WO2020052227A1 - Appareil de projection, et procédé de préréglage de balance des blancs et procédé de réalisation - Google Patents

Appareil de projection, et procédé de préréglage de balance des blancs et procédé de réalisation Download PDF

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Publication number
WO2020052227A1
WO2020052227A1 PCT/CN2019/081642 CN2019081642W WO2020052227A1 WO 2020052227 A1 WO2020052227 A1 WO 2020052227A1 CN 2019081642 W CN2019081642 W CN 2019081642W WO 2020052227 A1 WO2020052227 A1 WO 2020052227A1
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Prior art keywords
color
fluorescence
light
light source
wavelength conversion
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PCT/CN2019/081642
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English (en)
Chinese (zh)
Inventor
余新
胡飞
李屹
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深圳光峰科技股份有限公司
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Publication of WO2020052227A1 publication Critical patent/WO2020052227A1/fr

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/206—Control of light source other than position or intensity
    • 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
    • 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
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3155—Modulator illumination systems for controlling the light source
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut

Definitions

  • the present invention relates to the field of projection technology, and in particular, to a projection device.
  • the primary color light of the light source (such as red, green, and blue three primary color lights) will undergo a proportional change under the original white balance conditions As a result, the white balance changes, the color temperature shifts, and the image screen is discolored, which reduces the quality of the projected image.
  • the present invention provides a projection device capable of solving the above problems.
  • An embodiment of the present invention provides a projection device, including: a light source for emitting an excitation light; a wavelength conversion device having a plurality of color segments and rotating according to a preset period; The rotation of the wavelength conversion device sequentially receives the excitation light to generate at least three primary colors of light in sequence, the three primary colors of light include fluorescence; a light source driving circuit electrically connected to the light source, and the light source driving circuit is used for Providing a driving current to the light source; and a memory for storing a one-to-one correspondence between the brightness of each color of fluorescence, the intensity of the excitation light, and the current value of the driving current, wherein the light source driving circuit is based on each The brightness required for color fluorescence and the one-to-one correspondence determine the corresponding current value, and the driving current is provided to the light source according to the determined current value, so that the excitation light emitted by the light source passes through the corresponding wavelength conversion device.
  • the fluorescence of that color produced after the color segment has the
  • An embodiment of the present invention also provides a method for presetting a white balance, which is applied to a projection device.
  • the projection device includes a light source, a wavelength conversion device, a light source driving circuit, and a memory.
  • Excitation light the wavelength conversion device has a plurality of color sections, and the color sections sequentially receive the excitation light as the wavelength conversion device rotates to generate at least three primary color lights in a time sequence, the three primary color lights
  • the light source driving circuit is configured to provide a driving current to the light source
  • the preset method of the white balance includes: pre-calibrating a relationship between a light intensity of the excitation light and a current value of the driving current; The relationship between the brightness of the fluorescence of each color and the intensity of the excitation light is calibrated in advance to obtain the fluorescence efficiency curve of the fluorescence of each color; according to the relationship between the intensity of the excitation light and the current value of the driving current and the fluorescence efficiency of each color of fluorescence The curve establishes a
  • An embodiment of the present invention also provides a method for realizing white balance, which is applied to a projection device.
  • the projection device includes a light source, a wavelength conversion device, a light source driving circuit, and a memory.
  • the light source is used to emit an excitation.
  • the wavelength conversion device has a plurality of color sections, and the color sections sequentially receive the excitation light to generate at least three primary color lights with the rotation of the wavelength conversion device, and the three primary light includes Fluorescence
  • the light source driving circuit is configured to provide a driving current to the light source
  • the method for realizing the white balance includes: the light source driving circuit reads the brightness of each color of fluorescence stored in the memory, and the light of the excitation light A one-to-one correspondence between the strong and current values of the driving current; the light source driving circuit determines the corresponding current value according to the brightness required for each color fluorescence and the one-to-one correspondence; and the light source driving circuit according to the The determined current value provides a driving current to the light source, so that the excitation light emitted by the light source passes through the corresponding wavelength conversion device.
  • the fluorescence of that color produced after the color segment has the required brightness.
  • the light source driving circuit may set a current value of the driving current according to actual needs, so that the excitation light is incident on different color sections of the wavelength conversion device with preset different light intensities, Therefore, the brightness of the output fluorescence of each color can be adjusted, which is beneficial to achieve white balance.
