TWI446095B - Projecting device, projecting method and program - Google Patents

Description

Projection device, projection method and program [Reciprocal Reference of Related Applications]

The present application claims priority based on Japanese Patent Application No. 2011-070007, filed on March 28, 2011, the entire disclosure of which is hereby incorporated herein by reference. for reference.

The present invention relates to a projection apparatus, a projection method, and a recording medium which are applied to a projector such as a DLP (Digital Light Processing) system.

Since the white light from the light source has been transmitted through the color wheel having the multicolor color filter disposed on the circumferential surface, the color light is emitted as time-division colored light, and the image for each color is projected by the light. Projectors that project color images onto color field sequences have various proposals and are finished.

In the case of a discharge lamp of a high-pressure mercury lamp or the like which has been used in many cases, it is considered to use an LED (light-emitting diode) or LD which is excellent in power consumption, size, heat generation, and the like. A semiconductor light emitting element such as a laser diode.

When such a semiconductor light-emitting element is used as a light source for a projector, since the semiconductor light-emitting element itself basically emits light at a single wavelength, it is necessary to use a plurality of types of semiconductor light-emitting elements having different emission wavelengths.

Further, when a plurality of types of semiconductor light-emitting elements having different light-emitting wavelengths are used, it is necessary to obtain between various types of semiconductor light-emitting elements. Luminance balance. Therefore, as disclosed in Japanese Laid-Open Patent Publication No. 2010-152326, a technique has been devised in which the chromaticity of the light source light in the color sequential mode can be accurately maintained in the set content.

In the technique disclosed in the above patent document, the brightness of each color is measured by an illuminance sensor, and the brightness of each color is adjusted based on the measurement result so that the cumulative chromaticity reaches the target chromaticity.

However, the wavelength of the light emitted by the semiconductor light source element varies with temperature, and the sensitivity of the illuminance sensor also varies with the incident wavelength. Therefore, once the temperature of the semiconductor element belonging to the light source changes, even if the level of its output is the same, the value detected by the illuminance sensor changes. As a result, the color balance of the projected image is destroyed.

A projection device according to the present invention includes: a plurality of semiconductor light-emitting elements having different emission wavelengths; an input unit for inputting an image signal; and an optical image forming unit configured to emit light from the semiconductor light-emitting element to form an input corresponding to the input a light image of the input image signal; a projection unit that projects the light image formed by the light image forming unit toward the projection target; and a temperature detecting unit that detects a temperature when the semiconductor light emitting element emits light according to the type; the measuring unit And measuring the intensity of light when illuminating according to the type of the semiconductor light-emitting device; and The light emission control unit corrects the measurement result of the measurement unit using the detection result of the temperature detection unit, and controls the intensity of the light emission of each of the semiconductor light-emitting elements based on the corrected measurement result.

Further, the projection method of the present invention employs a projection method of a device having a plurality of types of semiconductor light-emitting elements having different emission wavelengths; an input portion for inputting an image signal; and an optical image forming portion for emitting light by the semiconductor light-emitting element. Obtaining a light source to form a light image corresponding to the image signal input to the input unit; and a projection unit projecting the light image formed in the light image forming unit toward the projection object, wherein the temperature detecting step is performed on the light source The semiconductor light emitting device detects the temperature at the time of light emission according to the type; the measuring step of measuring the intensity of the light when the light is emitted by the semiconductor light emitting element; and the light emission controlling step of correcting the above measurement using the detection result of the temperature detecting step The measurement result of the step controls the intensity of the light emission of each of the semiconductor light emitting elements based on the corrected measurement result.

Further, the recording medium of the present invention is executed by a computer built in a device having the following items: a plurality of types of semiconductor light-emitting elements having different emission wavelengths; an input portion for inputting an image signal; and an image formation a light source obtained by emitting light from the semiconductor light emitting element, forming a light image corresponding to the image signal input to the input unit, and a projection unit projecting the light image formed in the light image forming unit toward the projection target The computer has a function of detecting a temperature at which the semiconductor light-emitting device emits light according to the type of the semiconductor light-emitting device, and a measuring unit that measures the intensity of light when the light-emitting device is emitted by the semiconductor light-emitting device; The control unit corrects the measurement result of the measurement unit using the detection result of the temperature detection unit, and controls the emission intensity of each of the semiconductor light-emitting elements based on the corrected measurement result.

