TWI680341B - Light source module for projecting device - Google Patents

Abstract

A light source module for a projection device includes an optical notch filter and a light source unit. The optical notch filter is disposed at a predetermined position. The optical notch filter includes a light-transmitting substrate, an anti-reflection film layer, and a dielectric multilayer film. On one surface, the dielectric multilayer film is formed on a second surface of the transparent substrate. The light source unit includes at least one excitation light source and a wavelength conversion element, and the light source unit is configured to generate a projection light irradiated on the predetermined position; wherein the projection light passes through the optical notch filter, and The electric multilayer film filters out a light source in a specific band, and the wavelength of the specific band is between 550 nm and 600 nm.

Description

Light source module for projection device

The invention relates to a light source module for a projection device, in particular to a light source module for a projection device, which is used to provide a light source, and to filter out light and provide light of a correct wavelength to other optical elements of the projection device.

In order to unify color standards, the HDTV World Uniform Standards formulated by the International Telecommunication Union ITU have several basic image standards, such as D65 for standard color temperature 6500K, and ITU-R BT.709 (Rec.709) for standards. Color gamut.

The performance of current High Definition (HD) projectors, HD LCD TVs, and some HD displays, among which the benchmark for testing color gamut is to meet the Rec.709 standard. This means that when watching a Blu-ray Disc movie, the projected picture can accurately represent the original color gamut standard of the Blu-ray Disc, and can more accurately watch the color tones that film and television producers want to show.

Generally, a common projection system is provided with a filter in front of the light source, and after filtering unnecessary unnecessary invisible light, it is separated by the filter structure of the color wheel, and then sent to other optical elements for projection. Visible filters are the key to projection systems. Therefore, how to propose a filter that can meet the Rec.709 standard has become an important subject in this technical field.

The technical problem to be solved by the present invention is to provide a method for a projection device. A light source module that provides an optical notch filter that can meet the Rec. 709 standard.

In order to solve the above technical problems, according to one aspect of the present invention, a light source module for a projection device is provided, which includes an optical notch filter and a light source unit. The optical notch filter is disposed at a predetermined position. The optical notch filter includes a light-transmitting substrate, an anti-reflection layer, and a dielectric multilayer film. The anti-reflection layer is formed on the substrate. The first surface of the transparent substrate, and the dielectric multilayer film is formed on the second surface of the transparent substrate. The light source unit includes at least one light source and a wavelength conversion element, and the light source unit is configured to generate a projection light irradiated on the predetermined position; wherein the projection light passes through the optical notch filter, so The dielectric multilayer film filters out a light source in a specific wavelength band, and the wavelength of the specific wavelength band is between 550 nm and 600 nm.

The present invention has the following beneficial effects: By using the optical notch filter of the present invention, the projection display color can fall within the color gamut range of the chromaticity diagram, and the three primary color coordinate points can fall close to complete (> 98%) ) The range of three primary color coordinate points covering Rec.709 or BT.709 standard color gamut range.

In order to further understand the technology, methods and effects adopted by the present invention to achieve the intended purpose, please refer to the following detailed description and drawings of the present invention. It is understood, however, that the drawings and attachments are provided for reference and description only, and are not intended to limit the present invention.

10‧‧‧Main light source

10a‧‧‧time light source

17‧‧‧Combined light element

18‧‧‧ condenser

19‧‧‧ Collimator

20‧‧‧ Wavelength Conversion Module

20C‧‧‧Rotary wheel motor

21‧‧‧wavelength conversion element

30‧‧‧ Optical Notch Filter

300‧‧‧ Transparent substrate

301‧‧‧Anti-reflective layer

302‧‧‧ Dielectric Multilayer Film

304‧‧‧low refractive film

306‧‧‧High refractive film

303‧‧‧first optical layer

305‧‧‧second optical layer

40‧‧‧ lens module

43, 44‧‧‧ array uniform light lens

45‧‧‧polarized converter

46‧‧‧ rear condenser

50‧‧‧first polarizing film

60‧‧‧Display element

68‧‧‧ quarter wave plate

70‧‧‧ 稜鏡 Unit

78‧‧‧Second polarizing film

80‧‧‧ projection lens

A, S‧‧‧ color gamut range

A1, A2, A3, S1, S2, S3‧‧‧ primary color coordinate points

FIG. 1 is a schematic diagram of a first embodiment of a light source module used in a projection apparatus according to the present invention.

FIG. 2 is a schematic diagram of another embodiment of a light source module used in a projection device according to the present invention.

FIG. 3 is a schematic diagram of a first embodiment of an optical notch filter of the present invention.

