WO2005073952A1 - 発光方法、発光装置、投写型表示装置 - Google Patents
発光方法、発光装置、投写型表示装置 Download PDFInfo
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- WO2005073952A1 WO2005073952A1 PCT/JP2005/001138 JP2005001138W WO2005073952A1 WO 2005073952 A1 WO2005073952 A1 WO 2005073952A1 JP 2005001138 W JP2005001138 W JP 2005001138W WO 2005073952 A1 WO2005073952 A1 WO 2005073952A1
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- light emitting
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- generating means
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0235—Field-sequential colour display
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
- G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
- G09G3/2025—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having all the same time duration
Definitions
- Light emitting method light emitting device, projection display device
- the present invention relates to a light emitting method for a light source used in a projection display device that projects a large-screen image on a screen using a light generating unit as a light source, a light modulation element, a projection lens as a projection unit, and the like. , A light emitting device, and the like.
- projection-type display devices using various light modulation elements have been attracting attention as projection-type video devices capable of large-screen display.
- These projection display devices have a DMD (Digital Micromirror Device) that can change the direction of reflection by means of light radiated from a light source, which is a light generating means, and transmissive and reflective liquid crystals, and micromirrors arranged in an array.
- a light source which is a light generating means, and transmissive and reflective liquid crystals, and micromirrors arranged in an array.
- the projection lens enlarges and projects the image on a screen.
- the brightness emitted from the projection lens As important optical characteristics of the projected large screen, the brightness emitted from the projection lens, the uniformity of the brightness, the single color such as red, green, and blue, and three colors are synthesized. For example, color reproducibility, which is the ability to more faithfully reproduce the resulting color such as white, can be mentioned.
- FIG. 8 shows a light source unit 403 using a white lamp 401 such as an ultra-high pressure mercury lamp, an illumination unit 35 configured using optical means for enabling uniform illumination, and a light modulation element.
- a white lamp 401 such as an ultra-high pressure mercury lamp
- an illumination unit 35 configured using optical means for enabling uniform illumination
- a light modulation element A conventional projection display device using a reflective display element 41 and a projection lens 51 is shown.
- a hollow cylindrical rod integrator 32 formed by bonding a glass column or a mirror is used as an optical means for enabling uniform illumination.
- the rod integrator 32 reflects the light incident from the entrance side aperture into the rod integrator 32 for total internal reflection and mirror surface. By repeating the reflection at, the light propagates inside the rod, and a uniform light beam is emitted from the emission side opening. Further, by using the illumination unit 35 in which optical means such as the lens 33, the mirror, and the prism 36 are combined, it is possible to illuminate a highly uniform light beam on the reflective display element 41.
- the light beam emitted from a lamp 401 as light generating means is collected by a reflector 402 as light collecting means.
- the light beam emitted from the opening of the reflector 402 is a light beam with uneven brightness having a large luminance difference between the vicinity of the center and the peripheral portion of the light beam. Therefore, the above-mentioned rod integrator 32 emits a uniform light beam from the emission side opening. Further, the light beam emitted from the rod integrator 32 is positioned at a position where a reflective display element 41 capable of forming an image by light modulation is arranged by an illumination unit 35 such as a lens 33, a mirror, and a prism 36. Further, the light is propagated so as to form a light beam of an appropriate size in the effective area of the reflective display element 41.
- a white lamp 401 conventionally used as a general light source emits white light, and the white light illuminates the reflective display element 41 and projects a light beam light-modulated by the reflective display element 41.
- black and white that is, grayscale images are output. Therefore, when displaying a color image, it is necessary to separate white light into the three primary colors of red, green, and blue, and to combine the luminous fluxes of the three colors again.
- the white light emitted from the white lamp 401 is displayed by rotating a color separation filter called a color wheel 411 at a predetermined cycle within a display period of one image as shown in FIG.
- the color illuminating the element is divided into the three primary colors of light by coloring it in a time series of red, green, and blue, and the color of each color formed by one reflective display element 41 is The color image is realized by projecting the image on the screen.
- the color wheel 411 serves as a color separation filter 21 as a color filter. Between the lens 31 and the rod integrator 32.
- this projection display device even if an image displayed in a period for forming one screen (about 17 milliseconds in NTSC video display) is an image displayed in a different color, the image is displayed on the eyes.