The advantages of the present invention will be described in the following description, and a part thereof will be apparent from the description or may be made by the embodiments of the present invention. The advantages of the present invention can be understood and obtained by the means and combinations particularly pointed out below.

Embodiments of the invention will be described with reference to the drawings.

Hereinafter, the present invention will be described with reference to the drawings in one embodiment of the case of a data projector device suitable for the DLP (registered trademark) system.

Fig. 1 is a view showing a schematic functional configuration of a data projector device 10 of the present embodiment.

The input unit 11 is constituted by, for example, a pin jack (RCA) type video input terminal, a D-sub15 type RGB input terminal, or the like. The analog video signals of various specifications input to the input unit 11 are digitized by the input unit 11, and then transmitted to the video conversion unit 12 via the system bus SB.

The image conversion unit 12 is also referred to as a scaler, and the input image data can be unified into image data of a predetermined format suitable for projection and transmitted to the projection processing unit 13.

At this time, data such as symbols indicating various operational states of the OSD (On Screen Display) are superimposed and processed into image data by the image conversion unit 12 as needed, and the processed image data is transmitted to the projection processing unit 13 . .

The projection processing unit 13 drives the transmitted image data by a higher-speed time-divisional drive by multiplying the frame rate of the predetermined format, for example, 60 [frames/second], the number of divisions of the color components, and the number of display grayscales. The micromirror element 14 of the spatial optical modulation element is driven for display.

The micromirror device 14 performs switching operation and displays images by a plurality of high-definition individual-matrix arrays, for example, WXGA (Wide eXtended Graphic Array) (tiling 1280 pixels × 800 pixels long). The light image is formed by the reflected light.

Further, the R, G, and B primary color lights are cyclically emitted by the light source unit 15 in a time-sharing manner. The primary color light from this source light 15 is totally reflected by the mirror 16 and is incident on the above-described micromirror element 14.

Thereafter, a light image is formed by the reflected light on the micromirror device 14, and the formed light image is projected and displayed on the screen of the unillustrated image as a projection target via the projection lens unit 17.

The light source unit 15 has 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 spectroscopic wheel 20, and is irradiated to the circumferential surface of the fluorescent ring 21. The fluorescent ring 21 is rotated by the rim motor (M) 22, and a phosphor layer 21g is formed on the entire circumference of the circumferential surface illuminated by the blue laser light.

More specifically, the phosphor layer 21g is formed by coating a phosphor on the circumference irradiated with the above-described laser light of the fluorescent ring 21. In formation The back surface of the surface of the phosphor layer 21g of the fluorescent ring 21 is disposed such that the reflecting plate and the phosphor layer 21g overlap each other.

By irradiating the blue laser light to the phosphor layer 21g of the fluorescent ring 21, green light (G) can be excited as reflected light. The green light is reflected by the spectroscopic wheel 20, and is also reflected by the spectroscopic wheel 23. The integrator 24 forms a beam having a uniform luminance distribution, and is reflected by the mirror 25 to reach the mirror 16.

Further, the light source unit 15 has 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 spectroscopic wheel 20, is reflected by the spectroscopic wheel 23, and a light beam having a uniform luminance distribution is formed by the integrator 24, and then reflected by the mirror 25 to reach the mirror. 16.

The blue light (B) emitted from the LED 27 passes through the spectroscopic wheel 23, and a beam having a uniform luminance distribution is formed via the integrator 24, and is reflected by the mirror 25 to reach the mirror 16.

As described above, the spectroscopic wheel 20 can penetrate blue light and red light and reflect green light. The beam splitter wheel 23 allows blue light to pass through while reflecting green light and red light.

In the present embodiment, the operation of dividing the reflected light by the micromirror device 14 causes the light that is not reflected in the direction of the projection lens unit 17, that is, the "closed light" to be incident on the illuminance sensing unit as the measuring portion. 28 The illuminance sensor 28 can measure the illuminance of the incident light, which will be detailed later, and display the signal Ilm of the photometric measurement result of the light during the R color field, and display the photometric measurement of the light during the G color field. Result signal IIlm, display The IIIlm of the light measurement result in the B color field period is output to the above-described projection processing unit 13.

