JP6135037B2 - Projection apparatus, projection method, and program - Google Patents

Description

  The present invention relates to a projection apparatus, a projection method, and a program that are particularly suitable for a DLP (Digital Light Processing) (registered trademark) projector.

  Conventionally, in a projection apparatus using an LED (light emitting diode) or LD (semiconductor laser) semiconductor light emitting element as a light source, the light emission efficiency varies greatly due to thermal fluctuation immediately after the light emission of the element starts and after that. Considering fluctuations is essential for improving the quality of the projected image.

  Thus, by adjusting the brightness of the light emitting element of each color of the LED array based on the supply power waveform information that cancels the luminance fluctuation in each field period for each color component with respect to the LED array, the influence of the thermal fluctuation of the light source can be reduced. A technique that suppresses and maintains the quality of the projected image at a high level is considered. (For example, Patent Document 1)

JP 2010-211134 A

  In the above-described patented technology, the supply power is further increased to control the emission luminance in the same field to be uniform in order to offset the decrease in the light emission efficiency due to the temperature variation of the semiconductor light emitting element. Therefore, when driving with supply power so that optimum light emission luminance can be obtained in a state where the temperature has not yet increased immediately after light emission, driving with higher power is performed in a state in which the subsequent temperature has increased. There is a possibility that the thermal load is large and the element is deteriorated.

  By making multiple primary color semiconductor light emitting elements emit light at the same time, a field for projecting a light image using a complementary color or white as a mixed color is set in the frame to improve the color reproducibility and brightness of the overall image. Some drive systems are used.

  When such a complementary color or white image projection field is set, the light emission efficiency change characteristic differs for each light source element of each color.

  In addition, an element that continuously emits light from a field located before the complementary color field and an element that starts light emission in the complementary color field, even when emitting light in the same complementary color field, have their respective temperature characteristics and emission time. Both are different.

  FIG. 5A shows a light source by a G semiconductor light emitting element and a light source by an R (red) semiconductor light emitting element when a G (green) field is located following a Ye (yellow) field which is a complementary color field. Each light emission waveform is shown. The light emission waveform of the G light source has a high peak value over two field periods as shown in FIG. 5 (A-1), whereas the R light source as shown in FIG. 5 (A-2). The light emission waveform is only the initial Ye field period and has a very low peak value with respect to the G light source.

  In addition, both the light source for G and the light source for R initially have the highest brightness because the element temperature is low, and after the brightness suddenly decreases due to the temperature rise of the element, the amount of heat absorbed and the amount of heat released gradually cancel each other. The rate of being increased increases and the rate of decrease is gradual.

  However, during the process in which the light emission luminance of the G light source is still decreasing, the light emission luminance of the R light source is gradually stabilized, and the period of simultaneous light emission is stopped. It can be seen that the difference is significant.

  FIG. 5B shows a semiconductor light emission for G in the case where a G (green) field is located on the front side and an R (red) field is located behind the Ye (yellow) field which is a complementary color field. Each light emission waveform of the light source by an element and the light source by the semiconductor light emitting element for R (red) is shown.

  Both the light source for G and the light source for R have the highest luminance at the beginning of the light emission period because the element temperature is low, and after the luminance decreases due to the temperature rise of the element, there is a ratio that the heat absorption amount and the heat dissipation amount are gradually offset. Increases and decreases the rate of decrease.

  However, due to the difference in the light emission timings of the two light emitting elements, in the central Ye field, the emission waveform of the G light source is stable in a lowered state as shown in FIG. As shown in FIG. 5 (B-2), the emission waveform of the R light source is in the process of rapidly decreasing from the highest state at the beginning of light emission, and in this case also, the time characteristics of the emission luminance are significantly different between the two light source elements. Can be seen.