  • the relationship between the intensity of the excitation light and the current value of the driving current and the fluorescence efficiency curve of each color of fluorescence are calibrated in advance through experiments.
  • a one-to-one correspondence between the brightness of the fluorescence of each color, the intensity of the excitation light, and the current value of the driving current is established in advance, and the light source driving circuit sets the current value of the driving current according to the one-to-one correspondence so that the wavelength The conversion device accurately outputs fluorescence of different brightness.
  • FIG. 1 is a schematic structural diagram of a projection device according to a preferred embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a wavelength conversion device of the projection apparatus shown in FIG. 1.
  • FIG. 3 is a relationship diagram between the light intensity of the excitation light and the current value of the driving current.
  • FIG. 4 is a graph showing the fluorescence efficiency curve of each color fluorescence.
  • FIG. 5 is a relationship diagram between a video frame and a sub-frame, and a sub-frame and a displayed color.
  • FIG. 6 is a flowchart of a method for presetting white balance according to a preferred embodiment of the present invention.
  • FIG. 7 is a flowchart of a method for implementing white balance according to a preferred embodiment of the present invention.
  • Wavelength conversion device 10 Wavelength conversion device 20 Collection lens 30 Beamsplitter 40 Spatial light modulator 50 Projection lens 60 Light source driving circuit 70 Memory 80 Temperature Sensor 81 Projection device 100 First color segment 201 Second color segment 202 Third color segment 203 Fourth color segment 204 Video one frame A, A1 Sub-frame a, a0 ⁇ a7
  • a projection apparatus 100 provided by a preferred embodiment of the present invention includes a light source 10, a wavelength conversion device 20, a collection lens 30, a beam splitter 40, a spatial light modulator 50, a projection lens 60 and A light source driving circuit 70.
  • the light source 10 is used to emit an excitation light having a specific band of light.
  • the light source 10 is a blue light source (for example, a blue LED or a blue laser diode), and the excitation light emitted by the light source 10 is blue light. More specifically, the excitation light emitted by the light source 10 is a blue laser.
  • a scattering element such as a scattering plate, not shown may be disposed on the light source 10 to avoid the occurrence of laser speckle.
  • the wavelength conversion device 20 has a plurality of color segments and rotates according to a preset period.
  • the color section sequentially receives the excitation light as the wavelength conversion device 20 rotates to generate at least three primary color lights in a time series.
  • the three primary colors of light include fluorescent light and scattered light.
  • the color section of the wavelength conversion device 20 includes a first color section 201, a second color section 202, and a third color section 203 in this order along the rotation direction of the wavelength conversion device 20.
  • the first color section 201 and the second color section 202 include a first color phosphor and a second color phosphor, respectively.
  • the first color phosphor includes a red phosphor, which is receiving the The blue light is excited to generate red fluorescence; the second color phosphor includes a green phosphor, which is excited to generate green fluorescence after receiving the blue light.
  • the third color section 203 is a light-transmitting area or a reflection area, which is used to transmit or reflect the blue light.
  • a scattering material may be further disposed on the third color section 203 for decoherence of the blue light.
  • the red, green, and blue scattered lights emitted in time sequence are the three primary colors of light.
  • each color segment of the wavelength conversion device may further include an adhesive for encapsulating the fluorescence.
  • the adhesive may be resin, silica gel, water glass, glass, or ceramic. Etc. Among them, when glass or ceramic is used as the packaging material of the phosphor, the prepared wavelength conversion is also called fluorescent glass or fluorescent ceramic. Specifically, the ceramic material may be selected from at least one of alumina, aluminum oxynitride, and magnesium aluminum spinel.
  • the wavelength conversion device further includes a substrate for carrying a phosphor, and the substrate may be any combination of a reflective substrate and a transmissive substrate. According to different substrates, it can be divided into a transmissive fluorescent color wheel and a reflective fluorescent color wheel.
  • the wavelength conversion device 20 may be a transmissive fluorescent color wheel, which is formed by coating different transparent phosphors on a transparent substrate.
  • the wavelength conversion device 20 may also be a reflective fluorescent color wheel, which is formed by coating a metal substrate or an optical reflective substrate with phosphors of different colors.