Further, the LD 18 is provided with a temperature sensor 29 as a temperature detecting unit while avoiding the light emitting direction. Similarly, for the LED 26, the temperature sensor 30 is attached to avoid its light emitting direction. The temperature sensor 31 is attached to the LED 27 in keeping with its light emitting direction.

The projection processing unit 13 can perform formation of an optical image displayed by the image of the micromirror device 14 under the control of the CPU 34, which will be described later, light emission of the LD 18, the LEDs 26, and 27, and a fluorescent ring using the rim motor 22 described above. Rotation of 21; driving of motor (M) 32 of rotating spectroscopic wheel 20; driving of motor (M) 33 rotating said spectroscopic wheel 23; and measurement of illuminance by said illuminance sensor 28 and utilization of said temperature Detection of the temperature of each of the light sources of the sensors 29 to 31.

The actions of the above circuits are all controlled by the CPU 34. The CPU 34 is directly connected to the main memory 35 and the program memory 36. The main memory 35 can be constituted by, for example, an SRAM, and functions as a working memory of the CPU 34. The program memory 36 is composed of an electrically rewritable non-volatile memory, and stores an operation program executed by the CPU 34 or various types of fixed data. The CPU 34 executes the control operation in the data projector device 10 using the main memory 35 and the program memory 36 described above.

The CPU 34 executes various projection operations due to the key operation signal from the operation unit 37.

The operation unit 37 includes a key operation unit provided in the main body of the data projector device 10, and an infrared infrared light receiving unit that receives an infrared light from a remote controller (not shown) dedicated to the data projector device 10; The button operation signal generated by the user at the button operation portion of the main body or the button operated by the remote controller is directly output to the CPU 34.

The CPU 34 is further connected to the audio processing unit 38 via the system bus SB. The audio processing unit 38 includes a sound source circuit such as a PCM sound source, and can classify the audio data given during the projection operation, drive the speaker unit 39, and expand the sound, or generate a voice or the like as needed.

Next, a specific configuration example of the optical system including the light source unit 15 and the micromirror device 14 and the projection lens unit 17 will be described with reference to FIG. 2 .

In Fig. 2, the LD 18 is composed of a plurality of, for example, 8×4 (paper direction) Arrays of 24 matrixes arranged in a matrix, and the blue laser light emitted by the individual light emission is reflected by the mirror 19, and the mirror 19 is reflected. It is composed of the same number of mirrors arranged in a matrix array array with step differences. .

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

The green light excited by the phosphor layer 21g of the fluorescent ring 21 is reflected by a reflecting plate which is provided on the back surface of the face of the phosphor ring 2 on which the phosphor layer 21g is formed, and is split by the lenses 43 and 44. The mirror wheel 20 reflects, passes through the lens 45, and is reflected by the beam splitter wheel 23.

The green light reflected by the beam splitter wheel 23 is reflected by the mirror 46, the integrator 24, and the lens 47, and then reaches the mirror 16 via the lens 48.

The green light reflected by the mirror 16 is illuminated by the lens 49 to the micromirror element 14, where the micromirror element 14 forms a light image of the corresponding color. The formed light image is emitted to the projection lens unit 17 side via the lens 49 described above.

Further, the red light emitted from the LED 26 penetrates the spectroscopic wheel 20 via the lenses 50, 51, and is reflected by the spectroscopic wheel 23 via the lens 45.

The blue light emitted from the LED 27 penetrates the above-described beam splitter wheel 23 via the lenses 52, 53.

Next, the operation of the above embodiment will be described.

Further, as described above, the operations shown below are executed after the CPU 34 decompresses and stores the operation program or fixed data read from the program memory 36 in the memory 35.

Moreover, in order to simplify the description, when one frame of a color image is projected, for example, a frame of R (red), G (green), W (white), and B (blue) is used to form the frame and project the color. image. In the W (white) color field, all the green light LD 18, the red light LED 26, and the blue light LED 27 are simultaneously illuminated, and the corresponding luminance signal Y is displayed in the micromirror device 14 (Y=0.299R+0.587). Image of G+0.114B).

Fig. 3 is a flow chart showing the main processing contents of the light source color balance correction performed while the power of the data projector device 10 is turned on.