  When the luminance time characteristics of a plurality of light source elements that emit light at the same time are remarkably different as described above, even if a method for adjusting the current for driving the light source elements is adopted, accurate gradation expression is obtained in the field period in which light is emitted simultaneously. This may result in unnatural colors such as inversion of the gradation in some areas.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a projection capable of achieving both luminance improvement and accurate gradation expression by simultaneous light emission of a plurality of color semiconductor light emitting elements. An apparatus, a projection method, and a program are provided.

According to one embodiment of the present invention, a light source capable of emitting light by adjusting brightness of each color light-emitting element for each color, a driving unit that controls light emission or extinction of the light-emitting element for each color, and a plurality of colors by the driving unit Adjusting means for adjusting gradation modulation values of a plurality of colors of the light source on the basis of luminance time characteristics with the passage of time from the start of light emission in a simultaneous light emission period in which the light emitting elements are simultaneously emitted. And

  According to the present invention, it is possible to achieve both luminance improvement and accurate gradation expression by simultaneous light emission of a plurality of color semiconductor light emitting elements.

The figure which shows the structure of the electronic circuit and optical system of the data projector apparatus which concern on one Embodiment of this invention. FIG. 3 is a diagram illustrating a specific configuration example of an optical system according to the embodiment. 9 is a flowchart showing processing contents mainly related to a gradation calibration operation according to the embodiment. The timing chart which shows the light emission period of the image frame and each light source element which concerns on the same embodiment. The wave form diagram which illustrates the brightness | luminance time characteristic in the case of light-emitting simultaneously the semiconductor light-emitting element of multiple colors.

  An embodiment in which the present invention is applied to a DLP (registered trademark) data projector apparatus will be described below with reference to the drawings.

FIG. 1 is a diagram showing a schematic functional configuration of a data projector apparatus 10 according to the present embodiment.
The input unit 11 includes, for example, a pin jack (RCA) type video input terminal, a D-sub 15 type RGB input terminal, an HDMI (High-Definition Multimedia Interface) terminal, and the like. Various standard analog or digital image signals input to the input unit 11 are digitized by the input unit 11 as necessary, and then sent to the image conversion unit 12 via the system bus SB.

  The image conversion unit 12 is also referred to as a scaler or a formatter. The input digital value image data is unified into image data of a predetermined format suitable for projection and sent to the projection processing unit 13. At this time, the image conversion unit 12 sends the PWM signal information to the projection processing unit 13 after referring to the gradation table by a gradation conversion unit 12A provided therein, as will be described later.

  At this time, data such as symbols indicating various operation states for OSD (On Screen Display) is also superimposed on the image data by the image conversion unit 12 as necessary, and the processed image data is sent to the projection processing unit 13.

  The projection processing unit 13 multiplies a frame rate according to a predetermined format, for example, 60 [frames / second], the number of color component divisions, and the number of display gradations according to the transmitted image data. The micromirror element 14 that is a spatial light modulation element is driven to display by the time-division driving.

  This micromirror element 14 is turned on / off individually at a high speed for each inclination angle of a plurality of micromirrors arranged in an array, for example, WXGA (Wide eXtended Graphics Array) (horizontal 1280 pixels × vertical 800 pixels). By displaying the image, an optical image is formed by the reflected light.

  On the other hand, R, G, and B primary color lights are emitted cyclically from the light source unit 15 in a time-sharing manner. The primary color light from the light source unit 15 is totally reflected by the mirror 16 and applied to the micromirror element 14.

  Then, an optical image is formed by the reflected light from the micromirror element 14, and the formed optical image is projected and displayed on a screen (not shown) to be projected via the projection lens unit 17.

The light source unit 15 includes an LD 18 that emits blue laser light.
The blue laser light (B) emitted from the LD 18 is reflected by the mirror 19, passes through the dichroic mirror 20, and then irradiates the peripheral surface of the fluorescent wheel 21. The fluorescent wheel 21 is rotated by a wheel motor (M) 22 and forms a phosphor layer 21g over the entire circumference of the peripheral surface irradiated with the blue laser light.

