TWI223720B - Projector - Google Patents

Abstract

A projector comprising a light source, a first condenser element for receiving light beams of the light source and dividing the same into a plurality of beams, a second condenser element provided with a plurality of condensing devices at one surface thereof for the plurality of beams from the first condenser element and pervious to the plurality of beams while the second condenser element is opposite to the other surface of the first condenser element and reflective surfaces is provided on the respective condensing devices, a filter for filtering the beams from the second condenser element and inherently reflecting a part of the beams toward the reflective surfaces on the second condenser element, a modulation element for receiving the beams from the filter, and a projecting element for amplification and projecting the beams onto a screen, wherein most of the reflected beams from the filter is irradiated onto the reflective surfaces of the condensing devices on the second condenser element so as to allow them to be further reflected toward the filter.

Description

1223720 V. Description of the invention (1) 1. [Technical field to which the invention belongs] The present invention relates to a display system, and particularly to a display system that reuses reflected light. 1. [Previous Technology]

Please refer to FIG. 1, which is a partial schematic diagram showing a conventional display system. As shown in FIG. 1, the conventional display system mainly includes a light source 100; a set of light-concentrating elements 11 0 and 120 for a lens array for dividing parallel light rays from the light source into a plurality of light beams; a lens 130, It is used to superimpose a plurality of light beams from the focusing elements 110 and 120, and make the superimposed light uniform; and a rotary filter 140 ′ is rotated by a motor 150, so when it comes from the lens When the light of 130 is irradiated to the rotating filter 14o, three primary colors of red (R), green (G), and blue (B) can be generated. Therefore, the light beam of the three primary colors can be used to achieve the effect of full-color imaging. Please refer to FIG. 5 for details. In one embodiment, the surface of the filter 14 is generally formed with three primary color filters arranged in a spiral shape, that is, a red filter R, a green filter G, and a blue filter. The film β, so when the light is irradiated on the rotating filter 140 at a predetermined time, the filter 140 can sequentially generate three primary color beams after filtering. When a display system is used, when white light is irradiated on the red film of the filter 丨, both the green beam and the blue beam are reflected and filtered by the filter 14o, so the red produced by the filter 140 The brightness of the light beam is only about one-third of the original light intensity, that is, the filter will waste about two-thirds of the original light. Therefore, in the conventional display system, it is not only impossible to reflect about two-thirds of the light with the light crossover 140, but also due to the reflected light.

Page 7 1223720 V. Description of the invention (2) The temperature of the display system is increased. III. [Summary of the Invention] Therefore, it is an object of the present invention to provide a display system which can fully utilize the light reflected from the furnace lighter, thereby improving the efficiency of light utilization and improving the display quality of the image. .

A display system according to a first embodiment of the present invention includes: a light source; a first light collecting element for receiving the light beam of the light source, and splitting the light source i light beam into a plurality of light beams; a second light focusing A plurality of light-concentrating units corresponding to the light beams of the first light-concentrating element, so that the light beams of the first light-concentrating element pass through the light-concentrating units, and the second light-concentrating element corresponds to the first light-concentrating element On the other hand, the light-concentrating units are provided with a reflective surface; a filter is used to filter the light beam from the second light-concentrating element, and a part of the light beam reflected back is reflected to the light-condensing element on the second light-concentrating element. Iso-reflective surface; a modulation element for receiving a light beam from the filter; and a projection element for magnifying and projecting a light beam from the modulation element onto a screen; wherein, the filter The light beams reflected by the light source are mostly reflected to the light-reflecting surfaces on the units of the second light-concentrating element, and the light-reflecting surfaces reflect the light beam back to the filter. Preferably, the first light-condensing element and the second light-condensing element are lens arrays, and the lens array of the second light-concentrating element is provided on a plurality of light-concentrating units facing one side of the filter, and a width is provided. Reflective surface of j which is one-half the unit width. Also, preferably, the "Guangxuan" line is a color wheel.