When the power is turned on, after performing the normal projection operation of the optical image corresponding to the image signal input from the input unit 11 formed by the micromirror device 14 and using the light from the light source unit 15 to be projected by the projection lens unit 17 ( In step S101), the CPU 34 determines whether the next frame timing is available for color balance correction of the light source (step S102).

The frame timing for performing color balance correction of this light source is, for example, 1 hour, and if the frame rate is 60 [frames/second], it is performed at a frequency of 216,000 frames.

If it is determined that the next frame timing is not used for color balance correction of the light source, the CPU 34 determines in step S102 and returns to the processing from step S101 again.

As described above, by repeating the processing of steps S101 and S102, the CPU 34 waits for the frame timing for performing the color balance correction of the light source when performing the processing related to the normal projection operation.

If the next frame timing is available for color balance correction of the light source, the CPU 34 determines in the above step S102 that the color field is always black during the display of the color field in the R color field at the front end of the successive one frame. The image is imaged and projection is performed (step S103).

Fig. 4 is a view showing the operation timing between one frame during image projection for performing color balance correction of the light source. As shown in the diagram (A), the one frame is composed of four color regions of the R color field, the G color field, the W color field, and the B color field. In order to simplify the explanation, the lengths of the respective color field periods in the illustration are set to be equal.

As shown in Fig. 4(B), the red light-emitting LED 26 is driven by the projection processing unit 13 to emit light in each of the R color field and the W color field.

As shown in Fig. 4(C), the LD 18 for emitting green light and emitting blue light is driven by the projection processing unit 13 to emit light in each of the G color field and the W color field.

As shown in Fig. 4(D), the blue light-emitting LED 27 is driven by the projection processing unit 13 to emit light during two consecutive color fields of the W color field and the B color field.

Further, in the R color field, as shown in Fig. 4(E), the position of the peripheral surface of the sector which is irradiated with the red light from the LED 26 of the spectroscopic wheel 20 is a transparent member or a slit such as a transparent glass or an acrylic resin. The red light from the LED 26 is penetrated without loss with an efficiency of almost 100 [%].

Further, as shown in Fig. 4(F), the mirror surface is irradiated with the red light of the LED 26 from the spectroscopic wheel 23, and the mirror is formed, and the spectroscope is penetrated without loss with an efficiency of almost 100 [%]. The red light from the LED 26 of the wheel 20 is totally reflected.

As a result of displaying the image which is all black in the above-described step S103, the reflected light on the entire surface of the micromirror device 14 is turned off as light, and is projected onto the light absorbing portion (not shown) for non-projection in which the illuminance sensor 28 is disposed. Instead of the projection lens portion 17. A black heat resistant coating is applied to this portion, which does not reflect the closed light but is used to absorb and convert it into heat.

The CPU 34 causes the projection processing unit 13 to measure the illuminance Ilm by the illuminance sensor 28 at the timing substantially at the center of the R color field, and the projection processing unit 13 detects the same at the same time as the temperature sensor 30. The temperature ThR of the light-emitting LED 26 is timed (step S104).

The CPU 34 corrects the illuminance Ilm of the illuminance sensor 28 acquired via the projection processing unit 13 based on the temperature ThR of the LED 26 detected by the temperature sensor 30, which is also acquired via the projection processing unit 13, thereby obtaining the correct illuminance of the LED 26, and based on The obtained illuminance and the current value driven at this time point calculate the output adjustment value of the LED 26, specifically, the drive current value (step S105).

Fig. 5 shows the relationship between the light output of the LD and the LED and the light receiving value of the illuminance sensor that receives the light. In the same figure, for the temperature Th of the LD and the LED indicated by the solid line, the same characteristic in the case where the temperature is high (Th+) is indicated by a dotted line, and the same characteristic in the case where the temperature is low (Th-) is indicated by a broken line. In general, the higher the temperature of the semiconductor light emitting element, the higher the wavelength of the light. The longer the frequency (lower frequency) is shifted, and even if the light output of the illuminated light source is the same, the longer the wavelength, the higher the sensitivity of the illuminance sensor, and the higher the illuminance measurement result.