  More specifically, the phosphor layer 21g is formed by applying a phosphor on the circumference of the phosphor wheel 21 on which the laser light is irradiated. On the back surface of the surface of the fluorescent wheel 21 where the phosphor layer 21g is formed, a reflector (not shown) is provided so as to overlap the phosphor layer 21g.

  By irradiating the phosphor layer 21g of the fluorescent wheel 21 with blue laser light, green light (G) is excited as reflected light. The green light is reflected by the dichroic mirror 20, reflected by the dichroic mirror 23, converted into a luminous flux having a uniform luminance distribution by the integrator 24, reflected by the mirror 25, and reaches the mirror 16.

The light source unit 15 further includes an LED 26 that emits red light and an LED 27 that emits blue light.
The red light (R) emitted from the LED 26 passes through the dichroic mirror 20, is reflected by the dichroic mirror 23, is converted into a luminous flux having a uniform luminance distribution by the integrator 24, and is then reflected by the mirror 25. The mirror 16 is reached.

  The blue light (B) emitted from the LED 27 passes through the dichroic mirror 23, is converted into a luminous flux having a uniform luminance distribution by the integrator 24, is reflected by the mirror 25, and reaches the mirror 16.

As described above, the dichroic mirror 20 transmits blue light and red light while reflecting green light. The dichroic mirror 23 transmits blue light while reflecting green light and red light.
In the present embodiment, light that has not been reflected in the direction of the projection lens unit 17, so-called “off light”, is incident on the luminance sensor 28 that is a measuring unit in the operation of distributing the reflected light by the micromirror element 14. The luminance sensor 28 measures the illuminance of the incident light and outputs a signal indicating the luminance to the projection processing unit 13 as will be described in detail later.

  The projection processing unit 13 forms a light image by displaying an image on the micromirror element 14, emits light from the LD 18 and LEDs 26 and 27, rotates the fluorescent wheel 21 by the wheel motor 22, and brightness by the brightness sensor 28. Is measured under the control of the CPU 29 described later.

  The CPU 29 controls all the operations of the above circuits. The CPU 29 is directly connected to the main memory 30 and the program memory 31. The main memory 30 is composed of, for example, an SRAM and functions as a work memory for the CPU 29. The program memory 31 is composed of an electrically rewritable non-volatile memory. The operation program executed by the CPU 29 and various fixed data, and a gradation table 31A, the period of primary colors R, G, and B, which will be described later, and the color mixture. The setting value of the PWM pattern for each of a plurality of gradation values corresponding to the periods of Ye and W is stored. The CPU 29 uses the main memory 30 and the program memory 31 to execute a control operation in the data projector device 10.

The CPU 29 executes various projection operations in accordance with key operation signals from the operation unit 32.
The operation unit 32 includes a key operation unit provided in the main body of the data projector device 10 and an infrared light receiving unit that receives infrared light from a remote controller (not shown) dedicated to the data projector device 10. A key operation signal based on a key operated by the key operation unit or the remote controller is directly output to the CPU 29.

  The CPU 29 is further connected to the audio processing unit 33 via the system bus SB. The sound processing unit 33 includes a sound source circuit such as a PCM sound source, converts the sound data provided via the system bus SB during the projection operation into an analog signal, drives the speaker unit 34 to emit a loud sound, or beeps when necessary. Is generated.

  Next, a more specific configuration example of the optical system including the light source unit 15, the micromirror element 14, and the projection lens unit 17 will be described with reference to FIG.

  In FIG. 2, the LD 18 is composed of a plurality of, for example, 8 × 4 (in a direction perpendicular to the paper) LD array arranged in a matrix of 24, and the blue laser light emitted by each light emission is The same number of mirrors are reflected by a mirror 19 formed of a mirror array in which steps are provided and arranged in a matrix.

  The blue laser light reflected by the mirror 19 is projected onto the fluorescent wheel 21 via the lenses 41 and 42, the dichroic mirror 20, and the lenses 43 and 44.