  • a focusing lens (not shown) and a collimating lens (not shown) may be further disposed between the light source 10 and the wavelength conversion device 20 in order. For the excitation light, the collimating lens is used to collimate the focused excitation light up to the wavelength conversion device 20.
  • the collection lens 30 is used to collect the three primary colors of light.
  • the beam splitter 40 is configured to reflect the three primary colors of light to the spatial light modulator 50.
  • the beam splitter 40 is a polarizing beam splitter (PBS, Polarizing Beam Splitter), and is configured to reflect incident light having a first polarization state among the three primary colors of light to the spatial light modulator 50.
  • PBS Polarizing Beam Splitter
  • the spatial light modulator 50 is configured to modulate incident light to obtain corresponding image light, and reflect the image light to the beam splitter 40. Therefore, the beam splitter 40 transmits the image light to the projection lens 60 to output a monochrome image, and the output monochrome image forms a color image through the integration effect of the human eye.
  • the spatial light modulator 50 modulates the incident light so that a first polarization state thereof is deflected by 90 degrees (that is, modulated to a second polarization state), and the modulated image light is modulated. Reflected to the beam splitter 40.
  • the first polarization state and the second polarization state are perpendicular to each other.
  • the color segment of the wavelength conversion device 20 further includes a fourth color segment 204.
  • the fourth color segment 204 includes a third color phosphor, such as the third color phosphor.
  • the powder includes a yellow phosphor, which is excited to generate yellow fluorescence after receiving the blue light. The yellow fluorescence is used to compensate the brightness of the output image.
  • the light source driving circuit 70 is electrically connected to the light source 10.
  • the light source driving circuit 70 is configured to provide a driving current to the light source 10 and set a current value of the driving current according to an actual need, thereby changing an intensity of the excitation light emitted by the light source 10. Therefore, after the excitation light passes through the wavelength conversion device 20, the brightness of each color of fluorescence (including red fluorescence, green fluorescence, and yellow fluorescence) generated in time sequence is adjustable, thereby achieving white balance at high brightness.
  • FIG. 3 is a relationship diagram between the light intensity of the excitation light and the current value of the driving current. It can be known from FIG. 3 that within a certain range, the light intensity of the excitation light is proportional to the current value of the driving current. As the current value of the driving current increases, the light intensity of the excitation light is linear. Increase. Therefore, the relationship between the intensity of the excitation light and the current value of the driving current can be calibrated in advance through experiments.
  • FIG. 4 is a graph showing the fluorescence efficiency curve of each color of fluorescence.
  • the overall relationship between the brightness of the fluorescence of each color and the intensity of the excitation light is nonlinear.
  • the fluorescence conversion efficiency is higher, and the brightness of the red fluorescence, the green fluorescence, and the yellow fluorescence increases linearly; as the intensity of the excitation light continues to increase, as the phosphor reaches thermal saturation And light saturation, the fluorescence excitation efficiency gradually decreases, causing the brightness of red, green, and yellow fluorescence to increase non-linearly; as the intensity of the excitation light continues to increase, the brightness of red, green, and yellow fluorescence gradually decreases. Therefore, the fluorescence efficiency curve of each color fluorescence can be calibrated in advance through experiments.
  • each brightness of each color fluorescence corresponds to a light intensity of the excitation light and a current value of the driving current.
  • a specific color fluorescence has a certain brightness L0, which corresponds to the light intensity of the excitation light M0, and the light intensity M0 of the excitation light corresponds to the current value I0 of the driving current; according to this one-to-one correspondence
  • the current value of the driving current is I0
  • the brightness of the fluorescence of the specific color is L0.
  • the light source driving circuit 70 determines a corresponding current value according to the brightness required for each color of fluorescence and the one-to-one correspondence relationship, and provides a driving current to the light source 10 according to the determined current value, so that the light source 10 emits
  • the fluorescence of the color generated after the excitation light passes through the corresponding color segment of the wavelength conversion device 20 has the required brightness, so that the brightness of the fluorescence of each color generated in time sequence can be adjusted to achieve white balance.
  • the one-to-one correspondence is stored in a memory 80 of the projection apparatus 100.