- the incoming light is recognized for a fixed period of time, giving the illusion that images of different colors are shining at the same time, making it possible to display color images.
- Lighting unit 35 using prism 36 A reflection type display device 41 as the light modulation device for modulating the illumination light, and a
- a solid-state light source such as the light emitting diode 1 (a) -1 (c) that emits monochromatic light has a rising time from when power is supplied until almost all light outputs corresponding to the power are emitted. It is known that the fall time from when the power supply is stopped to when the light output almost disappears is 1 microsecond or less, which is much shorter than that of the conventional white lamp 401. That is, there is an advantage that the light emitting diode can be switched on and off instantly.
- the light emitting diode can emit monochromatic light, it is not necessary to separate the emitted light into another color. Therefore, like the light emitting diode 1 (a) 1 (c) shown in FIG.
- Light emitting diodes that emit red light (wavelength of about 600-700 nm), green light (wavelength of about 500-570 nm), and blue light (wavelength of about 430-490 nm) are used as light sources, and are controlled by control means (not shown).
- control means not shown.
- a color separation filter 21 such as a color wheel 411 for color separation used in an optical system using a conventional white lamp 401 as a light source is not required, and a simpler optical system is used. It is known that a projection display device having such a configuration can be constructed.
- the above-described projection display device using a solid-state light source such as the light-emitting diodes 1 (a) -1 (c) as a light source has the following problems.
- the white color formed by combining the three colors of red, green, and blue is on or substantially at the locus of the color temperature of 5000 10,000 K of blackbody radiation. It is desired that the light be adjusted so as to obtain nearby white light, and a white color greatly deviating from this range greatly deteriorates the image quality of the projected image.
- the white light on or near the locus of the color temperature of 5000 to 10000K of black body radiation slightly differs depending on the main wavelength of the light source used and the width of the spectrum. In many cases, the ratio of the amount of radiation is almost 1: 1: 1.
- Each of the red, green, and blue light beams has different brightness to the naked eye.
- the first control method adjusts the light intensity (the instantaneous light amount; the same applies hereinafter) of the light-emitting diodes of each color. Specifically, while controlling the green light emitting diode to emit light at the maximum light intensity, the light intensity of the red light emitting diode and the blue light emitting diode is controlled so as to be lower than the respective maximum light intensity.
- the light emission periods of the red, green, and blue light emitting diodes in FIG. 11 are made equal by dividing one image display period T (about 17 milliseconds in NTSC video display) into three.
- the light quantity of each light is the area (light intensity and light emission period) of the area 501 of the red light emitting diode 1 (a), the area 502 of the green light emitting diode 1 (b), and the area 503 of the blue light emitting diode 1 (c).
- This ratio gives the distribution ratio in consideration of the relative luminosity factor of the naked eye.
- the light intensity of the other light emitting diodes is determined based on the green light emitting diode 1 (b) as the maximum light intensity. ing. Therefore, the maximum light intensity of the green light emitting diode 1 (b) is a constraint on the whole, and once high color reproducibility of white light is secured, it is difficult to further increase the light amount.
- the value of the maximum light intensity of each color is determined based on the condition that the light emitting portion of the light emitting element is not destroyed, the amount of current, the specification of the product, the temperature condition and the amount of current that must be observed to extend the life. This is the maximum emission intensity obtained below.
- the following second control method is also performed.
- all the red, green, and blue light emitting diodes emit light at the maximum light intensity, and the light emitting periods of the light emitting diodes are varied so that the light emitting period of the green light emitting diode with a small amount of light is made longer.
- I do Specifically, in the display period T of one image, the light emitting period Gt of the green light emitting diode is longer than TZ3 of the display period of one image, and the light emitting periods Rt and Bt of the other light emitting diodes are shorter than that. Control so that blue is shorter than red).
- the light emitting period Gt of the green light emitting diode is longer than TZ3 of the display period of one image, and the light emitting periods Rt and Bt of the other light emitting diodes are shorter than that. Control so that blue is shorter than red).
- FIG. 12 all the red, green, and blue light emitting diodes emit light at the maximum light intensity, and the light emitting
- the amount of light perceived by the naked eye is represented by the area of a red light emitting diode region 511, a green light emitting diode region 512, and a blue light emitting diode region 513.