  The green light excited by the phosphor layer 21g (see FIG. 1) of the fluorescent wheel 21 is reflected by a reflector (not shown) provided on the back surface of the surface on which the phosphor layer 21g of the fluorescent wheel 21 is formed. The light is reflected by the dichroic mirror 20 through the lenses 43 and 44, and is reflected by the dichroic mirror 23 after passing through the lens 45.

  The green light reflected by the dichroic mirror wheel 23 is reflected by the mirror 25 via the lens 46, the integrator 24 and the lens 47, and further reaches the mirror 16 via the lens 48.

  The green light reflected by the mirror 16 is irradiated to the micromirror element 14 through the lens 49, and a corresponding color light image is formed by the micromirror element 14. The formed optical image is emitted to the projection lens unit 17 side through the lens 49.

  The red light emitted from the LED 26 passes through the dichroic mirror 20 through the lenses 50 and 51 and is reflected by the dichroic mirror 23 through the lens 45.

  Blue light emitted from the LED 27 passes through the dichroic mirror 23 through the lenses 52 and 53.

Next, the operation of the above embodiment will be described.
As described above, all of the operations described below are executed after the CPU 29 develops and stores the operation program, fixed data, and the like read from the program memory 31 in the main memory 30.

  In the present embodiment, when one frame of a color image is projected, for example, as shown in FIG. 4, the frame is R (red), Ye (yellow), G (green), B (blue), W (white). It is assumed that the image of the color is projected.

  In the projection processing unit 13, images corresponding to the red signal R are R (red) field, Ye (yellow) field, W (white) field period, images corresponding to the green signal G are Ye (yellow) field, The image corresponding to the blue signal B during the G (green) field and W (white) field periods is allocated to the B (blue) field and W (white) field periods, respectively, and the luminance level time of the light source. PWM signals (ON / OFF) corresponding to the gray levels of the red signal R, green signal G, and blue signal B so that display corresponding to the corresponding gray level is performed as the sum of the plurality of fields to which the integral values are allocated. Signal).

  Then, using the next frame period, the micromirror element 14 performs display based on the PWM signal.

  In the Ye (yellow) field, the projection processing unit 13 causes the LD 18 for green light and the LED 26 for red light to emit light simultaneously.

  Furthermore, in the W (white) field, the projection control unit 13 causes all of the LD 18 for green light, the LED 26 for red light, and the LED 27 for blue light to emit light simultaneously.

  FIG. 3 is a flowchart showing extracted processing contents mainly relating to the gradation calibration operation, which is executed while the power of the data projector apparatus 10 is on.

  With the power turned on, the CPU 29 determines whether or not it is time to perform a calibration operation (step S101).

  Here, the timing of performing the calibration operation corresponds to, for example, a continuous projection time every fixed time (ex. 30 minutes) at the beginning of power-on, and the continuous operation time set by the CPU 29 in the main memory 30 The determination is made based on the contents of the register to be counted.

  If it is determined in step S101 that it is not the timing for performing the calibration operation, the CPU 29 performs a normal projection operation from the input unit 11 based on the gradation data for each of the R, G, and B colors set at that time. An image corresponding to the input image signal is displayed on the micromirror element 14 to form a light image by reflected light, and is emitted from the projection lens unit 17 onto a screen to be projected (step S102). The process returns to S101.

  FIG. 4 shows the processing timing of the projection operation executed mainly by the CPU 29 during the normal projection. As described above, as shown in FIG. 4A, one color image frame is composed of five fields of R (red), Ye (yellow), G (green), B (blue), and W (white). An image corresponding to the (red), G (green), and B (blue) signals is projected.

  The Ye field is set as a complementary color image projection period by mixing red light and green light so that the LED 26 emitting red light and the LD 18 emitting blue excitation light simultaneously emit light to obtain green light. It is driven by the projection processing unit 13.

  The W field is set as a projection period of a luminance image (monochrome image) by mixing red light, green light, and blue light. The LED 26 that emits red light, and blue excitation light to obtain green light. The LD 18 that emits light and the projection lens unit 17 that emits blue light are all driven by the projection processing unit 13 so as to emit light simultaneously.