In other words, when the temperature of the semiconductor light-emitting device is higher, the light-emitting wavelength is shifted in the longer direction, and the light-emitting output of the LD and the LED and the linear slope of the light-receiving value of the illuminance sensor receiving the light are shown in FIG. That is, the differential coefficient of the above straight line becomes larger.

Considering this property, the CPU 34 corrects the measurement result of the illuminance sensor 28 based on the detection result ThR of the temperature sensor 30, whereby the correct illuminating output of the LED 26 can be known, and the adjusted value, that is, the correct driving current can be calculated. value.

For example, a calculation formula (Formula 1) for obtaining a semiconductor light-emitting element illuminance correction value by using the measurement result of the illuminance sensor 28 and the measurement result by the temperature sensor 30 is used in advance. The calculus is pre-stored in the program memory.

Y ' =f(Y, ThR) (Math 1)

(Y ' : illuminance value after semiconductor light-emitting element correction, Y: measurement result of illuminance sensor 28, ThR: detection result of temperature sensor 30)

Next, the CPU 34 reads out the above-described correction formula stored in advance based on the actual measurement result ThR of the temperature sensor 30 to correct the measurement result of the illuminance sensor 28.

Further, the program memory stores the calculation formula in advance, and calculates the drive current value required to cause the semiconductor light-emitting element to emit light with the corrected illuminance value from the calculated value of the semiconductor light-emitting element illuminance correction and the drive current value of the semiconductor light-emitting element.

i'=f(Y', i) (Math 2)

(i: drive current value applied to the semiconductor light-emitting element, i': drive current value required to cause the semiconductor light-emitting element to emit light with the corrected illuminance value)

Next, the CPU 34 measures the drive current value of the semiconductor light emitting element at the measurement timing based on the actual detection result ThR of the temperature sensor 30, and reads out the above-described mathematical expression 2 to correct the drive current value.

Further, for example, a calculation formula (Formula 3) may be used in advance, which uses the measurement result of the illuminance sensor 28, the measurement result of the temperature sensor 30, and the drive current value applied to the semiconductor light-emitting element. And get the coefficient A for illuminance correction, which can be stored in the program memory first.

A=f(Y, ThR, i) (Math 3)

(A: coefficient for illuminance correction)

Next, the CPU 34 stores in advance an arithmetic expression for calculating the drive current value required to cause the semiconductor light-emitting element to emit light with the corrected illuminance value from the coefficient A obtained in the above Equation 3 and the drive current value of the semiconductor light-emitting element.

i'=f(A,i) (Math 4)

Next, the CPU 34 reads out the above-described Mathematical Formula 4 which is stored in advance at the time of correction and corrects the drive current value.

Thereafter, the CPU 34 displays the image that is always black in the color field during the color field period and performs projection in the same manner as the G color field of the R color field (step S106).

In this G color field, as shown in FIG. 4(E), the blue light of the LD 18 from the spectroscopic wheel 20 is irradiated by the mirror 19 by the GRM, that is, by red (R) and The blue (B) light is transmitted through the spectroscopic wheel that reflects the green (G) light, and the blue light from the LD 18 is transmitted through and irradiated to the phosphor layer 21g of the fluorescent ring 21, and then reflected on the phosphor layer. 21 g of the excited green light is emitted toward the spectroscopic wheel 23.

Further, as shown in Fig. 4(F), a mirror is formed on the circumferential surface of the spectroscopic wheel 23 illuminated by the green light, and the spectroscopic wheel 20 is totally reflected without loss with an efficiency of almost 100 [%]. Reflected green light.

As a result of the all-black image being displayed in the above-described step S106, the reflected light on the entire surface of the micromirror device 14 is turned off, and is projected onto a light absorbing portion (not shown) for non-projection in which the illuminance sensor 28 is disposed. Rather than the projection lens portion 17. A black heat resistant coating is applied to this portion, which does not reflect the closed light but is used to absorb and convert it into heat.

At the timing of the substantially central position of the G color field during the CPU 34, the illumination sensor 28 causes the projection processing unit 13 to measure the illuminance IIlm, and the temperature sensor 29 similarly causes the projection processing unit 13 to detect the time-point illumination. The temperature of the LD 18 is ThG (step S107).

