high temperatures, in this case, the device is particularly disposed at a position away from a light source that generates high heat (in this case, a three-color light-emitting diode (LED) light source). An example of this is that it is attached to the incident surface 140 of the polarizing separation crucible 14, which not only provides the support strength required for the reflective polarizing plate 149, but also avoids material deterioration or warpage caused by high temperature.

As for the polarization separation 稜鏡 14 for receiving the first polarization type light (in this example, S-polarized light) along the first path (transmitted through the polarizer 149) and guiding to a third path (the figure is reflected to The right side), the 矽-based liquid crystal module 15 including the phase retarder 150 receives the first polarization type light along the third path (in this case, S-polarized light) and is modulated and reflected. The second polarization type light (in this example, P-polarized light) carrying the image is transmitted through the polarization separation 稜鏡 14 and sent to the imaging lens group 16, and the imaging lens group 16 receives the polarization separation 稜鏡. The second polarization type of light (in this case, P-polarized light) is focused and imaged.

Referring to FIG. 2, which is a schematic view of another preferred embodiment of the reflective polarizing plate 149, a polarizing plate module 20 is introduced in place of the reflective polarizing plate 149 of FIG. The polarizing plate module 20 includes a polarizing plate film 200 and a first transparent hard substrate 201 and a second transparent hard substrate 202. The polarizing film 200 is coated by the first transparent hard substrate 201 and the second transparent hard substrate. The substrate 202 is fixed therebetween, and the polarizer module 20 is disposed on the transmission path of the first polarization type light and the second polarization type light to transmit the first polarization type light A path advances and the second polarization type of light is advanced toward the second path. In this example, the first polarization type light and the second polarization type light are the S-polarized light and the P-polarized light described above. Since the reflective polarizer module 20 can reflect the light that is not penetrated to the second path (in this case, the leftward direction in the figure) instead of absorbing, the recycling mechanism of this example can follow the second path. The P-polarized light returned to the polarization converter 12 is transmitted through the optical path design of the polarization converter 12 and the array lens 11 to reconvert the P-polarized light recovered and reflected back to the correct path. Similarly, the polarizer module 20 can also be in close contact with the surface of the polarization converter 12 to shorten the return path of the second polarization type light and increase the light recovery rate.

In detail, as shown in the figure, since the polarization converter 12 mainly includes a plurality of strip-shaped polarization beam splitters (PBS Array) 122, a phase retarder (retarder) 123, and a light-transmitting region 124 between the phase retardation sheets 123. The light-transmitting region 124 and the polarization beam splitter 122 can pass the reflected P-polarized light to the rear array lens 11, and then reflect it by the array lens 11 and other possible reflecting surfaces to pass through the polarization converter. 12 times, and then convert it to S-polarized light. In this way, the reflected P-polarized light can be effectively recycled and converted into S-polarized light, thereby increasing the utilization of the light source. The coating film 110 can be an anti-reflection layer, and the material of the array lens 11 can be completed by using glass. The coating 110 may be provided with a coating on both sides to increase the transmittance and improve the light efficiency.

However, since the light source module 10 is composed of a light-emitting diode (LED) light source of three primary colors of red, green and blue, the spectrum of light emitted by green and blue light-emitting diodes (LEDs) usually has ultraviolet light (UV). The composition of the system will damage the plastic components in the system, causing the light transmittance of the optical path to decrease with time, affecting the service life of the product. In order to improve this problem, the following solutions have been developed.

Referring to FIG. 3 , it is a detailed structural diagram of the light source module 10 of the present invention, which includes a first light emitting diode 31 for emitting light containing ultraviolet (UV) components, which is completed by using glass (Glass). a first glass concentrating lens 32 (usually a spherical mirror), a first plastic concentrating lens 33 (usually an aspherical mirror) made of plastic, and a glass-glued (Glass+Glue) conjugate (trichroic prism) Assembly) 34. Array lenses 35, 36, 37 made of plastic. It can be seen from the figure that many components are made of plastic, and light containing ultraviolet (UV) components will cause The deterioration of these plastics reduces the light transmittance. Therefore, in order to block the ultraviolet light generated by the light-emitting diode 31, the plastic component in the system is damaged. This embodiment is provided between the first light-emitting diode 31 and the first glass concentrating lens 32 (before the first plastic concentrating lens 33 and the array lens 35, 36, 37 made of plastic) The filter device, in this case, is a glass filter 39, which has the ability to filter out ultraviolet light (UV), so that there will be no ultraviolet (UV) component in the subsequent light. This will not degrade the components or glued materials that are finished with plastic, thus improving the conventional technology.