  Therefore, as shown in FIG. 4B, the light emission timing of the LED 26 which is a light source that emits red light is a period from the W field of the previous frame to the R field and Ye field of the frame.

  As shown in FIG. 4C, the light emission timing of the LD 18 that emits blue excitation light to obtain green light is two periods of the Ye field, the G field, and the W field of the frame.

  Further, as shown in FIG. 4D, the emission timing of the LED 27 emitting blue light is the B field and the W field of the frame.

  FIGS. 4E to 4G illustrate luminance time characteristics of the light source elements for each color. As shown in the figure, the luminance level differs greatly for each color light source (G> R> B), the luminance is highest at the beginning of the light emission period, and the luminance is rapidly decreased due to the temperature rise of the element. The rate at which is offset increases, and the rate of decline becomes gradual.

  On the other hand, if it is determined in step S101 that it is time to perform the calibration operation, the CPU 29 initializes the variable n for designating the light source for the calibration operation to “0” (step S103), and then sets the value of the variable n. Here, the luminance time characteristic of the LED 26 designated by “0” is measured (step S104).

  In the measurement of the luminance time characteristic, for example, only the LED 26 emits light over two image frames, and the timing shown in FIG. 4B, that is, from the W field of the first frame to the Ye field of the second frame. The projection processing unit 13 is driven to emit light.

  At this time, the projection processing unit 13 reflects all the light from the light source unit 15 on the luminance sensor 28 side, not on the projection lens unit 17 side, so that the entire image displayed on the micromirror element 14 is black. . Note that the light sources of the other colors at that time are set to operate corresponding to OFF.

As a result, the luminance time characteristic of the LED 26 that changes as shown in FIG. 4E is measured using the luminance sensor 28.
This measurement result is data representing luminance time characteristics with the passage of time from the start of light emission of the LED 26 emitting red light based on this field configuration.

  Thereafter, the value of the variable n is updated by “+1” (step S105), and the updated value of the variable n is not “3” indicating that the measurement of the luminance time characteristics of R, G, and B is finished. After confirming this (step S106), the process returns to step S104.

  By repeatedly executing the processes of steps S104 and S105 in this manner, the CPU 29 executes the luminance time characteristic of green light and the luminance time characteristic of blue light in the same manner while updating and setting the value of the variable n.

  That is, when measuring the luminance time characteristic of green light, the LD 18 is caused to emit light at the timing shown in FIG. 4C, that is, the Ye field and G field in one image frame, and the W field 6. . Note that during the measurement period, the light sources of the other colors are set to operate corresponding to OFF.

  In measuring the luminance time characteristic of blue light, the LED 27 is caused to emit light at the timing shown in FIG. 4D, that is, the B field and the W field 6 in one image frame. Note that during the measurement period, the light sources of the other colors are set to operate corresponding to OFF.

  After the measurement of the luminance time characteristic of the blue light is finished, when the value of the variable n is updated by “+1” and set to “3” in step S105, the CPU 29 determines from the value of the variable n to R in the subsequent step S106. , G and B luminance time characteristics are determined to have been measured.

  Next, the CPU 29 adjusts the gradation modulation data (gradation modulation value) which is the PWM timing information corresponding to the primary color (R, G, B) period based on the measured luminance time characteristics of R, G, B. Thus, it is set in the gradation table 31A of the program memory 31 (step S107).

  Further, based on the set luminance time characteristics of R, G, and B, the CPU 29 performs gradation modulation that is PWM timing information during the Ye field and W field periods, which are mixed color fields by simultaneously emitting light of a plurality of colors. The data is calculated in consideration of the deviation of each light emission start time, and the gradation modulation data for obtaining the calculated accurate gradation is adjusted and set in the gradation table 31A of the program memory 31 (step S108). .