Page 8 1223720 V. Description of the invention (3) Also, preferably, the light source is a parabolic arc lamp. Also, preferably, a convergent lens group is provided between the second condensing element and the filter, and the distance between the second condensing element and the filter can be greatly reduced by the convergent lens group. Also, preferably, the convergent lens group is a two separate convergent lens. A display system according to a second embodiment of the present invention includes: a light source 'system & two primary color light sources, and a focusing element for receiving the light beam of the light source, and splitting the light beam of the light source into multiple A second light-concentrating element, provided with a plurality of light-concentrating units corresponding to the light-beam of the first light-concentrating element, the second light-concentrating element corresponding to the other side of the first light-concentrating element, and the units being provided with reflection light A rotating filter for sequentially filtering the three primary color light beams from the second condensing element, while a part of the reflected light beam is reflected back to the special reflective surface on the «-5 ^ light element, a modulation An element for receiving a light beam passing through the filter; and a projection element for amplifying and projecting a light beam from the modulation-variation element to a screen; wherein the light beam reflected by the filter is Most of them are reflected to the reflective surfaces on the units of the second light-concentrating element, and these reflective surfaces reflect the light beam back to the filter. Preferably, the first light-condensing element and the second light-condensing element are lens arrays, and the lens array of the second light-concentrating element is provided on a plurality of lens rows on one side away from the first light-concentrating element, and has a width Reflecting surface that is one-half the unit width. Also, preferably, a plurality of lens rows of the lens array are respectively provided with a light-reflecting surface having a width which is one-half the width of the light-concentrating unit. Also, preferably, the rotary filter is a color wheel. ’

Page 9 1223720 V. Description of the invention (4) Another 'preferably' the rotating light is a color wheel with a spiral dichroic diaphragm. Also, preferably, the light source is a parabolic solitary lamp. Also, preferably, a converging lens group is provided between the second condensing element and the filter, and the distance between the second condensing element and the filter can be greatly reduced by the converging lens group. Also, preferably, the convergent lens group is a two separate convergent lens. Fourth, [Embodiment] Please refer to FIG. 2. FIG. 2 shows the display system of the first embodiment of the present invention. 0 The display system of this embodiment not only makes full use of the reflected light of the filter 14 to improve the display system. The light utilization efficiency in the medium can prevent the temperature of the display system from rising to the south. In detail, the display system of this embodiment has the same elements as those in the conventional display system of FIG. 1, that is, the light source 10, the first focusing element 11, the second focusing element 12, and the lens 13 of the lens array. In addition to the filter 14, and the motor 15, it also has a lens 16 and a lens 13 forming a convergent lens group, and the condensing lens group can greatly reduce the distance between the second condensing element 12 and the light flux i 4. Distance, the reflecting surface 17 ′ is disposed on one side of the second light-condensing element 12 facing the filter 14, and as shown in FIG. 3, the width of the light-reflecting surface 17 is the light-concentrating unit of the second light-condensing element 12. One half of the width of 1 2 2 can make the reflected light of the light receiver j 4 just incident on each reflective surface 17 and then reflected from the reflective surface 7 to the filter 14 to pass through the furnace, Optical device 1 4; a group of relay lenses (re 1 ay

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Page 10! 22372 05. Description of the invention (5) lens) 20, for condensing the light output from the filter 14 and further improving aberration; a modulation element 18, the modulation element 18 In this embodiment, it is a digital micromirror display panel (DMD, Digital Mirror Device), but this type of panel is not limited during implementation. The modulation element 18 is used to receive light from the relay lens 20. And a projection element 19 for amplifying the light from the modulation element 18 and projecting it to a screen. When the light from the upper half of each light-concentrating unit 122 of the second light-concentrating element 12 is incident on the filter 14 and reflected, it is bound to be reflected on the light-reflecting surface 17 below the same light-concentrating unit 1 22, then the light-reflecting surface 17 can reflect the light back to the filter 14 again, so the use of the reflected light of the filter 14 can be increased, thereby improving the image quality of the f display system. In order to verify the effect that the display system and the conventional display system of this embodiment can use the reflected light of the existing filter 丨 4, the following is a theoretical calculation of the effect of this embodiment: -False δ The luminous flux of the filter 14 is 1/3 ', then the total luminous flux that the display system of this embodiment can achieve by reusing the reflected light of the filter 14 is: ^ The display system of this embodiment: 1 / 3 + (2/3 X 1/3) = 5/9 and 55.6% 〇 As can be seen from the above, the display system of this embodiment can use the total luminous flux of the reflected light of the filter 丨 4 (ie, 55 · 6%) is better than the conventional display system that can no longer use the reflected light of the filter 14, which is sufficient to improve the light utilization efficiency and significantly increase the brightness in the display system, while preventing the temperature of the display system from rising. '' Please refer to FIG. 4, which is a diagram showing a second embodiment of the present invention, in which the display system of the present embodiment except for the fixed type filter 14 instead of the rotary type