Referring to FIG. 4 , it is another schematic structural diagram of the light source module 10 of the present invention, which includes a first light emitting diode 31 for emitting light containing ultraviolet (UV) components and passing through the glass (Glass The completed first glass concentrating lens 32, the first plastic concentrating lens 33 made of plastic, the glazed glaze 34 with glass glue (Glass+Glue), and the array lens made of plastic (Plastic) 35, 36, 37. As can be seen from the figure, in this embodiment, a glass filter 40 is attached to the surface 320 of the first glass concentrating lens 32 made of glass (of course, it can also be formed on the surface by coating). 320)), the glass filter 40 has the ability to filter out ultraviolet light (UV), so that there will be no ultraviolet (UV) component in the subsequent light, so that plastic will not be used (Plastic) The finished component or the glue material deteriorates, thereby improving the prior art.

Referring to FIG. 5 , it is a schematic diagram of a further detailed structure of the light source module 10 of the present invention. In this embodiment, the glass cover of the first light-emitting diode 31 is used to filter ultraviolet light (UV). The filter 50 of the capability (of course, it can also be formed on the light-emitting surface 310 of the first light-emitting diode 31 by means of coating), so that there will be no ultraviolet light in the subsequent light (UV). The composition, which will not deteriorate the components or glued materials completed with plastic, thereby improving the conventional technology.

6A and 6B show the details and filter characteristics of the filter 60 having the ultraviolet light (UV) filtering ability. FIG. 6A mainly shows that the light incident surface of the filter 60 is plated with ultraviolet light. The (UV) filter layer 601, and the light exit surface of the filter 60 is plated with an anti-reflection layer 602. The filter specification characteristic of Fig. 6B shows the ultraviolet light transmittance of different wavelengths. At the fourth point in the figure, the transmittance of the wavelength 424 nm is reduced to ten percent, and at the fifth point. The transmittance for wavelengths less than 436 nm is reduced to 0.5%, which will effectively block most of the UV light.

Since the case is based on the three primary color light-emitting diodes to mix out the white light, and the light-emitting diodes produced by the various brands are measured, it is found that the green light and the blue light-emitting diodes may generate ultraviolet light (UV). However, depending on the manufacturer, some of them have ultraviolet (UV) light, and some have only green light emitting diodes or blue light emitting diodes, so the above filters 39, 40, 50 or 60 is disposed in the optical path of the green or blue light emitting diode as needed, and of course, the first filter device may be disposed between the first light emitting diode 31 and the first plastic collecting lens 33. A second filter device may be disposed between the second light emitting diode and the second plastic concentrating lens for filtering the ultraviolet light component in the second light emitted by the second light emitting diode.

Referring to FIG. 7 , which is a schematic diagram of the light source module designed to retain elasticity, the first slot 71 and the second slot 72 are mainly added to the green light emitting diode ( The filter is placed in the optical path of the first light-emitting diode or the blue light-emitting diode (second light-emitting diode), and the treatment can be selected according to actual needs, and the flexibility of the setting is increased and omitted. Unnecessary filter costs. The first slot 71 and the second slot 72 can be completed by reshaping the housing in the original light source module without additional hardware.

In this way, the present invention can improve the lack of brightness decay with time, and the hardware architecture of the embodiment of the present invention can be applied to various projector systems, and can effectively improve the properness of the system, thereby improving the lack of the prior art. effect. However, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, A person skilled in the art can make some modifications or modifications to equivalent embodiments by using the above-disclosed technical contents without departing from the technical scope of the present invention. It is still within the scope of the technical solution of the present invention to make any simple modifications, equivalent changes and modifications to the above embodiments.