- the distribution ratio (for example, 3: 7: 1) considering the relative luminosity factor of the naked eye is given.
- the area (light amount) ratio of red, green, and blue is the same, but the absolute value, that is, the area (light amount) of each region is shown in FIG. Twelve is larger. Therefore, a higher amount of light can be obtained while maintaining the distribution ratio of each color.
- the light amount is the largest among red, green, and blue. Because of the green color, as a projection display device, if the lighting period of the green light emitting diode is lengthened to increase the amount of green light to increase the brightness of the emitted light, the white color becomes greenish white. . That is, there has been a problem that lighting for a predetermined lighting period or more for brightening deteriorates white color reproducibility.
- the present invention has been made in view of the above problems, and has a light emitting method, a light emitting device, and a projection display device using the same, which can increase the amount of light while maintaining color reproducibility.
- the purpose is to obtain the position.
- a first aspect of the present invention provides a first light generation unit that emits red light, a second light generation unit that emits green light, and a blue light emission
- a third light generation means for emitting light serving as an image light source comprising:
- the second present invention provides a control for making the light intensity of the first light generating means different between the first light emitting period and the fourth light emitting period.
- a light-emitting method which performs at least one control.
- a third aspect of the present invention is the method according to the first aspect, wherein the light emission amount of the first light generating means in the first light emission period, the second light emission period, and the third light emission period is the same as the second light emission period.
- the ratio of the light emission amount of the first light generation means, the light emission amount of the second light generation means, and the light emission amount of the third light generation means is the ratio of the light emission amount of the first light generation means, the light emission amount of the second light generation means, and the light emission amount of the third light generation means
- the first light emitting period, the second light emitting period, the third light emitting period, and the fourth light emitting period are each included in the display period of the one image.
- This is the light-emitting method according to the first aspect of the present invention, wherein the light-emitting method is allocated continuously or discontinuously.
- the first light emitting period, the second light emitting period, and the third light emitting period are consecutively or non-continuously in any order or in any order. Assigned to be continuous,
- the light emitting device according to a fourth aspect of the present invention, wherein the fourth light emitting period is assigned so as to be inserted into a period after the first light emitting period, the second light emitting period, and the third light emitting period have completed one cycle. Is the way.
- the fourth light emitting period is divided into the one image display period, and the first light emitting period, the second light emitting period, and the third light emitting period are divided.
- a fourth light emitting method according to the present invention wherein the light emitting method is assigned so as to be inserted between at least four light emitting periods of a period.
- a seventh invention is a light emitting device that emits light serving as an image light source, wherein the first light generation means emits red light;
- Second light generating means for emitting green light
- a third light emitting step of causing the third light generating means to emit light during a period, and simultaneously causing the first light generating means, the second light generating means, and the third light generating means to emit light during a fourth light emitting period A fourth light emitting step;
- Control means for controlling light emission of the first, second, and third light generation means so that
- the light-emitting device is a light-emitting device, wherein the control unit performs control to make at least one of the first light-emitting period, the second light-emitting period, and the third light-emitting period different from others.
- control means includes:
- a seventh light-emitting device which performs at least one control.
- control means includes:
- the light emitting amount of the first light generating unit In the first light emitting period, the second light emitting period, and the third light emitting period, the light emitting amount of the first light generating unit, the light emitting amount of the second light generating unit, and the third light emitting unit.
- a light emitting device according to a seventh aspect of the present invention, wherein control is performed such that the ratio of the amount of light emitted by the generating means to the amount of light emitted by the third light generating means is substantially the same.
- control means includes:
- control means includes:
- control is performed such that the fourth light emitting period is assigned so as to be inserted into a period after the first light emitting period, the second light emitting period, and the third light emitting period have completed one cycle.
- control means includes:
- the fourth light-emitting period is divided into the one image display period, and the first light-emitting period, the second light-emitting period, and the third light-emitting period are at least one set of light-emitting periods.
- a tenth aspect of the present invention is a light emitting device that performs control for assigning the light emitting device to be inserted into the light emitting device.
- the thirteenth invention provides a light source
- a light collection system that collects light from the light source
- Projection means for projecting light modulated by the light modulation element
- a projection display device having a light emitting device according to a seventh aspect of the present invention as the light source.
- the fourteenth invention is directed to the light emitting device according to the eighth invention.