  In steps S107 and S108, it is considered that the on period of the PWM signal is not locally concentrated (continuous), and a tone reversal phenomenon occurs due to the luminance attenuation curve of each of the R, G, and B light sources. The gradation table 31A is adjusted (set) in consideration of the luminance time characteristics of R, G, and B so as not to exist.

  Assuming that the calibration operation has been completed, the process returns to step S101.

  As described above in detail, according to the present embodiment, each gradation modulation data for obtaining an accurate gradation is adjusted in consideration of the shift of each emission start time in the simultaneous emission period, and the level of the program memory 31 is adjusted. Since it is set in the tone table 31A, it is possible to achieve both luminance improvement and accurate gradation expression by simultaneous light emission of a plurality of color semiconductor light emitting elements.

  In the above embodiment, since the actual luminance time characteristic of each color light emitting element is measured using the luminance sensor 28 and appropriate gradation modulation data is read and set, the secular change and individuality of the semiconductor light emitting element are determined. Considering the difference, more accurate gradation expression can be realized.

  In particular, in the above embodiment, since the position of the luminance sensor 28 is arranged at a position where the so-called off-light that is off the optical axis direction for image projection reaching the projection lens unit 17 is irradiated, the luminance of each color light source When measuring the time characteristic, it is only necessary to stop the image emitted from the projection lens unit 17 for a very short time, and it is possible to avoid projecting an unnecessary image for measurement, and to minimize the influence on the normal projection operation. be able to.

  In the above-described embodiment, a period for projecting a complementary color image by mixing two primary colors as in the Ye field is provided. In such a complementary color period, R, G, and B3 colors are simultaneously emitted to emit a luminance image. Compared with the W field period for projecting the image, the influence of the gradation error per color is large, and color misregistration is easily recognized. However, in the above embodiment, even when such a complementary color period is provided, the luminance time characteristic of each light source to be used is accurately grasped, and the simultaneous light emission period is not only used as a gray gradation, but also a complementary color gradation. It is possible to realize fine gradation expression that can be used for expression.

  This point is not limited to the Ye field, but a Cy (cyan) field that simultaneously emits a B (blue) light source and a G (green) light source, and a R (red) light source and a B (blue) light source that emit light simultaneously. The same effect can be obtained when an Mg (magenta) field is provided.

  Although not described in the above embodiment, not only the brightness of the projected image is measured by the brightness sensor 28, but also the brightness time characteristics of each of the expected light emitting elements of a plurality of colors are stored in the program memory 31 in advance. The gradation modulation data may be adjusted by referring to the data.

  By adopting such a configuration, it is possible to easily realize an accurate gradation expression based on the luminance time characteristic in response to a change in the field configuration and a change in its timing.

  Further, it is assumed that the temperatures of the light source elements LD18, LED26, and LED27 are detected, and a plurality of luminance time characteristics associated with changes in temperature (band) detected in advance are stored in the program memory 31, and the detected light source The stored luminance time characteristic may be switched based on the temperature of each element, and the gradation value for each light source element may be adjusted.

  With such a configuration, it is possible to easily cope with a change in luminance time characteristics accompanying a temperature change around the light source element.

  In addition, the said embodiment uses about LD26 which emits blue light for the light source for excitation for exciting green light using a fluorescent substance, LED26 which emits red light, and LED27 which emits blue light are used about the structure As described above, the present invention is not limited to such a configuration, but can be applied to various projection apparatuses using semiconductor light emitting elements.

  In the above embodiment, the calibration operation is periodically performed. However, the calibration operation may be performed once prior to normal projection.

  In the above embodiment, the field configuration projection apparatus having only the Ye period as the complementary color simultaneous lighting period has been described. However, the field configuration projection apparatus having the Cy or Mg period as the complementary color simultaneous lighting period is also described. Needless to say, the present invention is applicable.

  In the above-described embodiment, an example of a semiconductor light emitting element such as an LD or an LED has been described as the light emitting element. However, the present invention is not limited to this, and the present invention can be applied to a light emitting element having luminance time characteristics.

