WO2020241512A1 - Dispositif d'affichage tête haute - Google Patents

Dispositif d'affichage tête haute Download PDF

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Publication number
WO2020241512A1
WO2020241512A1 PCT/JP2020/020371 JP2020020371W WO2020241512A1 WO 2020241512 A1 WO2020241512 A1 WO 2020241512A1 JP 2020020371 W JP2020020371 W JP 2020020371W WO 2020241512 A1 WO2020241512 A1 WO 2020241512A1
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WIPO (PCT)
Prior art keywords
light source
light
control unit
value
lighting
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Application number
PCT/JP2020/020371
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English (en)
Japanese (ja)
Inventor
慎也 白木
泰弘 山川
正則 遠藤
兼太郎 石田
Original Assignee
日本精機株式会社
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Application filed by 日本精機株式会社 filed Critical 日本精機株式会社
Priority to JP2021522321A priority Critical patent/JPWO2020241512A1/ja
Publication of WO2020241512A1 publication Critical patent/WO2020241512A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • This disclosure relates to a head-up display device.
  • a head-up display device selectively emits one of three light sources that emit red, green, and blue light, and generates illumination light of a desired color by switching the light source that emits light at high speed.
  • the head-up display device described in Patent Document 1 is a wave combining means for generating a plurality of light sources that emit red light, green light, and blue light, and illumination light that combines red light, green light, and blue light.
  • a DMD Digital Micro-mirror Device
  • a DMD Digital Micro-mirror Device
  • the illumination light of each color is changed evenly at substantially the same ratio.
  • the ratio of turning on the illumination light of each color is not suitable for the required brightness, and the display quality may be deteriorated.
  • the present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a head-up display device capable of improving display quality.
  • the head-up display device of the present disclosure includes a red light source, a green light source, a blue light source, and a confluent portion that combines the light of each color of each of the light sources to generate illumination light.
  • the DMD display element that reflects the illumination light on the screen to generate an image and the light sources are turned on one by one in a preset order periodically during the display period, and the light of the illumination light is lit according to the required brightness.
  • the light source control unit includes a light source control unit that adjusts the intensity, and the light source control unit is permitted to light the green light source, which is the total of the red lighting permission period during which the red light source is permitted to be lit in one display period.
  • the lighting permission period ratio which is the ratio of the total of the green lighting permission period and the total of the blue lighting permission period in which the blue light source is permitted to be lit, is made different according to the required brightness.
  • the display quality can be improved.
  • a head-up display device (hereinafter referred to as a HUD device) according to the present disclosure will be described with reference to the drawings.
  • the HUD device 1 is mounted on the dashboard of the vehicle 2, generates a display light L representing an image, and emits the generated display light L toward the windshield 3.
  • the display light L reaches the viewer 4 (for example, the driver of the vehicle 2) after being reflected by the windshield 3.
  • the viewer 4 can visually recognize the virtual image V displayed in front of the windshield 3.
  • Various vehicle information such as engine speed and vehicle speed is displayed on the virtual image V, for example.
  • the HUD device 1 includes a lighting device 10, a light intensity detecting unit 500, a light source temperature detecting unit 600, an illumination optical system 20, a DMD display element 30, a light source driving device 5, and projection. It includes an optical system 40, a screen 50, a plane mirror 61, a concave mirror 62, a concave mirror driving unit 65, a housing 70, and a translucent unit 71.
  • the housing 70 is formed in a box shape, for example, by a light-shielding material.
  • the lighting device 10, the illumination optical system 20, the DMD display element 30, the projection optical system 40, the screen 50, the plane mirror 61, the concave mirror 62, and the concave mirror driving unit 65 are housed in the housing 70.
  • the housing 70 is formed with an opening 70a through which the display light L passes.
  • the translucent portion 71 is formed in the shape of a curved plate made of a translucent resin such as acrylic, and is provided so as to close the opening 70a of the housing 70.
  • the lighting device 10 generates illumination light C and emits the generated illumination light C toward the DMD display element 30.
  • the illuminating device 10 includes a light source group 11, a confluence unit 13, a luminance unevenness reduction unit 14, and a transmission film 15.
  • the light source group 11 is composed of, for example, three light sources 11r, 11g, and 11b each consisting of an LED (Light Emitting Diode).
  • the light source 11r is a red light source, and emits red light R when lit.
  • the light source 11g is a green light source, and when it is turned on, it emits green light G.
  • the light source 11b is a blue light source, and emits blue light B when lit.
  • Each of the light sources 11r, 11g, and 11b is driven by the light source driving device 5 and emits light at a predetermined light intensity and timing.
  • the combiner 13 generates illumination light C by aligning the optical axes of red light R, green light G, and blue light B sequentially emitted from the light sources 11r, 11g, and 11b, and the generated illumination light C is used for brightness. It emits light toward the unevenness reduction unit 14.
  • the combiner 13 includes a reflection mirror 13a and dichroic mirrors 13b and 13c that reflect light of a specific wavelength and transmit light of other wavelengths other than the specific wavelength. ..