- 3 is a program for causing a computer to function as control means for controlling light emission of the light generation means.
- a fifteenth aspect of the present invention is a recording medium recording the program of the fourteenth aspect of the present invention.
- a recording medium that can be processed by a computer.
- a light source that emits monochromatic light such as a solid-state light source, such as a light-emitting diode
- a solid-state light source such as a light-emitting diode
- FIG. 1 is a diagram showing a first example of a schematic configuration of a light emitting device according to an embodiment of the present invention and a projection display device incorporating the same.
- FIG. 2 is a diagram showing a first example of a light intensity and a time schedule of each color output from a light-emitting device incorporated in a projection display according to an embodiment of the present invention.
- FIG. 3 is a diagram showing a second example of the light intensity and the time schedule of each color output from the light emitting device built in the projection display device according to the embodiment of the present invention.
- FIG. 4 is a diagram showing a third example of the light intensity and time schedule of each color output from the light emitting device incorporated in the projection display according to the embodiment of the present invention.
- FIG. 5 is a diagram showing a fourth example of the light intensity and time schedule of each color output from the light emitting device incorporated in the projection display device according to the embodiment of the present invention.
- FIG. 6 is a diagram showing a fifth example of the light intensity and time schedule of each color output from the light emitting device incorporated in the projection display according to the embodiment of the present invention.
- FIG. 7 is a diagram showing a second example of a schematic configuration of a light emitting device incorporated in a projection display device according to an embodiment of the present invention.
- FIG. 8 is a diagram showing a first example of a schematic configuration of a conventional projection display device.
- FIG. 9 shows an example of a schematic configuration of a color wheel used in a conventional projection display device.
- FIG. 10 is a diagram showing a second example of a schematic configuration of a conventional projection display device.
- FIG. 11 shows the relationship between the light intensity of each color output from the conventional projection display device and the time schedule. Diagram showing the first example
- FIG. 12 is a diagram showing a second example of the light intensity and time schedule of each color output from the conventional projection display device.
- Blue light-emitting diode 1 An area that represents the amount of light indicated by the product of the light intensity and the lighting period during monochromatic emission 104 Area indicating the amount of light indicated by the product of the light intensity and the lighting period during simultaneous emission of three colors of red light emitting diode 1 (a)
- FIG. 1 shows a schematic configuration of a projection display device according to an embodiment of the present invention.
- FIG. 1 shows a red light emitting diode 1 (a) as a red light source, a red light lens 2 (a) for condensing a light beam emitted from the red light emitting diode 1 (a), A green light emitting diode 1 (b) as a green light source, a green light lens 2 (b) for condensing a light beam emitted from the green light emitting diode 1 (b), and a blue light emitting diode as a blue light source 1 (c), a blue light lens 2 (c) for condensing the light beam emitted from the blue light emitting diode 1 (c), and each light emitting diode 1 (a), 1 (b), 1 (c) Cross prism 3 for synthesizing light beams emitted from red light emitting diode 1 (a), green light emitting diode 1 (b), blue light emitting diode 1 (c)
- a light source unit 4 having a control means 10 for controlling the intensity, and shaping and
- a rod integrator 32 that enables highly uniform illumination, and an illumination unit 35 using a prism 36 that guides light transmitted through the lens 34 to a reflective display element 41.
- a reflective display element 41 as a light modulation element for modulating illumination light, and a projection lens 51.
- the three color light sources 1 (a), 1 (b), and 1 (c) are lighted in a time-division manner to form one screen (for example, NTSC video).
- the superimposition of the images displayed within about 17 milliseconds in the display is a color image, and the combined light of the three colors or the superimposed light becomes white.
- a light source that emits monochromatic light and has a short rise and fall time such as a solid-state laser such as an Nd: YAG laser or a gas laser such as an Ar laser, may be used.
- a solid-state light source that can be turned on and off instantaneously within a period (approximately 17 milliseconds) during which one screen is formed with a short rise and fall time, or a light source that uses another light source can be used. ,.
- FIG. 1 shows a case where luminous fluxes emitted from the light emitting diodes 1 (a), 1 (b), and 1 (c) of three primary colors are used for illumination of the reflective display element 41. Then, the light beams of the three colors condensed using the respective color lenses 2 (a), 2 (b), and 2 (c) are converted into white light that is color-combined by the cross prism 3 to the illumination unit 35. Incident on
- the light beam incident on the illumination unit 35 is condensed by the lens 31, and is made uniform by a uniform illumination means such as a glass column or a hollow cylindrical rod integrator 32 formed by diverging mirrors.