  • the fluorescence conversion efficiency needs to further refer to the temperature value of the wavelength conversion device 20. Therefore, in another In one embodiment, at this time, the fluorescence efficiency curves of the fluorescence of each color at different temperature values within a preset temperature range of the wavelength conversion device can be calibrated in advance through experiments, so that the brightness of each color of fluorescence, the intensity of the excitation light, A one-to-one correspondence between the temperature value of the wavelength conversion device and the current value of the driving current.
  • each brightness of each color fluorescence corresponds to the excitation light.
  • the projection apparatus 100 further includes a temperature sensor 81.
  • the temperature sensor 81 may be disposed adjacent to the wavelength conversion device 20 or disposed on the wavelength conversion device 20 to sense a temperature value of the wavelength conversion device 20.
  • the light source driving circuit 70 obtains the temperature value sensed by the temperature sensor 81, and determines a corresponding current value according to the temperature value, the brightness required for the fluorescence of each color, and the one-to-one correspondence, and then according to the The determined current value provides a driving current to the light source 10 so as to dynamically achieve a projected white balance output at different ambient temperatures.
  • the preset temperature range is -30 ° C to 150 ° C.
  • the preset temperature range is -5 ° C to 100 ° C. More preferably, the preset temperature range is 5 ° C to 70 ° C.
  • the temperature sensed by the temperature sensor 81 will be different; for example, at the excitation position of the fluorescent color wheel, the temperature It will be higher than other positions.
  • the proximity between the temperature sensor 81 and the wavelength conversion device 20 also affects the specific value range detected by the temperature sensor 81. Therefore, it can be understood that the temperature value of the wavelength conversion device 20 may be a temperature value within the range of the wavelength conversion device 20 and its vicinity.
  • the spatial light modulator 50 is a silicon-based liquid crystal chip (ie, LCOS chip, Liquid Crystal), that is, the projection device 100 is a single-chip silicon-based liquid crystal projection device.
  • the LCoS chip modulates the incident light.
  • the LCOS chip is a driver chip manufactured by a semiconductor process, and then polished using a polishing technique on a transistor, and plated with aluminum or silver as a mirror to form a CMOS substrate.
  • the CMOS substrate and glass containing a transparent electrode are then used. Liquid crystal molecules are poured into the substrate after the substrate is fully attached and obtained by packaging and testing.
  • the LCOS chip may modulate the incident light and add spatial information to the incident light by controlling a polarization state.
  • the spatial information may be a control signal voltage loaded on the LCOS chip.
  • the control signal voltage directly controls a switching state of a thin film transistor, and then uses the thin film transistor to control a deflection state of the liquid crystal molecules, and the liquid crystal molecules have Obvious optical anisotropy can control the incident light to achieve the purpose of loading an image signal for the incident light.
  • the LCOS chip can modulate incident light with an S polarization state and load spatial information, and reflect the modulated image light with a P polarization state and load the spatial information to the beam splitter 40.
  • the modulation process of the incident light by the LCOS chip is completed within the duration of one frame, and each frame contains multiple subframes of equal duration, and the LCoS chip receives only a single within the duration of each subframe Color of incident light.
  • the video is composed of multiple video frames A.
  • a video frame A1 contains only eight sub-frames a (ie, sub-frames a0 to a7 shown in the figure) of equal duration.
  • Each sub-frame a can only display a single color. For example, sub-frames a0 to a2 are displayed in red. Sub-frames a3 to a4 are displayed in green, sub-frame a5 is displayed in blue, and sub-frames a6 to a7 are displayed in yellow.
  • the wavelength conversion device 20 rotates n cycles (n ⁇ 1, n is a natural number) corresponding to one frame A1 of the video, that is, the wavelength conversion device 20 can rotate n during the duration of the one frame A1 of the video. week.
  • the color segments of the wavelength conversion device 20 correspond to subframes a0 to a7 in sequence during the rotation, and the colors of the fluorescence generated by the color segments of the wavelength conversion device 20 in sequence during the rotation are in accordance with the subframes a0 to a7.
  • the displayed colors correspond.
  • the wavelength conversion device 20 is respectively provided as a first color section 201, a second color section 202, a third color section 203, and a fourth color section 204 along its circumferential direction.