  • the reflection mirror 13a reflects the incident blue light B toward the dichroic mirror 13b.
  • the dichroic mirror 13b reflects the incident green light G toward the dichroic mirror 13c and transmits the blue light B from the reflection mirror 13a as it is.
  • the dichroic mirror 13c transmits the green light G and the blue light B from the dichroic mirror 13b while reflecting the incident red light R toward the luminance unevenness reducing unit 14. As a result, the dichroic mirror 13c emits the illumination light C, which is a combination of the red light R, the green light G, and the blue light B, toward the luminance unevenness reducing unit 14.
  • the luminance unevenness reducing unit 14 includes a mirror box, an array lens, and the like, and diffusely reflects, scatters, and refracts the illumination light C from the combiner unit 13 to reduce the light unevenness.
  • the transmissive film 15 is made of a transmissive member having a reflectance of, for example, about 5%, transmits most of the illumination light C that has arrived through the luminance unevenness reduction unit 14, and transmits a part of the illumination light C. Is reflected toward the light intensity detection unit 500.
  • the light intensity detection unit 500 is composed of, for example, a light receiving element having a photodiode, and is provided at a position where it receives the illumination light C reflected by the transmission film 15.
  • the light intensity detection unit 500 receives a part of the illumination light C and detects the light intensities of the lights R, G, and B constituting the illumination light C in time division. As shown in FIG. 4, the light intensity detection unit 500 outputs the detection result as a light intensity detection signal SFB to the second control unit 200 described later of the light source driving device 5.
  • the light source temperature detection unit 600 detects the temperatures of the light sources 11r, 11g, and 11b, and outputs the detection result to the second control unit 200 as the light source temperature signal ST.
  • the illumination optical system 20 is composed of a concave lens or the like, and adjusts the illumination light C emitted from the illumination device 10 to a size corresponding to the DMD display element 30.
  • the DMD display element 30 includes a plurality of movable micromirrors 30a.
  • the plurality of micromirrors 30a are arranged in a matrix so as to correspond to the pixels of the image M.
  • the micromirror 30a is provided with an electrode (not shown), and is turned on or off by switching the voltage value applied to the electrode.
  • the micromirror 30a takes an attitude toward an angle that bisects the directions of the illumination light C and the screen 50, and at this time, the illumination light C from the illumination device 10 is reflected toward the screen 50.
  • the micromirror 30a When the micromirror 30a is off, it takes a posture facing a direction different from that of the screen 50, and at this time, the illumination light C is reflected in a direction different from that of the screen 50.
  • Each micromirror 30a expresses the color in each pixel of the image M by adjusting the on period under the control of the second control unit 200.
  • the plurality of micromirrors 30a display information by displaying the image M so as to have a desired gradation for each pixel. More specifically, as shown in FIG. 10, the operation of the micromirror 30a when displaying the image M composed of the gradation from black to white will be described.
  • the low gradation portion A1 represents a pixel region that is close to black and has low brightness.
  • the micromirror 30a corresponding to the low gradation portion A1 is referred to as a micromirror 30a1.
  • the high gradation portion A3 represents a pixel region that is close to white and has high brightness.
  • the micromirror 30a corresponding to the high gradation portion A3 is referred to as a micromirror 30a3.
  • the middle gradation portion A2 is a dark gray between the high gradation portion A3 and the low gradation portion A1, and the brightness pixel region between the high gradation portion A3 and the low gradation portion A1. Represents.
  • the micromirror 30a corresponding to the middle gradation portion A2 is referred to as a micromirror 30a2.
  • the micromirror 30a3 that reflects the illumination light C toward the high gradation portion A3 is turned on for the entire period of the display period Ton, which will be described later, as shown in the lowermost part of FIG.
  • the micromirrors 30a1 that reflect the illumination light C toward the low gradation portion A1 are all in the display period Ton described later, as shown in the third row from the bottom of FIG. It is turned on so as to synchronize with the waveform bands Wr1, Wg1, Wb1 having a smaller width selected from the waveform bands Wr, Wg, and Wb.
  • the on-period of the micromirror 30a1 corresponding to the low-gradation portion A1 is set shorter than the on-period of the micromirror 30a3 corresponding to the high-gradation portion A3. Further, among the plurality of micromirrors 30a, the micromirrors 30a2 that reflect the illumination light C toward the middle gradation portion A2 are all the micromirrors 30a2 in the display period Ton described later, as shown in the second row from the bottom of FIG.
  • the waveform bands Wr1, Wg1, Wb1 having a smaller width selected from the waveform bands Wr, Wg, and Wb the waveform bands Wr2, Wg2, and Wb2 having a width larger than the waveform bands Wr1, Wg1, Wb1 having a smaller width
  • the on period of the micromirror 30a2 corresponding to the middle gradation part A2 is longer than the on period of the micromirror 30a1 corresponding to the low gradation part A1 and longer than the on period of the micromirror 30a3 corresponding to the high gradation part A3. Is also set short.