- the light is orthogonally reflected by the prism 36 and illuminates the reflective display element 41 via optical means such as.
- the light is reflected in the reflective display element 41 in a light-modulated state, passes through the prism 36, passes through the projection lens 51, and is projected on a screen (not shown). Thereby, an enlarged color image is displayed.
- the light source unit 4 and the control means 10 correspond to a configuration including the light source and the light emitting device of the present invention
- the red light emitting diode 1 (a) corresponds to the first light emitting device of the present invention
- Green light emitting diode 1 (b) corresponds to the second light generating means of the present invention
- blue light emitting diode 1 (c) corresponds to the third light generating means of the present invention
- the control means Reference numeral 10 corresponds to the control means of the present invention.
- the lenses 2 (a), 2 (b), 2 (c) for each color, the cross prism 3, and the lenses 31, 33, 34, the prism 36, and the rod integrator 32 constitute the light-collecting system of the present invention
- the pattern display element 41 corresponds to the light modulation element of the invention
- the projection lens 51 corresponds to the projection means of the invention.
- FIG. 2 shows a first example of the light intensity and time schedule of each color output from the projection display device under the control of the control means 10. As shown in FIG.
- the control means 10 divides the display period T of one image into four equal to T / 4 and divides the total of the first three periods into four equal parts of the three primary colors
- red Light-emitting diode 1 (a), blue light-emitting diode 11 (b), and green light-emitting diode 1 (c) are individually assigned to periods Rt, Gt, and Bt to emit light in a time-sharing manner.
- Wt a period Wt during which the red light emitting diode 1 (a), the blue light emitting diode 11 (b), and the green light emitting diode 1 (c) of the three primary colors are simultaneously turned on.
- the first three periods are treated as one period as a whole, and it is not necessary to light each single color in the same period.
- the single light emission period of the monochromatic light is the longest, with the single light emission period Gt of the green light emitting diode 1 (b) being T / 4 or longer, followed by the red light emitting diode 1 (
- the single light emission period Rt of a) and the single light emission period Bt of the blue light emitting diode 1 (c) are arranged in this order.
- the single light emitting period Rt of the red light emitting diode 1 (a) corresponds to the first light emitting period of the present invention
- the single light emitting period Gt of the green light emitting diode 1 (b) is
- the single light emitting period Bt of the blue light emitting diode 1 (b) corresponds to the second light emitting period of the present invention, and corresponds to the third light emitting period of the present invention. This correspondence is common to the following embodiments.
- the red light emitting diode 1 (a), the blue light emitting diode 11 (b), and the green light emitting diode 1 (c) of the three primary colors simultaneously emit light. Will emit mixed white light. Therefore, for the entire one-screen display period, red, green, and blue monochromatic light and white light are projected in a time-division manner.
- the simultaneous light emitting period Wt of the red light emitting diode 1 (a), the green light emitting diode 1 (b) and the blue light emitting diode 1 (b) corresponds to a fourth light emitting period of the present invention. This correspondence is common to the following embodiments.
- each single color light is used alone.
- the light emission period was changed so that the single light emission period of the green light emitting diode was set to be the longest.However, in order to obtain a higher amount of light, the light emission was longer than the predetermined green light emission diode emission period for obtaining appropriate white light. If light is emitted during the period, the effect of green color on white light increases, and color reproducibility deteriorates.
- the simultaneous light emission period Wt in which the mixed white light is superimposed is provided.
- the light intensity of each light emitting diode is different between the case where each light emitting diode emits light alone and the case where three colors emit light simultaneously. For the first time, even if the lighting period of the green light emitting diode is prolonged, it is possible to increase the brightness while maintaining a white color with high color reproducibility. This will be described below.
- the amount of light when emitted in a single color based on the display period ⁇ of one image is 44 lumens in red light emitting diode 1 (a), 80 lumens in green light emitting diode 1 (b), and 80 lumens in blue light emitting diode 1 (c) Assuming 18 lumens, if the lighting period of each light emitting diode is assumed to be equal to T / 4, the brightness of each color will be 11 lumens for red, 20 lumens for green, and 4.5 lumens for blue.
