TWI670558B - Projector - Google Patents

Abstract

A projector includes a light source, a light leveling element, a light valve, and a light transmissive optical component. The light source can output an illumination beam, and the light homogenizing element, the light valve and the optical element are disposed on the traveling path of the illumination beam. The optical component is disposed between the light valve and the light homogenizing element and is located on the traveling path of the illumination beam. A surface of the optical component is provided with a filter film, and the filter film is completely covered by the illumination beam.

Description

Projector

The present invention relates to a projector, and the present invention relates to a projector having better picture uniformity.

The image projected by the projector is affected by various factors such as material absorption or lens coating, which may cause the intensity distribution of the three colors of RGB to be inconsistent, resulting in poor uniformity of the chromaticity of the picture. For example, the intensity of a certain color in the central region is strong and surrounded. This color light is relatively weak. Therefore, the color average specification cannot be met. For example, the white color coordinate difference value of the entire screen needs to be less than 0.005. When a plurality of projectors are used to splicing a screen of a TV wall, the problem of poor color uniformity of the screen is highlighted at the seam, and the overall quality and visual effect of the stitched picture are reduced.

According to one aspect of the present invention, a projector is provided that includes a light source, a leveling element, a light valve, and a light transmissive optical element. The light source can output an illumination beam, and the light homogenizing element, the light valve and the optical element are disposed on the traveling path of the illumination beam. The optical component is disposed between the light valve and the light homogenizing element and is located on the traveling path of the illumination beam. A filter film is disposed on a surface of the optical component, and the filter film is completely covered by the illumination beam.

According to another aspect of the present invention, a projector is provided comprising an integrator, a light valve, an optical element, and a filter disposed on a path of travel of the illumination beam. The optical component and the filter are disposed between the light valve and the integrator, and the effective filter range of the filter is smaller than the range of the illumination beam at the position of the filter.

According to the above aspect of the present invention, by providing a filter structure on the surface of the optical element or between different optical elements, which can filter out or weaken the color light having a relatively strong intensity in a specific region, the brightness of a certain color in the partial region of the screen can be improved. However, the problem of uneven intensity distribution compared with other color lights meets the requirements of color uniformity specifications. Furthermore, when a plurality of projectors are used to splicing a screen of a TV wall, since the respective projection screens have good color uniformity, the overall screen color after splicing changes smoothly and has a better visual effect.

In order to make the invention more apparent, the following embodiments are described in detail with reference to the accompanying drawings.

1, 2, 3, 4, 5‧‧‧ projector

10‧‧‧Light source

12‧‧‧Homogeneous components

12’‧‧‧ integrator

14‧‧‧ turning mirror

16‧‧‧Optical components

18‧‧‧Support

20‧‧‧Filter film

20’‧‧‧Filter

22‧‧‧Optical components

30‧‧‧Light valve

I‧‧‧ illumination beam

L‧‧ lens

LS’‧‧‧Glossy

N‧‧‧ groove

P‧‧‧ surrounding blocks

TS, LS‧‧‧ Yingguang

MR‧‧‧Light edge

1 is a schematic diagram showing the outline of a projector according to an embodiment of the present invention.

2 is a schematic diagram showing the outline of a projector according to another embodiment of the present invention.

3 is a schematic diagram showing the outline of a projector according to another embodiment of the present invention.

4 is a schematic diagram showing the outline of a projector according to another embodiment of the present invention.

FIG. 5 is a schematic diagram showing the outline of a projector according to another embodiment of the present invention.

6A and 6B respectively show the light intensity region distribution maps of the respective colors filtered with or without the red filter.

The foregoing and other technical aspects, features and advantages of the present invention will be apparent from In addition, the terms "first" and "second" used in the following embodiments are used to identify the same or similar elements, and the directional terms such as "front", "back", etc. are merely referenced to additional drawings. The orientation is not intended to define the components.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of a projector according to an embodiment of the present invention. In the projector 1, according to the traveling path of the bright light beam, the light source 10 provided on the traveling path of the illumination light beam, the light homogenizing element 12, the turning mirror 14, the optical element 16, the filter film 20, the optical element 22, and the like are sequentially included. Light valve 30. Light source 10 provides an illumination beam I. The optical element 22 is disposed between the light valve 30 and the light homogenizing element 12.

In this embodiment, the light source 10 can be a conventional thermoelectric light source, a fluorescent lamp, a light emitting diode, a laser emitting diode light emitting element, or other device or component that can provide illumination light. In this example, the light source 10 is a packaged white light emitting diode light emitting module with phosphor powder.