  • each micromirror 30a reduces the brightness of the image M as the on period becomes shorter, and improves the brightness of the image M as the on period becomes longer.
  • the number and combination of the waveform bands Wr1, Wg1, Wb1, Wr2, Wg2, and Wb2 selected in the low gradation portion A1 and the middle gradation portion A2 are not limited to the example of FIG. 6, and can be changed as appropriate.
  • FIG. 10 the image M composed of gradations from black to white is illustrated, but depending on the combination of colors emitted by the light sources 11r, 11g, and 11b reflected by each micromirror 30a and the length of the on period. A color of desired brightness is displayed on the pixels.
  • the projection optical system 40 is composed of a concave lens, a convex lens, or the like, and efficiently projects the display light L from the DMD display element 30 onto the screen 50.
  • the screen 50 is composed of a holographic diffuser, a microlens array, a diffuser, etc., receives the display light L from the projection optical system 40 on the back surface (lower surface in FIG. 2), and receives the display light L on the front surface (upper surface in FIG. 2).
  • the image M is displayed on the surface).
  • the plane mirror 61 reflects the display light L representing the image M displayed on the screen 50 toward the concave mirror 62.
  • the concave mirror 62 reflects the display light L from the plane mirror 61 toward the windshield 3.
  • the display light L passes through the translucent portion 71 of the housing 70 and is reflected by the windshield 3 toward the viewer 4.
  • the concave mirror drive unit 65 includes a motor and a gear mechanism that transmits the driving force of the motor to the concave mirror 62, which are not shown.
  • the concave mirror driving unit 65 rotates the concave mirror 62 around a rotation axis Ax extending in the direction perpendicular to the paper surface of FIG. By rotating the concave mirror 62 around the rotation axis Ax, the irradiation position of the display light L with respect to the viewer 4 is adjusted in the height direction.
  • the light source driving device 5 includes a current supply unit 300 that supplies a constant current to the light source group 11, an inductor L1, a light source driving unit 43 that drives the light source group 11, a DMD display element 30, and the like.
  • a second control unit 200 for controlling and a first control unit 100 for controlling the concave mirror driving unit 65 and the like are provided.
  • the current supply unit 300 includes a constant current driver IC (Integrated Circuit) that generates a constant current based on electric power from an in-vehicle battery (not shown), and is controlled by a second control unit 200.
  • the current supply unit 300 supplies a constant current to the light source drive unit 43 based on the command signal from the second control unit 200.
  • the current supply unit 300 receives a command signal from the second control unit 200 to turn off the current supply unit 300, the current supply unit 300 stops the supply of the constant current.
  • the inductor L1 is connected between the current supply unit 300 and the light source group 11.
  • the light source drive unit 43 includes switch units Swr, Swg, Swb, Swc, Swa, a capacitor C1, and a voltage detection unit 49.
  • the switch units Swr, Swg, Swb, Swc, and Swa are composed of, for example, n-type channel FETs (Field Effect Transistors), and are on (closed) and off (closed) and off (closed) under the control of the second control unit 200. It switches between (open state).
  • the switch unit Swr is connected in series with the light source 11r between the light source 11r and the ground.
  • the switch unit Swg is connected in series with the light source 11g between the light source 11g and the ground.
  • the switch unit Swb is connected in series with the light source 11b between the light source 11b and the ground.
  • the switch unit Swc and the capacitor C1 are connected in series.
  • the switch unit Swr, the switch unit Swg, the switch unit Swb, the capacitor C1, the switch unit Swc, and the switch unit Swa are connected in parallel with each other. Further, the gate terminals of the switch units Swr, Swg, Swb, Swc, and Swa are connected to the second control unit 200.
  • the switch units Swr, Swg, and Swb When the switch units Swr, Swg, and Swb are switched to the ON state, the current from the current supply unit 300 is passed through the corresponding light sources 11r, 11g, and 11b, and the corresponding light sources 11r, 11g, and 11b are turned on.
  • the switch units Swr, Swg, and Swb cut off the current from the current supply unit 300 to the corresponding light sources 11r, 11g, and 11b by switching to the off state, and turn off the corresponding light sources 11r, 11g, and 11b.
  • the switch unit Swa has a function of controlling the inductor current flowing from the current supply unit 300 to the inductor L1 to a target value by switching to the ON state.
  • the switch unit Swc has a function of adjusting the inclination of the rising portion of the pulse P, which will be described later, by passing a current from the current supply unit 300 to the capacitor C1 by switching to the ON state.
  • the voltage detection unit 49 is connected between the ground and the switch units Swr, Swg, Swb, Swc, and Swa, detects the voltage detection signal SV, and then outputs the voltage detection signal SV to the second control unit 200.
  • the first control unit 100 includes a microcontroller (Central Processing Unit), a memory, and the like, and controls the concave mirror drive unit 65.