  In addition, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention in the implementation stage. Further, the functions executed in the above-described embodiments may be combined as appropriate as possible. The above-described embodiment includes various stages, and various inventions can be extracted by an appropriate combination of a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the effect is obtained, a configuration from which the constituent requirements are deleted can be extracted as an invention.

Hereinafter, the invention described in the scope of claims of the present application will be appended.
According to the first aspect of the present invention, a light source capable of emitting light by adjusting the luminance of each color light-emitting element for each color, a driving unit that controls light emission or extinction of the light-emitting element for each color, and a plurality of light sources by the driving unit. An adjustment unit that adjusts the gradation modulation values of the plurality of colors based on a luminance time characteristic with a lapse of time from the start of light emission in a simultaneous light emitting period in which light emitting elements of colors are simultaneously emitted, and an input unit that inputs an image signal And a light modulation unit that spatially modulates light from the light source based on an image signal input by the input unit in accordance with the gradation modulation value adjusted by the adjustment unit, and a light modulation unit And a projection means for emitting and projecting the optical image formed in (1).

  According to a second aspect of the present invention, in the first aspect of the present invention, the apparatus further comprises a luminance measuring unit that measures luminance time characteristics for each color of the light emitting elements of the plurality of colors, and the adjusting unit includes the luminance measuring unit. The gradation modulation values of the plurality of colors are adjusted based on the luminance time characteristics of the light emitting elements of the plurality of colors measured for each color.

  According to a third aspect of the invention, in the second aspect of the invention, the luminance measuring means measures luminance time characteristics using light emitted from the light modulating means in a direction different from the direction of the projecting means. It is characterized by doing.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the two-color light emitting elements that emit primary color light are driven during the simultaneous light emission period.

  According to a fifth aspect of the invention, in the invention according to any one of the first to fourth aspects, the apparatus further comprises storage means for storing the luminance time characteristics of each of the light emitting elements of the plurality of colors, and the adjustment means is the storage means. The gradation modulation values of the plurality of colors are adjusted based on luminance time characteristics of the light emitting elements of the plurality of colors stored by the means.

  The invention described in claim 6 further comprises temperature detecting means for detecting the temperature of each of the light emitting elements of the plurality of colors in the invention described in claim 5, wherein the storage means has a luminance time characteristic corresponding to the temperature. A plurality of storages, and the adjustment unit switches the luminance time characteristics stored in the storage unit based on the temperature for each color of the plurality of light emitting elements detected by the temperature detection unit, and The gradation modulation value is adjusted.

  The invention according to claim 7 is a light source capable of emitting light by adjusting the luminance of each color light emitting element for each color, a drive unit for controlling light emission or extinction of the light emitting element for each color, and an input unit for inputting an image signal A light modulation unit that spatially modulates light from the light source based on an image signal input from the input unit to form a light image, and a projection unit that emits and projects the light image formed by the light modulation unit. A projection method using the apparatus provided with the gradation of the plurality of colors based on a luminance time characteristic with a lapse of time from the start of light emission in a simultaneous light emitting period in which the driving unit simultaneously emits light of a plurality of colors. It has the adjustment process which adjusts a modulation value, It is characterized by the above-mentioned.

  The invention according to claim 8 is a light source capable of emitting light by adjusting the luminance of each color light emitting element for each color, a drive unit for controlling light emission or extinction of the light emitting element for each color, and an input unit for inputting an image signal A light modulation unit that spatially modulates light from the light source based on an image signal input from the input unit to form a light image, and a projection unit that emits and projects the light image formed by the light modulation unit. A program executed by a computer incorporated in the apparatus provided, wherein the computer has a luminance time characteristic with a lapse of time from the start of light emission in a simultaneous light emission period in which a plurality of light emitting elements are simultaneously emitted by the drive unit. Based on this, it functions as an adjusting means for adjusting the gradation modulation values of the plurality of colors.