- red: green: blue 3: 7: 1
- This light amount ratio is shown as an area ratio of the regions 101, 102 and 103 in the figure.
- the light amount in the single light emitting periods Rt, Gt, and Bt is emitted in a state where the light intensity of each single color is maximized, and the period during which each single color light emitting diode emits light is adjusted. As a result, a desired color balance and maximum brightness can be obtained. This is the same control as in the conventional example of FIG.
- each monochromatic light emitting diode When the light is emitted at the maximum light intensity, the ratio of the three colors in the mixed white light is the maximum output of each single color: 44 lumens for red, 80 lumens for green, and 18 lumens for blue.
- the light intensity of the green light emitting diode 1 (b) is used as the light intensity of the red light emitting diode 1 (a).
- the light intensity of blue light emitting diode 1 (c) dropped to 77.9%, the maximum light intensity of 63.5.
- the light amount ratio of each light emitting diode during the simultaneous light emitting period Wt and the light amount ratio of each light emitting diode during the single light emitting period Rt, Gt, and Bt have substantially the same value, and a high color reproducibility is obtained.
- White light can be obtained.
- the light amount ratio during the simultaneous light emission period Wt is shown as an area ratio of the regions 104, 105, and 106 in the figure.
- the red light emitting diode 1 (a), the green light emitting diode 1 (b), and the blue light emitting diode 1 (c) are set within the display period T of one image.
- a period Rt, Gt, Bt for emitting light in a single color and a period Wt for emitting light in three colors at the same time are allotted.
- the light emitting ratio Rt, Gt, Bt, and the period Wt for emitting light in three colors simultaneously By adjusting each light emission period during the monochromatic single light emission period and adjusting each light intensity during the simultaneous light emission period so as to be substantially the same, the white color with high color reproducibility is maintained. The effect that it can be made bright is obtained.
- the display period T of one image is divided into four equal parts, the first 3T / 4 is allocated to the light emission period for each monochromatic light, and the remaining TZ4s emit three colors simultaneously.
- the allocation is made to the period, the allocation of the time between the emission period of the monochromatic light and the emission period of the three colors simultaneously, which does not need to be particularly allocated, may be arbitrarily changed.
- FIG. 3 shows that the three-color simultaneous emission period Rt, Gt, and Bt for projecting mixed white light is increased to half of the display period T of one image, and the remaining half period is changed to a single color. This is an example in which a light emission period Wt for light display is assigned.
- the light amount ratio of each monochromatic light indicated by the area ratio of the regions 111, 112 and 113, and the light amount ratio of each monochromatic light in the mixed white light indicated by the area ratio of the regions 114, 115 and 116 are substantially the same, and it is possible to provide a projection display device capable of projecting an image having an extremely large white peak output while maintaining high color reproducibility. .
- FIG. 4 shows the light emission periods Rt, Gt, and Bt for the monochromatic light display in the display period of one image.
- the order of light emission of each light emitting diode within the display period T of one image is determined by the single light emission of the red light emitting diode 1 (a) and the green light emission.
- the order of the light emission of the photodiode 1 (b) alone, the emission of the blue light emitting diode 1 (c) alone, and the simultaneous emission of three colors is not limited to this.
- the four types of light emitting diode lighting control may be performed in any order as long as the above four types of light emitting diode lighting control are performed at the adjusted light emitting period and light intensity within the display period T of one image.
- the three-color simultaneous light-emission period is divided into three equal parts, so that the red light-emitting diode 1 (a) has a single light-emission period and the green light-emitting diode 1 (b) has a single light-emission period.
- the amount of each monochromatic light indicated by the area ratio of the regions 131, 132 and 133 in the figure and the regions ((134a + 134b + 134c), (135a + 135b + 135c) and (136a + 136b + 136c) is substantially the same as the light amount ratio of each monochromatic light in the mixed white light indicated by the area ratio.
- the three-color simultaneous emission period may be divided into four equal parts or more. Further, the single light emitting period of the red light emitting diode 1 (a), the single light emitting period of the green light emitting diode 1 (b), and the single light emitting period of the blue light emitting diode 1 (c) may be divided into two or more. FIG. 1
- FIG. 6 shows an example in which the display period T of one image is divided into three.