  • the required luminance signal SL indicating the light intensity of the ambient light around the vehicle 2 detected through the illuminance sensor 7 is input to the first control unit 100.
  • the first control unit 100 outputs the input requested luminance signal SL to the second control unit 200.
  • the second control unit 200 is an LSI (Large Scale Integration) that realizes a desired function by hardware, and is composed of, for example, an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).
  • the second control unit 200 includes a video signal SE for displaying the image M from the video signal input unit 700, a light source temperature signal ST detected by the light source temperature detection unit 600, and a voltage detection detected by the voltage detection unit 49.
  • the signal SV and the light intensity detection signal SFB detected by the light intensity detection unit 500 are input.
  • the second control unit 200 temperature-corrects the relationship between the current supplied to the light sources 11r, 11g, and 11b based on the light source temperature signal ST and the brightness, and determines the voltage value applied to the light source drive unit 43 based on the voltage detection signal SV. get.
  • the second control unit 200 includes a light source control unit 201 that sets the light intensity of the illumination light C according to the required brightness, and a display element control unit 202 that controls the DMD display element 30.
  • the display element control unit 202 displays information on the image M by controlling each micromirror 30a in the DMD display element 30 on / off based on the video signal SE as described above.
  • the light source control unit 201 determines a target value based on the required luminance signal SL, and compares the determined target value with the light intensity detection signal SFB.
  • the light source control unit 201 supplies a current from the current supply unit 300 to the light source group 11 when the light intensity detection signal SFB becomes less than the target value, and supplies a current when the light intensity detection signal SFB becomes equal to or more than the target value.
  • the supply of current from the unit 300 to the light source group 11 is stopped.
  • the current value supplied from the current supply unit 300 to the light source group 11 is controlled with the target value as the target.
  • This target value is set to a different value for each of the light sources 11r, 11g, and 11b.
  • the light source control unit 201 controls the switch units Swr, Swg, Swb, Swc, and Swa between on and off while synchronizing with the image control by the display element control unit 202. Specifically, the light source control unit 201 outputs an enable signal R_EN for switching the switch unit Swr between on and off to the switch unit Swr, and outputs an enable signal G_EN for switching the switch unit Swg between on and off. The output is output to the switch unit Swg, and the enable signal B_EN for switching the switch unit Swb between on and off is output to the switch unit Swb. Further, the light source control unit 201 outputs an enable signal C_EN for switching the switch unit Swc between on and off to the switch unit Swc, and switches the enable signal S_EN for switching the switch unit Swa between on and off. Output to section Swg.
  • the light source control unit 201 turns on the switch unit Swr through the enable signal R_EN over the lighting permission period Tr (see FIG. 6).
  • the light source control unit 201 turns on the light source 11r and emits red light by supplying the current Ir from the current supply unit 300 to the light source 11r during the lighting permission period Tr.
  • the light source control unit 201 turns on the switch unit Swg through the enable signal G_EN over the lighting permission period Tg (see FIG. 6).
  • the light source control unit 201 lights the light source 11g and emits green light by supplying the current Ig from the current supply unit 300 to the light source 11g during the lighting permission period Tg.
  • the light source control unit 201 turns on the switch unit Swb through the enable signal B_EN over the lighting permission period Tb (see FIG. 6).
  • the light source control unit 201 turns on the light source 11b and emits blue light by supplying the current Ib from the current supply unit 300 to the light source 11b during the lighting permission period Tb.
  • the light source control unit 201 operates by a so-called field sequential method in which any one of the light sources 11r, 11g, and 11b is selectively turned on and the light sources 11r, 11g, and 11b to be turned on are switched at high speed. As shown in FIG. 5, the light source control unit 201 supplies the currents Ir, Ig, and Ib to the light sources 11r, 11g, and 11b during the display period Ton, and turns off the switch units Swr, Swg, and Swb during the non-display period Tof. By doing so, the supply of the currents Ir, Ig and Ib to the light sources 11r, 11g and 11b is stopped.
  • the display period Ton and the non-display period Tof are alternately repeated.
  • One frame is composed of one display period Ton and one non-display period Tof.
  • the display period Ton is composed of a plurality of lighting permission periods Tr, Tg, and Tb in a preset order.
  • the display element control unit 202 drives the micromirror 30a in order to prevent the micromirror 30a from sticking in a constant state. As a result, the failure of the micromirror 30a can be suppressed.
  • the second control unit 200 shifts to either the high-luminance mode or the low-luminance mode based on the required luminance signal SL.
  • the second control unit 200 shifts to the low luminance mode when the required luminance signal SL is equal to or less than the threshold value, and shifts to the high luminance mode when the required luminance signal SL exceeds the threshold value.
  • the threshold value is set to a value when the light intensity of the display light L is 4000 candelas.
  • the second control unit 200 supplies the currents Ir, Ig, and Ib as rectangular waves to the light sources 11r, 11g, and 11b in the high-luminance mode, and in the low-luminance mode, in FIG.