In the present invention, the "homogeneous element" 12 means a lens array (LENS ARRAY), an integral column type (INTEGRATE ROD), a rotatable crucible, or the like, which can be used for uniform or uniform light. In this example, the light homogenizing element 12 is a solid integrating column.

In this example, the turning mirror 14 can be a planar, concave or convex mirror; its reflective surface can be an aspheric surface or a free curved surface. In this example, the turning mirror is a flat mirror that reflects the illumination.

The term "optical element" as used in the present invention means that the element has a part or all of a material that can be reflected or penetrated, and usually consists of glass or plastic. For example, the optical element can be a lens, TIR Prism, RTIR Prism, various integrators, various filters, and the like. In this embodiment, the optical element 16 is a lenticular lens having a positive diopter and at least a portion of the light passing therethrough.

In this embodiment, the shape of the filter film 20 is not limited, and is not limited to a film shape, and may also be an adhesive filter film, a coating film, a filter member or a permeable optical surface, and has a filter. Optical surfaces or components other than a specific wavelength capability. In this example, the filter film 20 is at least filterable. The optical coating of a portion of the red light range wavelength, but the light filtered by the filter film 20 is not limited to red, but may be, for example, blue light, green light, UV, IR or light having a specific polarity.

In this embodiment, the optical element 22 can be a field lens, a total internal reflection enthalpy (TIR PRISM) composed of a plurality of turns, or a reverse total internal reflection 稜鏡 group including a single ridge (RTIR). PRISM). In the present embodiment, the optical element 22 is a total internal reflection group formed by two full turns, and each of the light incident surface and the light exit surface of the optical element 22 are flat.

The term light valve 30 has been widely used in the projection industry and is used in the industry to refer to some of the individual optical units in a Spatial Light Modulator (SLM). A so-called spatial light modulator, comprising a plurality of independent units (independent optical units), which are spatially arranged in a one-dimensional or two-dimensional array. Each unit can independently control optical signals or electrical signals, and use various physical effects (Pockels effect, Kerr effect, acousto-optic effect, magneto-optic effect, self-electrooptic effect of semiconductor or photorefractive effect) to change itself. The optical characteristic is such that illumination of the illumination beam of the plurality of individual units is modulated and the image beam is output. The individual unit can be an optical component such as a micro mirror or a liquid crystal cell. That is, the light valve may be a Digital Micro-mirror Device (DMD), a liquid-crystal-on-silicon panel (LCOS Panel), or a transmissive liquid crystal panel.

The projector is a device that projects an image onto a screen by optical projection. In the projector industry, the projector is generally classified into a cathode ray tube (Cathode Ray Tube) projection depending on the light valve 30 used internally. Liquid crystal display (LCD) projectors, Digital Light Projector (DLP), and Liquid Crystal on Silicon (LCOS) projectors that pass through the LCD panel when the projector is operating As a light valve, it is a penetrating projector, and a projector using a light valve such as LCOS or DLP is It is developed by the principle of light reflection, so it is called a reflective projector. In the present embodiment, the projector is a digital light projector, and the light valve 30 is a digital micromirror device (DMD).

In this embodiment, the illumination beam I is converted into an image beam by the light valve 30 and then output through the optical element 22, and the filter film 20 does not affect the imaging of the image beam when disposed outside the traveling path of the image beam. For better design. The filter film 20 may be disposed at a light incident surface of the optical element 22 (total reflection 稜鏡). As shown in FIG. 1, the illumination beam I emitted by the light source 10 is homogenized via the homogenizing element 12, passes through the lens L, enters the total internal reflection 经由22 via the filter film 20, and is projected to the light valve 30. The filter film 20 can provide the effect of filtering out or attenuating the specific color light. If there is a problem that the intensity of the light in a certain area of the screen is too high and the periphery is weak, the filter film 20 disposed on the surface of the total internal reflection 稜鏡 22 can weaken the color light. The intensity of the region improves the uneven distribution of the intensity of the projected light.

For example, if the center of the picture projected by the projector 1 is strong in red and the surrounding red light is weak, for example, a dichroic mirror-RED can be used to filter or weaken the total internal reflection from the central portion. 22 and enter the red light of the light valve 30 to improve the color uniformity of the entire screen.