  • the first color section 201 occupies 3/8 of the area of the wavelength conversion device 20 and is used to excite red fluorescence, corresponding to subframes a0 to a2; the second color section occupies 1/4 of the area of the wavelength conversion device 20 and is used for For exciting green fluorescence, it corresponds to subframes a3 to a4; the third color segment occupies 1/8 of the area of the wavelength conversion device 20 and is used to transmit or reflect blue light, corresponding to subframe a5; the fourth color segment occupies The area of the wavelength conversion device 20 is 1/4 and is used to excite yellow fluorescence, corresponding to the subframes a6 to a7.
  • the time for the wavelength conversion device 20 to output a single color of fluorescence is limited (that is, the output time of a single color of fluorescence is an integer multiple of the duration of the subframe), which results in a smaller number of subframes (see FIG. 5
  • the frame A1 of the video shown in the figure includes only 8 sub-frames a0 to a7) and when high-brightness display is performed, the phenomenon of white balance imbalance tends to occur.
  • the luminance ratio of each primary color in the output RGB three primary color light is fixed.
  • the spatial light modulator is an LCOS chip
  • the corresponding Sub-frame a displays this color and has the required brightness, so that each frame achieves white balance.
  • the wavelength conversion device 20 is rotated to the first color section (ie, the red phosphor region) to receive the excitation light
  • the current value of the driving current is increased to make the excited red fluorescence
  • the brightness is increased, so that the brightness displayed in the sub-frames a0 to a2 is correspondingly enhanced.
  • the wavelength conversion device 20 When the wavelength conversion device 20 is rotated to the third color section 203 (ie, the blue light reflection area) to receive the excitation light, it maintains or Reducing the current value of the driving current to maintain or reduce the brightness of the reflected blue light, so as to maintain the brightness displayed in the sub-frame a5 or reduce the brightness displayed in the sub-frame a5, so as to achieve white balance in one frame A1 of the video.
  • the third color section 203 ie, the blue light reflection area
  • a preferred embodiment of the present invention further provides a preset method for white balance applied to the projection apparatus 100.
  • the order of the steps of the preset method of white balance may be changed, and some steps may be omitted or combined.
  • the preset method of the white balance includes:
  • Step S61 Pre-calibrate a relationship between a light intensity of the excitation light and a current value of the driving current.
  • the light intensity of the excitation light is proportional to the current value of the driving current. As the current value of the driving current increases, the light intensity of the excitation light linearly increases.
  • step S62 the relationship between the brightness of the fluorescence of each color and the light intensity of the excitation light is calibrated in advance to obtain a fluorescence efficiency curve of the fluorescence of each color.
  • Step S63 According to the relationship between the intensity of the excitation light and the current value of the driving current and the fluorescence efficiency curve of the fluorescence of each color, one of the brightness of the fluorescence of each color, the intensity of the excitation light, and the current value of the driving current is established in advance.
  • a correspondence relationship In the one-to-one correspondence, each brightness of each color fluorescence corresponds to a light intensity of the excitation light and a current value of the driving current.
  • Step S64 The one-to-one correspondence is stored in the memory 80, so that the light source driving circuit 70 can determine the corresponding current value according to the brightness required for each color fluorescence and the one-to-one correspondence, and according to The determined current value provides a driving current to the light source 10, so that the fluorescence of the color generated by the excitation light emitted by the light source 10 after passing through the corresponding color segment of the wavelength conversion device 20 has the required brightness, so that The brightness of the fluorescence of each color generated by the timing is adjustable to achieve white balance.
  • the temperature conversion value of the wavelength conversion device 20 needs to be further referred to.
  • step S62 "pre-calibrating the relationship between the brightness of the fluorescence of each color and the intensity of the excitation light” is more specifically: pre-calibrating different temperature values within a preset temperature range of the wavelength conversion device
  • the relationship between the brightness of the lower color fluorescence and the light intensity of the excitation light makes the one-to-one correspondence also include different temperature values within a preset temperature range of the wavelength conversion device.
  • each brightness of each color fluorescence corresponds to a light intensity of the excitation light and a current value of the driving current.
  • the light source driving circuit 70 obtains the temperature value of the wavelength conversion device of the wavelength conversion device 20 sensed by the temperature sensor 81, and according to the temperature value, the brightness required for each color fluorescence And the one-to-one correspondence relationship determines a corresponding current value, and then provides a driving current to the light source 10 according to the determined current value, so as to dynamically realize a projected white balance output at different ambient temperatures.
  • the preset temperature range is -30 ° C to 150 ° C.