  • the currents Ir, Ig, and Ib are supplied to the light sources 11r, 11g, and 11b as a plurality of pulses P that are triangular waves.
  • the high-luminance mode and the low-luminance mode will be described in detail.
  • the light source control unit 201 presets the light sources 11r, 11g, and 11b in the display period Ton along the waveform pattern Pt of FIG.
  • the currents Ir, Ig, and Ib are supplied in the order given.
  • the waveform pattern Pt includes a plurality of red waveform bands Wr corresponding to the current Ir, a plurality of green waveform bands Wg corresponding to the current Ig, and a plurality of blue waveform bands Wb corresponding to the current Ib. , Are combined so as to be continuous in time.
  • each waveform band Wr, Wg, and Wb having different widths.
  • the widths of the waveform bands Wr1, Wg1, and Wb1 are the smallest.
  • the amplitudes (heights) of the waveform bands Wr, Wg, and Wb are set to different values.
  • the magnitude relationship of each amplitude is set to, for example, "amplitude of waveform band Wg> amplitude of waveform band Wr> amplitude of waveform band Wb".
  • the waveform pattern Pt shown in FIG. 5 is a pattern when the light intensity of the illumination light C is maximum, in other words, a pattern when the required brightness is maximum in the high brightness mode.
  • each waveform band Wr has a width over the entire period of each lighting permission period Tr
  • each waveform band Wg has a width over the entire period of each lighting permission period Tg
  • each waveform band Wb has each lighting.
  • the permission period has a width over the entire period of Tb.
  • the light source control unit 201 changes the light intensity of the illumination light C while maintaining the white balance by repeatedly executing the amplitude variable processing and the current supply period variable processing in order according to the change in the required luminance.
  • the amplitude variable processing is a processing for changing the amplitudes of the currents Ir, Ig, and Ib, that is, the heights of the respective waveform bands Wr, Wg, and Wb. Even when the amplitudes of the currents Ir, Ig, and Ib are changed, the ratios of the amplitudes of the currents Ir, Ig, and Ib are set to be the same in order to maintain the white balance of the illumination light C.
  • the current supply period variable processing is a process of selecting a band to be used from each waveform band Wr, Wg, Wb of the waveform pattern Pt. For example, from the waveform pattern Pt of FIG. 7, the removal band Wd shown by the broken line of FIG. 9 is Will be removed.
  • the light source control unit 201 stops supplying the currents Ir, Ig, and Ib to the light sources 11r, 11g, and 11b via the current supply unit 300 during the lighting permission period Tr, Tg, and Tb corresponding to the removal band Wd. ..
  • the light source control unit 201 supplies the currents Ir, Ig, and Ib to the light sources 11r, 11g, and 11b along the waveform bands Wr, Wg, and Wb excluding the removal band Wd.
  • the current supply period variable processing is not limited to the processing excluding the removal band Wd selected from the plurality of waveform bands Wr, Wg, Wb described above, and the width of the selected waveform bands Wr, Wg, Wb (lighting permission period).
  • the process may be a process of reducing the on-duty ratio of the waveform bands Wr, Wg, and Wb in Tr, Tg, and Tb.
  • the predetermined value is a value for switching between the amplitude variable processing and the current supply period variable processing.
  • the light source control unit 201 executes the amplitude variable processing according to the decrease in the required luminance up to a predetermined value via the current supply unit 300, and as shown in FIGS. 7 and 8, the waveform bands Wr, Wg, The amplitude of Wb is lowered from the initial value.
  • the light source control unit 201 returns the amplitudes of the waveform bands Wr, Wg, and Wb to the initial values, and then executes the current supply period variable processing to execute all the waveform bands.
  • the currents Ir, Ig, and Ib are supplied to the light sources 11r, 11g, and 11b along the waveform bands Wr, Wg, and Wb of Wr, Wg, and Wb excluding the removal band Wd.
  • the amplitude variable processing is executed again in the waveform bands Wr, Wg, and Wb excluding the removal band Wd, and then the current supply period variable processing is executed. As the required luminance decreases, the number of removal bands Wd in the current supply period variable processing is increased.
  • the light source control unit 201 supplies currents Ir, Ig, and Ib composed of a plurality of pulses P to the light sources 11r, 11g, and 11b during the lighting permission period Tr, Tg, and Tb, as shown in FIG. ..
  • the second control unit 200 (light source control unit 201) turns on the switch units Swr and Swc before generating the pulse P in the lighting permission period Tr, and switches units.
  • the current from the current supply unit 300 flows to the ground via the switch unit Swa, and the current Ir supplied to the light source 11r decreases. As a result, the waveform of the falling portion of the pulse P is formed. As described above, a plurality of pulses P are generated in each lighting permission period Tr, Tg, and Tb.
  • the light source control unit 201 changes the light intensity of the illumination light C while maintaining white balance by executing a pulse number variable process that increases or decreases the number of pulses P according to a change in the required brightness in the low brightness mode. For example, the light source control unit 201 reduces the number of pulses P in each lighting permission period Tr, Tg, and Tb when the required brightness decreases in the low brightness mode.