- a display period T / 3 in which the display period T of one image is divided into three, a single light emitting period of the red light emitting diode 1 (a) and a green light emitting diode 1 (b), The single light emitting period and the three color simultaneous light emitting period of the diode 1 (c) are completed, and the completed cycle 600 is repeated three times within the display period T of the screen.
- each single color of the single light emission period within the display period T of one image represented by the area ratio of the regions (101a + 101b + 101c), (102a + 102b + 102c) and (103a + 103b + 103c) is shown.
- the light intensity ratio is kept substantially the same. Further, it is preferable that the light quantity ratio of each single color light in the single light emission period in each cycle 600 and the light quantity ratio of each single color light in the three color simultaneous light emission period in each cycle 600 are substantially the same. In FIG.
- the area S of the areas 101a, 102a, and 103a and the area of the areas 104a, 105a, and 106a]; and the force S are substantially the same, and the area of the areas 101b, 102b, and 103b]; It is preferable that the area ratio of the areas 104b, 105b, and 106b is substantially the same, and the area ratio of the areas 101c, 102c, and 103c is substantially the same as the area ratio of the areas 104c, 105c, and 106c.
- the light amount ratio of each monochromatic light in the single light emission period in all the cycles 600 in one image display period T and the three colors in all the cycles 600 in one image display period T The light intensity ratio of each monochromatic light during the simultaneous light emission period is substantially the same.
- the area ratio of the areas 101a, 102a, 103a, the area of the areas 104a, 105a, 106a]; the area of the areas 101b, 102b, 103b, the area of the areas 104b, 105b, 106b]; Dani, areas 101c, 102c, 103c]; dani, areas 104c, 105c, 106c (preferably, the volume ratios are substantially the same.
- the division of the single light emission period of each monochromatic light, the division of the three-color simultaneous emission period, and the division into each cycle are not equally divided but equally divided, and the respective divided periods have different lengths. You may.
- the individual light emitting periods may be continuously or discontinuously (equally divided or unequally divided) as long as the simultaneous light emitting periods of the three light emitting diodes are performed. .
- the light amount of the light emitting diode of a color whose brightness is insufficient to realize high color reproducibility at the time of color synthesis may be set to a light amount ratio that is larger than the light amount of the light emitting diode of another color.
- the light amount ratio of the monochromatic light in the mixed white light may be arbitrarily changed to such an extent that the light amount of the code 1 (b) is maintained at the maximum.
- all the light emitting diodes emit light at the maximum light intensity within the light emitting diode single light emitting period.
- the present invention is not limited to the light emitting diode single light emitting period.
- the respective light intensities may be changed.
- the light amount ratio in the light emitting period of each light emitting diode alone and the light amount ratio in the mixed white light may be arbitrarily set.
- the red light emitting diode 1 (a), the green light emitting diode 1 (b), and the blue light emitting At least one of the light emission periods of diode 1 (c) is made different from the others, and red light emission diode 1 (a), green light emission diode 1 (b) and green light emission diode 1 (c) emit light simultaneously.
- a period may be assigned.
- the adjustment of the light emission period and the adjustment of the light intensity in the light emission period of each light emitting diode alone may be performed at the same temple, or both.
- the green light output is higher than the ratio of red, green, and blue in a well-balanced manner to obtain appropriate white.
- the method of controlling light emission in a small number of situations has been shown, when using products with different luminous efficiencies and inputtable power, or products other than Lumileds in the United States, the amount of red and blue light balances the appropriate white light. Since the ratio becomes smaller with respect to the ratio of good red, green, and blue colors, a light source other than green may emit light at the maximum light intensity.
- FIG. 1 as the illumination unit 35, a force is shown in which the three lenses 31, 33, and 34, the rod integrator 32, and the prism 36 are shown.
- a lens is shown in the optical path and a prism for bending the optical path is shown as an optical means for converting illumination light having a shape and uniformity according to the size to be illuminated on the reflective display element 41 to be illuminated.
- a system may be implemented as the light collection system of the present invention.
- the light emitted from the light emitting diodes 1 (a) -1 (c) of three colors and condensed by the lenses 2 (a) -2 (c) is subjected to color synthesis by the cross prism 3.