  • the preset temperature range is -5 ° C to 100 ° C. More preferably, the preset temperature range is 5 ° C to 70 ° C.
  • a preferred embodiment of the present invention further provides a method for implementing white balance applied to the projection apparatus 100.
  • the order of steps of the method for implementing white balance may be changed, and some steps may be omitted or combined.
  • the method for implementing the white balance includes:
  • Step S71 The light source driving circuit 70 reads the one-to-one correspondence between the brightness of each color of fluorescence, the intensity of the excitation light, and the current value of the driving current stored in the memory 80.
  • each brightness of each color fluorescence corresponds to a light intensity of the excitation light and a current value of the driving current.
  • Step S72 The light source driving circuit 70 determines a corresponding current value according to the brightness required for each color fluorescence and the one-to-one correspondence.
  • Step S73 The light source driving circuit 70 provides a driving current to the light source 10 according to the determined current value, so that the excitation light emitted by the light source 10 passes through the corresponding color segment of the wavelength conversion device 20 and generates the color.
  • the fluorescent light has the required brightness, so that the brightness of each color of the fluorescence generated in the time sequence can be adjusted to achieve white balance.
  • the light source driving circuit 70 can set the current value of the driving current according to actual needs, so that the excitation light is incident on different color sections of the wavelength conversion device 20 with different preset light intensities. Therefore, the brightness of the output fluorescence of each color can be adjusted, which is beneficial to achieve white balance. Furthermore, the relationship between the intensity of the excitation light and the current value of the driving current and the fluorescence efficiency curve of the fluorescence of each color are calibrated in advance through experiments to establish the brightness of the fluorescence of each color, the intensity of the excitation light, and the current of the driving current in advance.
  • the light source driving circuit 70 sets the current value of the driving current according to the one-to-one correspondence, so that the wavelength conversion device 20 accurately outputs fluorescence with different brightness.
  • the fluorescence efficiency curve of each color fluorescence at different temperature values of the wavelength conversion device can be calibrated in advance.
  • the light source driving circuit 70 looks up the table in the memory 80 according to the current temperature value of the wavelength conversion device 20 and the wavelength conversion device. The corresponding current value is determined to dynamically realize the projected white balance output under different ambient temperatures.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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  • Projection Apparatus (AREA)

Abstract

Appareil de projection (100), comprenant : une source de lumière (10) destinée à émettre une lumière d'excitation ; un dispositif de conversion de longueur d'onde (20) ayant de multiples segments de couleur, les segments de couleur recevant la lumière d'excitation en séquence avec la rotation du dispositif de conversion de longueur d'onde (20) de manière à générer une lumière à trois luminophores dans une séquence de synchronisation, et la lumière à trois luminophores comprenant une fluorescence ; un circuit d'attaque (70) de source de lumière pour fournir un courant d'attaque pour la source de lumière ; et une mémoire (80) destinée à stocker une corrélation univoque entre la luminosité de fluorescence dans chaque couleur, l'intensité lumineuse de la lumière d'excitation et une valeur de courant du courant d'attaque, le circuit d'attaque (70) de source de lumière déterminant une valeur de courant correspondante en fonction de la luminosité requise par la fluorescence dans chaque couleur et de la corrélation univoque, et fournit un courant d'attaque pour la source de lumière (10) en fonction de la valeur de courant déterminée, de telle sorte que la fluorescence dans la couleur, qui est générée à partir d'une lumière d'excitation traversant un segment de couleur correspondant, a la luminosité requise, et la luminosité de la fluorescence dans chaque couleur, qui est générée dans la séquence de synchronisation, est ajustable pour réaliser une balance des blancs. De plus, l'invention concerne en outre un procédé de préréglage de balance des blancs et un procédé de réalisation.
PCT/CN2019/081642 2018-09-10 2019-04-08 Appareil de projection, et procédé de préréglage de balance des blancs et procédé de réalisation WO2020052227A1 (fr)

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CN113873212B (zh) * 2021-12-02 2022-03-08 深圳市爱图仕影像器材有限公司 一种合光方法、智能终端及存储介质

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CN103140000A (zh) * 2007-09-28 2013-06-05 精工爱普生株式会社 光源装置及投影机
US20140071408A1 (en) * 2012-09-12 2014-03-13 Tatsuya Takahashi Illumination light source system, projector having the same, and method of controlling projector
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