  • the pulse number variable processing not only the pulse number variable processing but also the amplitude variable processing may be executed as in the high-luminance mode. In this case, in the low-luminance mode, as the required luminance decreases, the amplitude variable processing and the pulse number variable processing for changing the amplitude of the pulse P are repeatedly executed in order.
  • the second control unit 200 (light source control unit 201) is set so that the lighting permission period ratio is different.
  • the lighting permission period ratio is the ratio of the total of the plurality of lighting permission periods Tr, the total of the plurality of lighting permission periods Tg, and the total of the plurality of lighting permission periods Tb in the display period Ton.
  • the lighting permission period Tr is a period in which the switch unit Swr is turned on
  • the lighting permission period Tg is a period in which the switch unit Swg is turned on
  • the lighting permission period Tb is a period in which the switch unit Swb is turned on.
  • the total of the plurality of lighting permission periods Tr in one display period Ton was defined as the red value Xr
  • the total of the plurality of lighting permission periods Tg was defined as the green value Xg
  • the total of the plurality of lighting permission periods Tb was defined as the blue value Xb.
  • the lighting permission period ratio is represented by "Xr: Xg: Xb”.
  • the lighting permission period ratio is the total of the periods during which the enable signal R_EN indicating that the switch unit Swr is turned on is output in the display period Ton, and the enable signal G_EN indicating that the switch unit Swg is turned on is output. It is the ratio of the total of the periods and the total of the periods during which the enable signal B_EN indicating that the switch unit Swb is turned on is output.
  • a switch pattern for high brightness that realizes the lighting permission period ratio in the high brightness mode and a switch pattern for low brightness that realizes the lighting permission period ratio in the low brightness mode are previously provided. It is remembered.
  • the second control unit 200 switches each switch unit Swg, Swb, Swa between on and off according to a low-luminance switch pattern stored in a memory (not shown), and the high-luminance mode.
  • each switch unit Swg, Swb, Swa is switched between on and off according to a switch pattern for high brightness stored in a memory (not shown). As shown in the first to third stages from the top of FIG.
  • each of the above switch patterns defines the on and off states of the switch units Swg, Swb, and Swa during the display period Ton.
  • the lighting permission period ratio is set to be different by adjusting the lighting permission periods Tr, Tg, and Tb. For example, when increasing the red value Xr of the lighting permission period ratio, the length of the selected lighting permission period Tr among the plurality of lighting permission period Trs is lengthened, and the selected lighting permission period Tg or the selected lighting permission period Tg or The length of the lighting permission period Tb may be shortened. Further, not limited to this, a new lighting permission period Tr is added in addition to the existing lighting permission period Tr in the display period Ton, and the existing lighting permission period Tg or the lighting permission period Tb is removed or shortened accordingly. May be good.
  • the red value Xr in the high-luminance mode is set to a value larger than the red value Xr in the low-luminance mode.
  • the luminous efficiency of the light source 11r is more likely to decrease than that of the light sources 11g and 11b, which has conventionally caused a lack of brightness of the light source 11r.
  • the red value Xr in the high-luminance mode is set to a large value, it is possible to prevent the red light R of the light source 11r from being insufficient in brightness in the high-luminance mode. Further, the red light R has a greater influence on the brightness of the illumination light C than the green light G and the blue light B.
  • the light intensity of the illumination light C can be increased by increasing the red value Xr. Therefore, by increasing the red value Xr in the high-luminance mode, it is possible to prevent the light intensity of the illumination light C in the high-luminance mode from being insufficient. On the other hand, in the low-luminance mode, the light intensity of the illumination light C is unlikely to be insufficient, so there is no problem even if the red value Xr in the low-luminance mode is reduced.
  • the blue value Xb in the low-luminance mode is set to a value larger than the blue value Xb in the high-luminance mode.
  • the white balance cannot be maintained in the low brightness mode.
  • the low gradation portion A1 in FIG. 10 is yellowish. A part with a yellow color is generated.
  • by increasing the blue value Xb in the low-luminance mode it is possible to add a blue component to the yellowish portion, the white balance is maintained even in the low-luminance mode, and the display quality is improved.
  • the green value Xg in the low-luminance mode is set to a value larger than the green value Xg in the high-luminance mode.
  • the magnitude relationship between the red value Xr, the green value Xg, and the blue value Xb is set to "Xr>Xg>Xb".
  • the variation of the red value Xr, the green value Xg, and the blue value Xb is set to be smaller than the variation of the high-luminance mode.
  • the red value Xr, the green value Xg, and the blue value Xb are set to substantially the same value, the red value Xr and the green value Xg are small, and the brightness of the illumination light C may be insufficient in the high brightness region of the low brightness mode. There is.
  • the red value Xr and the green value Xg are set higher than the blue value Xb in order to eliminate the insufficient brightness of the illumination light C in the high brightness region of the low brightness mode.