FIG. 4 is a schematic diagram of a second embodiment of an optical notch filter of the present invention.

FIG. 5 is a schematic diagram of a color gamut range of a light source module according to the present invention in a chromaticity coordinate block.

Please refer to FIG. 1, which is a schematic diagram of a first embodiment of a light source module used in a projection apparatus according to the present invention. The invention provides a light source module for a projection device, which includes a light source unit, a wavelength conversion element 21 and an optical notch filter 30. In addition to the above-mentioned components of the projection device, the projection light passes through the lens module 40, the first polarizing film 50, the chirp unit 70, the quarter-wave plate 68, the display element 60, and the second polarizing film 78 in order. The projection lens 80 projects out. The display element 60 may be, for example, a liquid crystal silicon panel (Liquid Crystal on Silicon, LCoS). The lens module 40 may include array uniformity lenses 43 and 44, a PS-convertor 45 and a rear condenser 46. However, the invention is not limited to such an architecture.

As shown in FIG. 1, the wavelength conversion element 21 is driven by a rotary wheel motor 20C to form a wavelength conversion module 20. The wavelength conversion element 21 is disposed at a predetermined position. As shown in FIG. 3, the optical notch filter 30 includes a light-transmitting substrate 300, an anti-reflection layer 301, and a dielectric multilayer film 302. The anti-reflection layer 301 is formed on a first surface of the transparent substrate 300, and the dielectric multilayer film 302 is formed on a second surface of the transparent substrate 300.

The light source unit includes at least one light source, a condenser lens 18, a collimator lens 19, and a wavelength conversion module 20. The at least one light source is used to generate a projection light irradiated on the predetermined position. In this embodiment, the light source unit includes a main light source 10, the light source emits blue laser light, and the blue laser light directly shines on the wavelength conversion module 20, and the wavelength of the blue laser light is 400-500 nm between. This embodiment is a synthetic laser projection device using a blue laser light source as a base color. The light emitted by the blue laser is generated by the wavelength conversion module 20 to produce three colors of red, green, and blue. The wafer 60 forms an image as seen by the human eye.

Wherein, the projected light passes through the optical notch filter 30. One of the features of the present invention is that the dielectric multilayer film 302 filters out a light source in a specific band, and the wavelength of the specific band is in the range of 550 nm to 600 nm. Between meters. With this, the light source module used in the projection device of the present invention can reach the standardization of Rec.709 or BT.709. High definition television format.

Please refer to FIG. 2, which is a schematic diagram of another embodiment of a light source module used in a projection apparatus according to the present invention. In addition to the main light source 10, the light source module of this embodiment further includes a primary light source 10a, a light combining element 17, and a collimator lens 19. The secondary light source 10a emits red laser light, the direction of the red laser light is substantially perpendicular to the blue laser light, the wavelength of the red laser light is between 600-650 nm, and the light combining element 17 is at A position where the red laser light and the blue laser light cross.

Please refer to FIG. 3, which is a schematic diagram of a first embodiment of an optical notch filter of the present invention. The dielectric multilayer film 302 of this embodiment is made by overlapping a low-refractive film 304 and a high-refractive film 306. The low-refractive film 304 and the high-refractive film 306 refer to the refractive index of the two. The refractive index is higher than that of the low-refractive film 304. Due to the difference in refractive index, between the two refractive films, the light is partially reflected and partially refracted. For example, it can be made by overlapping the silicon dioxide film and tantalum pentoxide film, or the silicon dioxide film and titanium dioxide The films are made by overlapping. The plurality of low-refractive films 304 have approximately the same thickness, and the plurality of high-refractive films 306 have approximately the same thickness. The thickness of the dielectric multilayer film 302 is 1/4 wavelength. According to the wavelength of the light to be filtered out, the thickness of the refractive film is designed, and through the linear superposition of multiple reflected and transmitted light multiple times on the interface of each film, when the optical path difference is equal to the wavelength of the light, or multiple transmissions at the same phase The light will interfere and strengthen in phase, forming a strong transmitted light wave, while the reversed light waves cancel each other out. By properly designing a multilayer dielectric film system, filters with specific filtering performance can be obtained. The spectrum is a transmission rate of> 97% between 430nm and 550nm, a transmission rate of <1% between 565 ± 15nm and 600nm, and a wavelength of 600nm to 680 The transmission rate between nanometers is> 97%. With this, the present embodiment can filter out most of the light with a wavelength between 565 ± 15 nm and 600 nm, so as to approach the format of Rec.709 or BT.709 standardized high-definition television.