10‧‧‧Light source module

11‧‧‧Array lens

12‧‧‧Polarized light converter

13‧‧‧ Concentrating lens

14‧‧‧ Polarized separation稜鏡

140‧‧‧Incoming surface

149‧‧‧Polarizer

150‧‧‧ phase retarder

15‧‧‧矽-based LCD module

16‧‧‧ imaging lens set

20‧‧‧Polarizer module

200‧‧‧ polarizer diaphragm

201‧‧‧First transparent hard substrate

202‧‧‧Second transparent hard substrate

122‧‧‧Polarizing beam splitter

123‧‧‧ phase retarder

124‧‧‧Light transmission area

110‧‧‧ coating

31‧‧‧First Light Emitting Diode

32‧‧‧First glass concentrating lens

33‧‧‧First plastic concentrating lens

34‧‧‧合光稜鏡

35, 36, 37‧‧ ‧ array lens

39‧‧‧glass filter

320‧‧‧ surface

40‧‧‧glass filter

50‧‧‧Filter

310‧‧‧Lighting surface

60‧‧‧Filter

601‧‧‧Filter film layer

602‧‧‧Anti-reflective layer

71‧‧‧First slot

72‧‧‧second slot

FIG. 1 is a schematic diagram showing the structure of an optical path of a micro projector according to the present invention. Fig. 2 is a schematic view showing another preferred embodiment of the above-mentioned reflective polarizing plate. FIG. 3 is a schematic view showing the detailed structure of the light source module of the present invention. FIG. 4 is a schematic view showing another detailed structure of the light source module of the present invention. FIG. 5 is a schematic structural view of a further detail of the light source module of the present invention. Fig. 6A is a schematic view showing the construction of the filter in the present case. Fig. 6B is a schematic view showing the specification of the filter in the present case. FIG. 7 is a schematic structural view showing another structure of the filter arrangement in the light source module of the present invention.

Claims (8)

A projector structure includes: a light source module comprising at least a first light emitting diode, a first plastic collecting lens, a second light emitting diode, a second plastic collecting lens, and a combination a first light emitting diode, wherein the first light emitting diode emits a first light through the first plastic collecting lens to enter the light combining port, and the second light emitting diode emits a second light through the first light emitting diode a first concentrating lens is disposed between the first illuminating diode and the first plastic concentrating lens for filtering the ultraviolet light in the first ray After the light component enters the first plastic concentrating lens; a light guiding module is configured to receive the light source module to send light and send a first polarization type light; a 矽-based liquid crystal module receives the light guiding The first polarization type light sent by the module is modulated and converted into the second polarization type light carrying the image and then penetrates the light guiding module; and an imaging lens group receives the penetration The second polarization type of light of the light guiding module is focused and imaged. The projector structure of claim 1, further comprising a second filter device disposed between the second light emitting diode and the second plastic collecting lens for filtering the second light After the ultraviolet component, the light is entered. According to the projector structure of claim 2, the light source module includes a first slot and a second slot for respectively movably placing the first filter device and the second filter device The first filter device and the second filter device are respectively completed by a glass filter. According to the projector structure of claim 3, the light-incident surface of the glass filter is plated with a filter film layer blocking ultraviolet light, and the light-emitting surface thereof is plated with an anti-reflection layer. The projector structure of claim 1, further comprising a first glass collecting lens between the first light emitting diode and the first plastic collecting lens, wherein the first filter device is disposed The surface of the first glass concentrating lens is configured to filter the ultraviolet light component in the first light before entering the first plastic concentrating lens. The projector structure of claim 1, wherein the first filter device is a glass protective cover having ultraviolet light (UV) filtering capability covering the light emitting surface of the first light emitting diode. According to the projector structure of claim 1, wherein the light source module further comprises an array lens made of plastic for homogenizing the light sent by the combined light to be sent to the light guiding mode. group. The projector structure of claim 1, further comprising a first slot and a second slot between the first LED and the first plastic concentrating lens and the second The light emitting diode is disposed between the second plastic collecting lens and the second plastic collecting lens to provide an alternative placement of the first filter device.