  • the lighting permission periods Tr and Tg become longer, so that the pause time between two adjacent pulses P can be set. It can be lengthened, and heat generation of the switch portions Swr and Swg can be suppressed. Further, as a measure against heat generation of the switch portions Swr and Swg, it is possible to prevent the switch portions Swr and Swg from becoming large in size.
  • the red value Xr and the green value Xg are smaller and the blue value Xb is larger than in the high-luminance mode.
  • the number of pulses P supplied to the light source 11r is reduced as compared with the high-luminance mode.
  • the number of pulses P supplied to the light source 11b and the number of pulses P supplied to the light source 11g are increased by the reduced amount.
  • the increase in the pulse P supplied to the light source 11b is larger than the increase in the pulse P supplied to the light source 11g.
  • the second control unit 200 may execute a part of the control content of the first control unit 100, and conversely, a part of the control content of the second control unit 200 may be executed by the first control unit 200.
  • the control unit 100 may execute it.
  • the first and second control units 100 and 200 may be configured as one control unit.
  • the HUD device 1 is lit with a light source 11r, which is an example of a red light source that emits red light R when lit, and a light source 11g, which is an example of a green light source that emits green light G when lit.
  • a light source 11b which is an example of a blue light source that emits blue light B, and an illumination light C that combines the red light R, green light G, and blue light B of the light sources 11r, 11g, and 11b are generated.
  • the red light source 11r, the green light source 11g, and the blue light source 11b are periodically turned on in a preset order during the display period Ton, the DMD display element 30 that generates the image M based on the illumination light C, and the required brightness signal. It includes a light source control unit 201 that adjusts the light intensity of the illumination light C according to the required brightness based on SL.
  • the light source control unit 201 is the total of the lighting permission period Tr, which is an example of the red lighting permission period in which the red light source 11r is permitted to light in one display period Ton, and the green lighting permission in which the green light source 11g is permitted to light.
  • the lighting permission period ratio which is the ratio of the total lighting permission period Tg, which is an example of the period, and the total lighting permission period Tb, which is an example of the blue lighting permission period in which the blue light source 11b is permitted to be lit, is determined according to the required brightness. Differentiate to suit the required brightness.
  • the lighting permission period ratio is set to the same value regardless of the required brightness as in the conventional case, for example, in order to secure the light intensity of the illumination light C, the red value corresponding to the light source 11r in the lighting permission period ratio. It is conceivable that Xr is set larger than the green value Xg corresponding to the light source 11g and the blue value Xb corresponding to the light source 11b.
  • the lighting permission period ratio is set to a value suitable for the required brightness. Therefore, the display quality can be improved.
  • the light source control unit 201 increases the required luminance based on the required luminance signal SL, and increases the red value Xr corresponding to the light source 11r of the lighting permission period ratio when the mode shifts from the low luminance mode to the high luminance mode.
  • the luminous efficiency of the light source 11r tends to decrease as compared with the light sources 11g and 11b, which tends to reduce the brightness of the light source 11r.
  • the red value Xr in the high brightness mode is set to a large value, it is possible to prevent the red light R of the light source 11r and the illumination light C from being insufficient in brightness.
  • the low-luminance mode it is unlikely that the light intensity of the illumination light C will be insufficient, so there is no problem even if the red value Xr in the low-luminance mode is reduced.
  • the light source control unit 201 lowers the required luminance based on the required luminance signal SL, and increases the blue value Xb corresponding to the light source 11b of the lighting permission period ratio when shifting from the high luminance mode to the low luminance mode.
  • the red value Xr in the lighting permission period ratio is the green value Xg and It is conceivable that the value is set larger than the blue value Xb. In this case, the blue value Xb is insufficient at the time of low brightness, the white balance is not maintained, and for example, the low gradation portion A1 in FIG. 10 may be yellowish.
  • the blue value Xb in the low-luminance mode it is possible to add a blue component to the yellowish portion, and the white balance is maintained even in the low-luminance mode. Display quality is improved.
  • the light source control unit 201 changes the variation of the red value Xr corresponding to the light source 11r of the lighting permission period ratio in the low brightness mode, the green value Xg corresponding to the light source 11g, and the blue value Xb corresponding to the light source 11b to high brightness. It is set smaller than the variation of the red value Xr, the green value Xg, and the blue value Xb in the mode. According to this configuration, the variation of the red value Xr, the green value Xg, and the blue value Xb in the low luminance mode becomes small, so that the light intensity of any of the red light R, the green light G, and the blue light B may be insufficient. It is suppressed, which improves the display quality.
  • the light source control unit 201 supplies the currents Ir, Ig, Ib of a plurality of pulses P to the light sources 11r, 11g, 11b in a preset order in the low brightness mode in which the required brightness is low, and in the low brightness mode. The number of pulses P is reduced as the required brightness becomes lower.
  • the light source control unit 201 supplies currents in the waveform bands Wr, Wg, and Wb, which are examples of rectangular waves, to the light sources 11r, 11g, and 11b in a preset order in the high-luminance mode in which the required brightness is higher than that in the low-luminance mode.