The CPU 34 corrects the illuminance IIlm of the illuminance sensor 28 acquired via the projection processing unit 13 based on the temperature ThG of the LD 18 detected by the temperature sensor 29, which is also acquired via the projection processing unit 13, thereby obtaining the correct illuminance of the LD 18, and based on The obtained illuminance and the current value driven at this time point are used to calculate an output adjustment value of the LD 18, specifically, a drive current value (step S108).

Thereafter, the CPU 34 connects the W color field of the G color field, and causes the LD 18, the LED 26, and the LED 27 to emit light, and performs normal projection of the luminance image by the micromirror device (step S109).

In the W color field, as shown in FIG. 4(E), the position of the circumferential surface of the spectroscopic wheel 20 illuminated by the LD 18 via the mirror 19 is the same as the previous G color field by the GRM, that is, It is composed of a spectroscopic wheel that transmits red (R) and blue (B) light and reflects green (G) light.

Therefore, the blue light of the LD 18 is penetrated and irradiated to the phosphor layer 21g of the fluorescent ring 21, and the green light excited by the phosphor layer 21g is reflected and emitted toward the spectroscopic wheel 23.

Also, at the same time, the red light from the LED 26 passes through the spectroscopic wheel 20 and reaches the spectroscopic wheel 23.

Further, as shown in Fig. 4(F), the circumferential position of the spectroscopic wheel 23 illuminated by the red light and the green light is BTM, that is, red (R) and green (G) light are reflected and blue (B) The light-transmitting spectroscopic wheel is configured to reflect blue light from the LED 27 while reflecting red light from the LED 26 and green light from the phosphor layer 21g.

Therefore, white light mixed with red light, green light, and blue light is irradiated onto the micromirror device 14, and a luminance image is formed by the luminance image displayed by the micromirror device 14, and is projected toward the projection by the projection lens portion 17. Subject radiation.

Thereafter, the CPU 34 successively displays the B-color field of the W color field, and again displays the image which is always black in the color field period by the micromirror device 14 and performs projection (step S110).

In this B color field, the LED 27 is driven to emit light, and as shown in FIG. 4(F), the peripheral surface of the spectroscopic wheel 23 irradiated with the blue light is irradiated to form a transparent member or a slit of transparent glass or acrylic resin. The blue light from the LED 27 is penetrated without loss with an efficiency of almost 100 [%].

As a result of the all-black image being displayed in the above-described step S110, the reflected light on the entire surface of the micromirror device 14 is turned off as light, and is projected onto a light absorbing portion (not shown) for non-projection in which the illuminance sensor 28 is disposed. Instead of the projection lens portion 17. A black heat resistant coating is applied to this portion, which does not reflect the closed light but is used to absorb and convert it into heat.

The CPU 34 causes the projection processing unit 13 to measure the illuminance IIlm by the illuminance sensor 28 at the timing substantially at the center of the B color field period, and the projection processing unit 13 detects the same at the same time as the temperature sensor 31. The temperature ThB of the light-emitting LED 27 is timed (step S111).

The CPU 34 corrects the illuminance IIIlm of the illuminance sensor 28 acquired via the projection processing unit 13 based on the temperature ThB of the LED 27 detected by the temperature sensor 31, which is also acquired via the projection processing unit 13, thereby obtaining the correct illuminance of the LED 27, and based on The obtained illuminance and the current value driven at this time point are calculated as the output adjustment value of the LED 27, specifically, the drive current value (step S112).

In the above, based on the calculation of the individual new drive current values of the three-color light source, the CPU 34 sets the respective drive current values of the red light LED 26 and the LD 18 and the blue light LED 27 for exciting the green light to the projection processing unit ( Step S113), the above completes the color balance correction of the light source One of the series of processing is related, and in order to prepare for the next color balance correction processing, the processing from the above-described step S101 is returned.

Figures 6A to 6D show the concept of color balance correction based on the processing of the above Fig. 3.

Fig. 6A shows the output of each color when the R, G, and B3 colors are simultaneously illuminated to obtain a correct white color. As shown in the figure, by making the output of each of the R, G, and B colors balanced, as a result, the color mixture is white, and the image projection under the correct color balance can be achieved.

The next 6B diagram illustrates the individual measurement results of the R, G, and B colors measured by the illuminance sensor 28. As shown in the figure, in Fig. 6B, since the respective measurement results of R, G, and B on the outer surface are balanced, it can be seen that their color mixture, that is, white, can also obtain the correct color temperature as set.