2 is a schematic diagram of a projector according to another embodiment of the present invention. In the present embodiment, a filter film 20 of the projector 2 can be disposed on a light-facing surface LS of the lens L and on the traveling path of the illumination light beam I. Only a single lens L is schematically illustrated in FIG. 2, but those skilled in the art can understand that a plurality of lenses can be disposed between the light-emitting element 12 and the light valve 30, and the optical element 22 provided with the filter film 20 can be Among these lenses, the lens L closest to the light valve 30 or the total internal reflection 稜鏡22. The filter film 20 disposed on the light-incident surface LS of the lens L can also reflect, absorb, or wavelength-convert the color light of a relatively strong intensity in a specific region, so that the color of light entering different regions of the light valve is uniform. It should be noted that the formation position of the filter film 20 on the lens L is not limited, and the other is In the embodiment, the filter film 20 may be formed on the light-emitting surface LS' of the lens L or at different regions on the light-incident surface LS and the light-emitting surface LS'.

In the above embodiment, the filter film 20 disposed on the surface of the optical element 22 can be completely covered by the illumination beam I. For example, as shown in FIGS. 1 and 2, the filter film 20 disposed on the surface of the optical element 22 completely falls within the region defined by the outermost edge MR of the light beam emitted by the light homogenizing element 12. That is, if the illumination beam I forms a projection area on the extending plane of the filter film 20 in the direction perpendicular to the optical axis, the edge MR of the projection area is as shown in FIG. The filter film 20 will completely fall into the projection area, and the overall area of the filter film 20 will be smaller than the area of the projection area of the illumination beam I at the position of the filter film 20.

3 is a schematic diagram of a projector according to another embodiment of the present invention. In the present embodiment, the projector 3 includes a light source 10, an integrator 12', a lens L, a filter 20', a total internal reflection 稜鏡22, and a light valve 30.

The term "integrator" 12' of the present invention, or an optical integrator, can be used to homogenize light. The integrator can be divided into two types, LENS ARRAY or INTEGRATE ROD. The integral column light integrator can be a hollow or non-hollow rod or column integrator. The lens array integrator can be a fly-eye lens. In this example, the integrator 12' is a solid integrating column.

In the embodiment, the light source 10 is a packaged white light emitting diode module with phosphor powder, and provides an illumination beam I. The integrator 12', the light valve 30, the lens L, and the total internal reflection 稜鏡 22 are all disposed on the traveling path of the illumination beam I. A filter 20' is disposed between the integrator 12' and the light valve 30 and is located on the path of travel of the illumination beam I. In this embodiment, the filter 20' can be located between the lens L and the total internal reflection 稜鏡22, and the filter 20' is effectively filtered. The range of illumination beams is less than the location of the filter 20'. The "effective filter range" refers to the entire area of the filter that has the ability to filter. If the filter has a filtering ability on the periphery, it is part of the effective filter range even if no light passes. Furthermore, the projection plane of the illumination beam I in the direction perpendicular to the optical axis of the filter 20' can form a projection area which is the illumination beam range of the position of the filter 20'. The filter 20' can also provide the effect of filtering out or attenuating the color of the relatively strong intensity of the specific area, and improving the color uniformity of the projected picture. The position of the filter 20 ′ between the integrator 12 ′ and the light valve 30 is not limited. As shown in FIG. 4 , the filter 20 ′ may also be disposed on the integrator 12 ′ of the projector 4 (or a turning mirror). 14) between the lens L.

In the above embodiment, the shape of the filter 20' is not limited and is not limited to a sheet shape, and may also be a diaphragm, a coating, a filter, etc., such as an attenuator, a color filter, a high pass/low A pass filter, a band pass filter, a dichroic mirror, etc. are examples. In this example, the filter 20' is an attenuator that filters red light proportionally. Further, the filter 20' can be independently provided and supported by a support member 18 to be disposed on the optical path between the integrator 12' and the total internal reflection cymbal 22. The support member 18 around the filter 20' can be, for example, a light-transmissive flat glass or a single support rod without limitation, and the support member 18 can be integrally formed with at least a portion of the filter 20' (ONE PIECE FORMED) .

In an embodiment, the length of the filter film 20 (or the filter 20') in the direction of the vertical optical axis may be smaller than the optical element in front of the optical path (for example, the lens L) or the optical element behind the optical path (for example, total internal reflection) Cle 22) has a clear aperture, or both is smaller than the clear aperture of its front and rear optical components. The term "clear aperture" as used herein refers to the diameter of a portion of the lens or crucible surface that is formed to assist in producing optical properties. For example, a lens or a peripheral region is formed with a flange or other structure for positioning assembly, etc., which is located outside the optically effective diameter of the lens or cymbal. In addition, the light-emitting surface of the filter film 20 and the filter 20' can be It is disposed upstream of the optical path of the optical element 16 or the optical element 22, or at a position before the light enters each of the optical elements 16, 22.