Please refer to FIG. 4, which is a schematic diagram of a second embodiment of the optical notch filter of the present invention. It also includes a first optical layer 303 and a second optical layer 305. The second optical layer 305 is disposed on the first surface of the transparent substrate 300, and the first optical layer 303 The anti-reflection layer 301 is disposed on the second optical layer 305. The anti-reflection layer 301 is disposed on the first optical layer 303. The first optical layer 303 is an ultraviolet filter, and the second optical layer 305 is an infrared filter.

Please refer to FIG. 5, which is a schematic diagram of a color gamut range of a light source module according to the present invention in a chromaticity coordinate block. The features and functions of the present invention are that, by using the optical notch filter 30 of the present invention, the projection display color can fall in the color gamut range S of the chromaticity diagram, and the three primary color coordinate points S1, S2, and S3, Nearly complete (> 98%) covers the range of the three primary color coordinate points A1, A2, and A3 of Rec.709 or BT.709 standard color gamut range A.

The three primary color coordinate points of Rec.709 or BT.709 standard color gamut range A are shown in the table below.

The above descriptions are only the preferred and feasible embodiments of the present invention, and any equivalent changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the scope of the present invention.

Claims (8)

A light source module for a projection device includes: an optical notch filter, the optical notch filter is disposed at a predetermined position, the optical notch filter includes a light transmitting substrate, a An anti-reflection layer and a dielectric multilayer film, the anti-reflection layer is formed on a first surface of the light-transmitting substrate, and the dielectric multilayer film is formed on a second surface of the light-transmitting substrate; a wavelength A conversion element; and a light source unit, the light source unit includes a main light source, a primary light source, and a light combining element, the light source unit is configured to generate a projection light irradiated on the predetermined position; wherein the main light source Emits blue laser light, the blue laser light is directly directed to the wavelength conversion element, and the wavelength of the blue laser light is between 400 nm and 500 nm; wherein the secondary light source emits red laser light, the red The direction of the laser light is substantially perpendicular to the blue laser light, and the wavelength of the red laser light is between 600 nm and 650 nm. The combined laser light and the blue laser light cross each other. Position; wherein the cast Light waves trapped by the optical filter, the dielectric multilayer film filter out light of a specific wavelength band, the wavelength of the specific band is located between 550 nm to 600 nm. The light source module for a projection device according to claim 1, wherein the dielectric multilayer film is made of a silicon dioxide film and a tantalum pentoxide film overlapping, or a silicon dioxide film and a titanium dioxide film are overlapped production. The light source module for a projection device according to claim 2, wherein the spectrum is a transmission rate of> 97% between 430 nm and 550 nm and a wavelength between 565 ± 15 nm and 600 nm The transmission rate is between <1%, and the transmission rate between 600nm and 680nm is> 97%. The light source module for a projection device according to claim 1, further comprising a first optical layer and a second optical layer, wherein the second optical layer is disposed on the first surface of the light-transmitting substrate, so that The first optical layer is disposed on the second optical layer, and the anti-reflection layer is disposed on the first optical layer. The light source module for a projection device according to claim 4, wherein the first optical layer is an ultraviolet filtering film, and the second optical layer is an infrared filtering film. A light source module for a projection device includes: an optical notch filter, the optical notch filter is disposed at a predetermined position, the optical notch filter includes a light transmitting substrate, a An anti-reflection layer, and a dielectric multilayer film, the anti-reflection layer is formed on a first surface of the light-transmitting substrate, and the dielectric multilayer film is formed on a second surface of the light-transmitting substrate; The dielectric multi-layer film is made of a silicon dioxide film and a tantalum pentoxide film overlapping, or a silicon dioxide film and a titanium dioxide film are overlapped; and a light source unit, the light source unit includes at least one light source and one For a wavelength conversion element, the light source unit is configured to generate a projection light shining on the predetermined position; wherein the projection light passes through the optical notch filter, and the dielectric multilayer film filters out a specific wavelength band Light, the wavelength of the specific wave band is between 550 nm and 600 nm; wherein the spectrum is a transmission rate of> 97% between 430 nm and 550 nm and a wavelength of 565 ± 15 nm Transmittance between 600 nm <1%, wavelength at 600 nm Transmittance between 680 nm> 97%. The light source module for a projection device according to claim 6, further comprising a first optical layer and a second optical layer, the second optical layer is disposed on the first surface of the light-transmitting substrate, so The first optical layer is disposed on the second optical layer, and the anti-reflection layer is disposed on the first optical layer. The light source module for a projection device according to claim 7, wherein the first optical layer is an ultraviolet filtering film, and the second optical layer is an infrared filtering film.