- the light source unit 4 is described, the light emitting device of the present invention may be configured to combine light beams of respective colors by a color filter such as a dichroic mirror.
- a cycle of single light emission of the red light emitting diode 1 (a), a single light emission of the green light emitting diode 1 (b), a single light emission of the blue light emitting diode 1 (c), and a simultaneous light emitting cycle of each light emitting diode are assigned.
- the display period of one image is set to about 17 milliseconds of one screen display period of NTSC video display, but may be the display period of one image of PAL or another video signal. That is, as long as the above-mentioned respective periods are assigned within the period in which the reflective display element 41 displays one screen, the display period of one image may be any length.
- a light emitting diode is used as a light generating means for emitting monochromatic light, and to obtain white light, light emitted from three types of light emitting diodes of red, green and blue is used.
- white light emits light with a wavelength close to or within the range of ultraviolet light, and when light of that wavelength enters, it is emitted light from phosphors that fluoresce red, green, and blue. May be.
- a configuration may be adopted in which light of four or more colors is synthesized, not only three colors of red, green, and blue, such as red, yellow, green, blue-green, and blue.
- the power is a configuration using a rod integrator 32 as an optical means for enabling uniform illumination of the illumination unit 35.
- a plurality of lenses are arranged two-dimensionally.
- a configuration using the first lens array 301 and the second lens array 302 may be used.
- the reflection type display element 41 is used as the image display element, but the reflection direction can be changed by a transmission type display element or a micro mirror arranged in an array. (A digital micromirror device) or a projection display device having a display element such as a liquid crystal as the light modulation element of the present invention.
- the light-emitting diodes 1 as solid-state light sources are described in a minimum number of one for each single color, but the number is particularly limited to one for each single color.
- the light generating means may be configured using a plurality of light emitting diodes.
- the program working on the present invention is a program for causing a computer to execute all or a part of the functions of the above-described light emitting device control means 10 of the present invention, and cooperates with the computer. It may be an operating program.
- the present invention is a medium in which a program for causing a computer to execute all or a part of the functions of the control means 10 of the present invention described above is recorded, and is readable and readable by a computer.
- the program may be a medium that executes the function in cooperation with the computer.
- the present invention also includes a computer-readable recording medium on which the program of the present invention is recorded.
- One use form of the program of the present invention may be a form in which the program is recorded on a computer-readable recording medium and operates in cooperation with the computer.
- One use form of the program of the present invention may be a form in which the program is transmitted through a transmission medium, read by a computer, and operates in cooperation with the computer.
- the data structure of the present invention includes a database, a data format, a data table, a data list, a type of data, and the like.
- the recording medium includes a ROM and the like, and the transmission medium includes a transmission mechanism such as the Internet, light, radio waves, and sound waves.
- the computer of the present invention described above is not limited to pure hardware such as a CPU, but may include firmware, a computer, and peripheral devices.
- the configuration of the present invention may be realized by software or hardware.
- the light emitting device and the projection display device according to the present invention use a light source that emits monochromatic light typified by a solid-state light source such as a light emitting diode, and are required to have a high light use efficiency.
- the present invention can be applied to a display device capable of projecting an image, such as a display device.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Projection Apparatus (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Description
Claims
Priority Applications (2)
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US10/587,751 US7607784B2 (en) | 2004-01-28 | 2005-01-27 | Light emission method, light emitting apparatus and projection display apparatus |
JP2005517492A JP4546930B2 (ja) | 2004-01-28 | 2005-01-27 | 発光方法、発光装置、投写型表示装置 |
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JP2004019586 | 2004-01-28 | ||
JP2004-019586 | 2004-01-28 |
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PCT/JP2005/001138 WO2005073952A1 (ja) | 2004-01-28 | 2005-01-27 | 発光方法、発光装置、投写型表示装置 |
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US (1) | US7607784B2 (ja) |
JP (1) | JP4546930B2 (ja) |
CN (1) | CN100489952C (ja) |
WO (1) | WO2005073952A1 (ja) |
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Also Published As
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CN1771530A (zh) | 2006-05-10 |
JP4546930B2 (ja) | 2010-09-22 |
US7607784B2 (en) | 2009-10-27 |
CN100489952C (zh) | 2009-05-20 |
US20070127237A1 (en) | 2007-06-07 |
JPWO2005073952A1 (ja) | 2007-09-13 |
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