Furthermore, the color filter type and the filter region to be filtered by the filter film 20 (or the filter 20') are not limited at all, and the filter device 20 (or the filter 20) can be configured according to actual needs. ') The selected position in the light path and applied to the desired environment to reduce the specific color light to achieve a uniform color of the picture. For example, as shown in FIG. 5, the filter film 20 (or the filter 20') can be simultaneously disposed on different optical elements on the optical path and can separately filter different color lights, such as the total internal reflection of the projector 5. 22 may be glued to a red filter 20' to reduce red light, and a partial area of the surface of the lens L may be plated with a green filter film 20 to reduce green light.

6A and 6B respectively show the light intensity region distribution maps of the respective colors filtered with or without the use of a dichroic mirror-RED, wherein the abscissa is different from the center of the picture (0) to the outermost edge (18). The position point is measured, and the abscissa value 10 to 18 is the measurement point at the outermost periphery of the screen, and the ordinate is the normalized intensity percentage of red light (R), green light (G), blue light (B), and white light (W). The numerical values of Figs. 6A and 6B are normalized by taking the luminance of the center point of the screen to a maximum value of 100%. It can be seen from FIG. 6A that the red light in the corner area of the picture is weak, so that the intensity of the green light/blue light is relatively large, and after filtering, the maximum value of the red light in the central area of the picture is reduced, so that the picture is three. The intensity distribution of the color light (RGB) is more consistent as shown in FIG. 6B, and the effect of uniform color of the screen is achieved.

By the design of each of the above embodiments, by setting a filter structure on the surface of the optical element or between different optical elements, which can filter or weaken the color light of a relatively strong intensity in a specific region, the brightness of a certain color in the partial region of the screen can be improved. Too high, and the uneven distribution of intensity compared with other shades of light, in line with the requirements of color specifications. Furthermore, when a plurality of projectors are used to splicing a screen of a TV wall, since the respective projection screens have good color uniformity, the overall screen image after splicing The color change is smoother and has better visual effect.

Various details can be freely changed when the invention is applied. For example, in the foregoing example, it is mentioned that a small-sized filter is used to filter the red light in the middle portion of the illumination light to achieve uniform color intensity at the center and edge of the picture. However, in addition to the red filter, it is also possible to change the filter or filter film of other color light to achieve the relative effect. In addition, the filter or the filter film is not limited to the center of the optical surface, and if necessary, it can be adjusted as needed.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

Claims (10)

A projector comprising: a light source for outputting an illumination beam; a light homogenizing element disposed on a path of the illumination beam; a light valve disposed on the path of the illumination beam; and a light transmissive An optical component is disposed between the light valve and the light homogenizing element and located on a path of the illumination beam. A surface of the optical component is provided with a filter film, and an effective filter range of the filter film is The illumination beam is within an illumination range of the position of the optical element, and the effective filter range of the optical element is less than the illumination range. The projector of claim 1, wherein the permeable optical element is a total internal reflection 稜鏡, and the filter film is disposed on the light incident surface of the total internal reflection 稜鏡. The projector of claim 1, wherein the permeable optical element is a lens, and the filter film is disposed on a surface of the lens. A projector comprising: a light source for outputting an illumination beam; an integrator disposed on a path of the illumination beam; a light valve disposed on the path of the illumination beam; and a light transmissive optical component Between the light valve and the integrator, and located on the traveling path of the illumination beam; and a filter disposed between the light valve and the integrator and located on the traveling path of the illumination beam The effective filter range of the filter is smaller than the range of the illumination beam at the position of the filter. The projector of claim 4, wherein the filter is bonded to the optical element. The projector of claim 4, wherein the light exiting surface of the filter is disposed upstream of the optical path of the optical component. The projector of claim 1 or 4, wherein the optical element is a unit. The projector of claim 1, wherein a plurality of lenses are disposed between the light valve and the light source and on a path of the illumination beam, and the optical component is the lightest of the lenses. The lens of the valve. The projector of claim 4, wherein the filter is a red filter that filters red light. The projector of claim 4, wherein the light source, the integrator, the filter, the optical element, and the light valve are sequentially included along a travel path of the illumination beam, and the integrator is An integral column; the filter is a red filter that filters red light, the optical component is a total reflection 稜鏡 group, including two turns; the light valve is a digital micromirror component.