  DESCRIPTION OF SYMBOLS 10 ... Data projector apparatus, 11 ... Input part, 12 ... Image conversion part, 12A ... Gradation conversion part, 13 ... Projection process part, 14 ... Micromirror element, 15 ... Light source part, 16 ... Mirror, 17 ... Projection lens part 18 ... (for blue light emission) LD, 19 ... mirror, 20 ... dichroic mirror, 21 ... fluorescent wheel, 21g ... phosphor layer, 22 ... wheel motor (M), 23 ... dichroic mirror, 24 ... integrator, 25 ... mirror 26 ... (for red light emission) LED mirror, 27 ... (for blue light emission) LED, 28 ... luminance sensor, 29 ... CPU, 30 ... main memory, 31 ... program memory, 31A ... gradation table, 32 ... operation unit, 33 ... Audio processing unit, 34 ... Speaker unit, 41-53 ... Lens, SB ... System bus.

Claims (9)

A light source capable of emitting light by adjusting the brightness of each color light-emitting element for each color;
Driving means for controlling light emission or extinction of the light emitting element for each color;
Adjusting means for adjusting gradation modulation values of a plurality of colors of the light source based on a luminance time characteristic with the passage of time from the start of light emission in a simultaneous light emission period in which light emitting elements of a plurality of colors are simultaneously emitted by the driving unit;
A projection apparatus comprising: An input means for inputting an image signal;
A light modulation means for forming an optical image of the light from the light source based on image signals input on fill force means by spatially modulated according to the gradation modulation value adjusted by the adjustment means,
The projection apparatus according to claim 1, further comprising a projection unit that emits and projects a light image formed by the light modulation unit. Further comprising luminance measuring means for measuring luminance time characteristics for each color of the light emitting elements of the plurality of colors,
3. The projection according to claim 2, wherein the adjusting unit adjusts the gradation modulation values of the plurality of colors based on luminance time characteristics for each color of the plurality of light emitting elements measured by the luminance measuring unit. apparatus.   4. The projection apparatus according to claim 3, wherein the luminance measuring unit measures luminance time characteristics using light emitted from the light modulating unit in a direction different from the direction of the projecting unit.   5. The projection apparatus according to claim 1, wherein the two-color light emitting elements that emit primary color light are driven during the simultaneous light emission period. Further comprising storage means for storing the luminance time characteristics of each of the light emitting elements of the plurality of colors,
6. The adjustment unit according to claim 1, wherein the adjustment unit adjusts the gradation modulation values of the plurality of colors based on luminance time characteristics of the light emitting elements of the plurality of colors stored in the storage unit. The projection device described. Further comprising temperature detecting means for detecting the temperature of each of the light emitting elements of the plurality of colors,
The storage means stores a plurality of luminance time characteristics corresponding to the temperature,
Said adjustment means switches the luminance time characteristic be stored in the storage means based on the temperature of each color of the plurality of colors of the light-emitting element detected by the temperature detecting means, adjusting the gradation modulation values of said plurality of colors The projection apparatus according to claim 6. A projection method in a device including a light source capable of emitting light by adjusting luminance for each color of light emitting elements for each color, and a driving unit for controlling light emission or extinction of the light emitting elements for each color,
An adjustment step of adjusting the gradation modulation values of the plurality of colors of the light source based on a luminance time characteristic with a lapse of time from the start of light emission in a simultaneous light emission period in which the light emitting elements of the plurality of colors are simultaneously emitted by the driving unit; A projection method characterized by that. A program executed by a computer built in a device having a light source capable of emitting light by adjusting brightness for each color light-emitting element and a light-emitting element for each color, and controlling a light emission or extinction of the light-emitting element for each color,
The computer
Functions as an adjustment means for adjusting the gradation modulation values of the plurality of colors of the light source based on the luminance time characteristics with the passage of time from the start of light emission in the simultaneous light emission period in which the light emitting elements of the plurality of colors are simultaneously emitted by the driving unit. A program characterized by letting

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