  • the amplitudes of the waveform bands Wr, Wg, and Wb are reduced, or the widths of the waveform bands Wr, Wg, and Wb (the length in the left-right direction in FIG. 6) are reduced.
  • the selected waveform bands Wr, Wg, Wb like the removal band Wd described above are removed, that is, the selected waveform bands Wr, Wg, It also includes setting the width of Wb to zero. According to this configuration, in the low brightness mode, the brightness of the illumination light C can be finely adjusted by the number of pulses P.
  • the light source control unit 201 uses one of the two lighting permission period ratios that differ depending on the required brightness, but three or more lighting permission period ratios that differ depending on the required brightness. Any one of the above may be used. Further, the lighting permission period ratio may be gradually changed according to the required brightness.
  • the HUD device 1 is for in-vehicle use, but it is not limited to the in-vehicle use, and may be mounted on a vehicle such as an airplane or a ship. Further, although the display light L from the HUD device 1 is projected on the windshield 3, it may be projected on a dedicated combiner.
  • the second control unit 200 has shifted to either the high-luminance mode or the low-luminance mode based on the required luminance signal SL indicating the light intensity of the external light, but the HUD is not limited to this. Assuming that the required brightness is changed by the viewer 4 operating an operation unit (not shown) provided in the device 1 or the vehicle 2, the mode may be shifted between the above modes.
  • the green value Xg in the low-luminance mode is set to a value larger than the green value Xg in the high-luminance mode, but is not limited to this, and is set to the same value as the green value Xg in the high-luminance mode. May be done.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Projection Apparatus (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

L'objectif de la présente invention est de fournir un dispositif d'affichage tête haute permettant d'améliorer la qualité de l'affichage. Ce dispositif d'affichage tête haute comprend : une source de lumière 11r ; une source de lumière 11g ; une source de lumière 11b ; une unité de combinaison de lumière pour générer une lumière d'éclairage dans laquelle la lumière de chaque couleur provenant des sources de lumière 11r, 11g et 11b a été combinée ; un élément d'affichage 30 de dispositif de micro-miroir numérique (DMD) pour générer une image par réflexion de la lumière d'éclairage sur un écran ; et une unité de commande de source de lumière 201 pour allumer périodiquement les sources de lumière 11r, 11g, 11b une par une dans un ordre prédéfini dans une période d'affichage, et ajuster l'intensité lumineuse de la lumière d'éclairage conformément à une luminance demandée sur la base d'un signal de luminance demandé SL. L'unité de commande de source de lumière 201 amène un rapport de période autorisée d'éclairage, qui est le rapport de la période autorisée d'éclairage total pour la source de lumière 11r, la période autorisée d'éclairage total pour la source de lumière 11g, et la période autorisée d'éclairage total pour la source de lumière 11b dans une période d'affichage, à différer en fonction de la luminance demandée.
PCT/JP2020/020371 2019-05-27 2020-05-22 Dispositif d'affichage tête haute WO2020241512A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7174475B1 (ja) * 2022-07-06 2022-11-17 隆利 小林 フルカラーｌｅｄのｈｓｖ色空間に基づく調光制御
WO2022270343A1 (fr) * 2021-06-21 2022-12-29 日本精機株式会社 Affichage tête haute

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001069584A1 (fr) * 2000-03-14 2001-09-20 Mitsubishi Denki Kabushiki Kaisha Afficheur d'image et procede d'affichage d'image
JP2003044016A (ja) * 2001-08-02 2003-02-14 Matsushita Electric Ind Co Ltd 液晶表示装置及び液晶表示装置の駆動方法
WO2016051846A1 (fr) * 2014-09-29 2016-04-07 富士フイルム株式会社 Dispositif d'affichage par projection et procédé de commande de source de lumière associé
JP2018200811A (ja) * 2017-05-26 2018-12-20 日本精機株式会社 光源駆動装置及びヘッドアップディスプレイ装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001069584A1 (fr) * 2000-03-14 2001-09-20 Mitsubishi Denki Kabushiki Kaisha Afficheur d'image et procede d'affichage d'image
JP2003044016A (ja) * 2001-08-02 2003-02-14 Matsushita Electric Ind Co Ltd 液晶表示装置及び液晶表示装置の駆動方法
WO2016051846A1 (fr) * 2014-09-29 2016-04-07 富士フイルム株式会社 Dispositif d'affichage par projection et procédé de commande de source de lumière associé
JP2018200811A (ja) * 2017-05-26 2018-12-20 日本精機株式会社 光源駆動装置及びヘッドアップディスプレイ装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022270343A1 (fr) * 2021-06-21 2022-12-29 日本精機株式会社 Affichage tête haute
JP7174475B1 (ja) * 2022-07-06 2022-11-17 隆利 小林 フルカラーｌｅｄのｈｓｖ色空間に基づく調光制御

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