Ϊ223720, description of the invention (6) Except for the photoresist 14, the other components are exactly the same as those in FIG. 2, where the fixed filter 1 4 'is a monochromatic filter, such as a red filter, Its luminous flux is about 1/2. In addition, the present inventor further calculated the effect of implementing this embodiment by theoretically calculating the luminous flux of the filter to be 1/2: assuming that the luminous flux of the filter is '/ 2', the display system of this embodiment reuses the filter The total luminous flux that can be achieved by the reflected light is: The display system of this embodiment: 1/2 + (1/2 X 1/2) = 3/4 = 75% 〇

^ It can be known from the above that the total luminous flux (that is, 75%) achieved by reusing the reflected light of the filter in the display system of this embodiment is better than that of the conventional display system that cannot reuse the reflected light of the filter, so It is sufficient to improve the light utilization efficiency and greatly increase the brightness in the display system, while preventing the temperature of the display system from increasing. Therefore, 'similar to the display system of the first embodiment, when the light from the upper half of each light unit 12 of the second light-concentrating element 12 is incident on the economizer ", 1 must be reflected to the same when reflected. Reflected by the light-concentrating unit 122; ^, ^ is re-reflected back to the calender 14, thereby improving the display product of the display system

The above-mentioned examples are not intended to make any changes made by the present invention only for the convenience of explanation. Narrowly limited to the car delivery, they are all the preferred embodiments of the present invention. Where according to the scope of this patent.

Page 12 1223720 Simple illustration of the drawing 5. [Simplified illustration of the drawing] Fig. 1 shows a partial schematic diagram of a conventional display system. Fig. 2 shows a schematic diagram of a display system according to a first embodiment of the present invention. Fig. 3 shows a configuration diagram of a reflective surface of a second light-concentrating element of the present invention. Fig. 4 shows a diagram of a second embodiment of the present invention. FIG. 5 shows a partial surface view of an optical filter according to an embodiment.符号 Description of element symbols 1 0, 1 0 0 ~ light source 11, 11 0 ~ first light collecting element 1 2, 1 2 0 ~ second light collecting element 1 2 2 ~ light collecting unit 1 3, 1 6 ~ convergence lens group 1 30 ~ lens 14, 14 ', 140 ~ filter 15, 150 ~ motor 1 7 ~ reflective surface 1 8 ~ modulation element 1 9 ~ projection element 2 0 ~ relay lens

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Claims (1)

1223720 ---- Case No. 92114225 ___ Month Day __ VI. Patent application scope There is a convergent lens group between the optical element and the filter. The second condensing element can be greatly reduced by the convergent lens group. The distance from the filter. 5. The display system according to item 1 of the scope of patent application, further comprising a relay lens for receiving light output from the filter and condensing the light on the modulation element. 6. The display system as described in item 4 of the scope of patent application, the convergent lens system is a two separate convergent lens. 7. A display system, including a light source that provides three primary color light sources; a first condensing element that is a lens array for receiving the light beam of the light source; The second light-concentrating element is a lens array corresponding to the light beam of the first light-concentrating element, and the lens array of the second light-concentrating element is provided on a plurality of lens rows facing one side of the filter, and a width of two is provided. One lens wide reflective surface; a rotating filter to sequentially filter the three primary color light beams from the second condensing element, while part of the reflected light beam is reflected to the reflective surfaces on the second condensing element ; A modulation element for receiving a light beam passing through the rotary filter; and a projection element for enlarging and projecting a light beam from the modulation element to a screen; wherein 'reflected by the rotating light filter' The light beams are mostly reflected on the reflective surfaces of the units of the second light-concentrating element, and these reflective surfaces reflect the light beams back to the rotating filter. 1223720 Amendment No. 9211422R VI. Patent Application Range 8 · As shown in the patent application scope item 7 display system, a plurality of lens rows of the lens array are provided with reflective surfaces having a width of one-half the lens width. 9. The display system according to item 7 of the scope of the patent application: The rotary filter is a color wheel. 10 The display system as described in item 7 of the scope of patent application, wherein the light source is a parabolic arc lamp. π. The display system according to item 7 of the scope of patent application, wherein a convergent lens group is provided between the second condensing element and the rotating filter, and the second condensing lens can be greatly reduced by the condensing lens group. The distance between the element and the rotating filter. / 1 2 · According to the obvious system described in item 11 of the scope of patent application, the convergence lens group is a two-separation convergence lens. Yi Mo Yong, 1 〇, 丄 /, 十 :: The display is not 糸, " First, further includes a 13. As described in item 7 of the scope of patent application ^ ^ ^ ^ τ m ^ ray 51 output light 'and The light is focused on the tortoise lens, which is used for receiving the filter and reads as a modulation element.