However, with respect to the measurement results in the above FIG. 6B, the correct illuminance size is shown in FIG. 6C as a result of the correction by the temperature detected by each light source. As described above, by correcting based on the temperature of the semiconductor light-emitting element constituting each light source, it is possible to obtain a wavelength shift due to temperature and a correct illuminance balance of each color corrected by the sensitivity change of the illuminance sensor 28.

Therefore, by calculating and setting the drive current value for adjusting each light source from the above-described correction result, as shown in FIG. 6D, it is possible to cause the respective color light sources to emit light with an emission intensity that is not substantially externally but substantially correct in color balance.

As described in detail above, according to the present embodiment, even if the temperature of the semiconductor light-emitting elements such as the LD 18, the LEDs 26, and 27 constituting the light source changes, the color balance can be prevented and the correct color tone can be maintained.

Further, in the above-described embodiment, by arranging the illuminance sensor 28 at the irradiation position of the closed light, the light image formed by the micromirror device 14 and used for projection by the projection lens portion 17 can be prevented from being affected. Next, the illuminance of the light source that is irradiated to the micromirror device 14 is detected.

Then, in the above-described embodiment, in the series of processes related to the color balance correction of the light source, the image is displayed as a black image by the micromirror device 14 in each color field of R, G, and B, which is only a 1-color frame. The human eye is almost indistinguishable visually, but even if it is small, in order to avoid interruption of the projected image, measurement, detection, and the like are not performed in the W color field set in the middle of the frame, but the luminance image is displayed by the micromirror device 14 and projected from the projection. Since the lens unit 17 projects it, it is possible to eliminate a slight interruption of the projected image and continue the smooth projection operation.

At this point, the color field of the normal frame projection in the middle of the frame is not limited to the W color field, but is performed in a relatively bright Y (yellow) color field, and can also emit semiconductor light emitting red (R) light. The element emits light simultaneously with the semiconductor light emitting element that emits green (G) light.

Further, in the above-described embodiment, the illuminance measurement and the temperature detection of the respective color light source elements are performed at the timings of the R, G, and B color field centers, so that the average illuminance measurement and the average light source temperature of each color field can be performed. Detection and ability to make more correct corrections.

Further, although the data projector device 10 of the present embodiment uses a rotating beam splitter wheel and guides each light to the integrator 24, it is reasonable to construct it using a fixed and non-rotating beam splitter.

Further, in the above embodiment, although the LED 26 is used to generate red light, the light from the LD 18 is used and the phosphor ring 21 is irradiated to generate green light. The LED 27 is used to generate blue light, but is not limited thereto. For example, LEDs or LDs can be used to generate light of all colors. For example, light irradiated to the fluorescent ring 21 can of course be used to generate green and blue colors. Light.

Further, unlike the above-described embodiment, the lookup table for correcting the illuminance of the light source can be stored in the program memory in advance. For example, a lookup table as shown in FIGS. 7 and 8 is used. Fig. 7 is a schematic diagram of a lookup table for obtaining the correction coefficient used for determining the correction value from the measured value of the light source illumination and the temperature, and Fig. 8 is a diagram showing the driving coefficient determined from Fig. 7 to determine the driving of the red light source LED 26. A schematic diagram of the current value lookup table (R corrected current ir ' table). Further, the look-up tables of Figs. 7 and 8 are described after being simplified for convenience of explanation.

Specifically, the temperature of the red light source, that is, the LED 26 is first measured by the temperature sensor 30, and the illuminance at the time of the measurement is measured by the illuminance sensor 28. Next, in the lookup table of FIG. 7, the red correction coefficient Ar is determined using the obtained temperature and illuminance with reference to the R correction value Ar table. Similarly, the temperature of the LD 18 is measured by the temperature sensor 29, and the illuminance at the time of the measurement is measured by the illuminance sensor 28. Next, in the lookup table of FIG. 7, the green correction coefficient Ag is determined using the obtained temperature and illuminance with reference to the G correction value Ag table. Similarly, the temperature of the LED 27 is measured by the temperature sensor 31, and the illuminance at the time of the measurement is measured by the illuminance sensor 28. Next, in the lookup table of FIG. 7, the B correction value Ab table is referred to, and the blue correction coefficient Ab is determined using the obtained temperature and illuminance.

Next, the drive current value is determined by referring to a lookup table that determines the corrected drive current value of the light source LED 26 as shown in FIG. Specifically, the difference between the red correction coefficient Ar and the green correction coefficient Ag obtained by the lookup table of FIG. 7 is calculated, that is, Ar-Ag, and the difference between the red correction coefficient Ar and the blue correction coefficient Ab is calculated, that is, Ar-Ab . Then, based on the obtained values of Ar-Ag and Ar-Ab, the drive current value ir ' of the LED 26 is set. Further, regarding the LD 18 and the LED 27, the same lookup table is stored first, and the drive current values ig ' and ib ' are set. By correcting the drive current value of the light source by using such a look-up table, even if the temperature of the semiconductor light-emitting elements such as the LD 18, the LEDs 26, and 27 constituting the light source changes, the color tone can be maintained without correcting the color balance.

Those skilled in the art can immediately consider other advantages and modifications. Therefore, the invention in its broader aspects is not intended to Various changes may be made without departing from the spirit and scope of the general inventive concept as defined by the appended claims.

10‧‧‧Data Projector Unit

11‧‧‧ Input Department

12‧‧‧Image Conversion Department

13‧‧‧Projection Processing Department

14‧‧‧Micromirror components

15‧‧‧Light source department

16‧‧‧Mirror

17‧‧‧Projection lens section

18‧‧‧LD

19‧‧‧Mirror

20‧‧‧Splitting wheel

21‧‧‧ fluorescent ring

21g‧‧‧Fluorite layer

22‧‧‧Round Motor

23‧‧‧Splitter wheel

24‧‧‧ integrator

25‧‧‧Mirror

26‧‧‧LED

27‧‧‧LED

28‧‧‧illuminance sensor

29‧‧‧Temperature Sensor

30‧‧‧temperature sensor

31‧‧‧ Temperature Sensor

32‧‧‧Motor (M)

33‧‧‧Motor (M)

34‧‧‧CPU

35‧‧‧ main memory

36‧‧‧Program memory

37‧‧‧Operation Department

38‧‧‧ Audio Processing Department

39‧‧‧Speaker Department

41‧‧‧ lens

42‧‧‧ lens

43‧‧‧ lens

44‧‧‧ lens

45‧‧‧ lens

46‧‧‧ lens

47‧‧‧ lens

48‧‧‧ lens

49‧‧‧ lens

50‧‧‧ lens

51‧‧‧ lens

52‧‧‧ lens

53‧‧‧ lens

B‧‧‧Blue

G‧‧‧Green

Ilm‧‧‧ illumination

Ilm‧‧‧ illumination

IIIlm‧‧‧ illumination

M‧‧·Ring Motor

R‧‧‧Red

SB‧‧‧ system bus

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in the claims

Fig. 1 is a view showing the construction of an electronic circuit and an optical system of a data projector device according to an embodiment of the present invention.

Fig. 2 is a view showing a specific configuration example of an optical system of the same embodiment.

Fig. 3 is a flow chart showing the processing contents of the light source color balance correction performed in conjunction with the projection operation when the power supply of the embodiment is turned on.

Fig. 4(A) to Fig. 4(G) are timing charts showing the contents of the operations of the respective units in the color balance correction of the embodiment.

Fig. 5 is a view showing the relationship between the light-emitting output of the LD and the LED of the embodiment and the light-receiving value of the illuminance sensor that receives the light.

6A to 6D are diagrams showing the concept of color balance correction in the same embodiment.

Fig. 7 is a schematic diagram of a lookup table for obtaining a correction coefficient for determining a correction value from actual measured values and temperature of light source illumination.

Fig. 8 is a schematic diagram of a lookup table for determining the drive current value of the red light source LED 26 from the correction coefficient obtained in Fig. 7.

10‧‧‧Data Projector Unit

11‧‧‧ Input Department

12‧‧‧Image Conversion Department

13‧‧‧Projection Processing Department

14‧‧‧Micromirror components

15‧‧‧Light source department

16‧‧‧Mirror

17‧‧‧Projection lens section

18‧‧‧LD

19‧‧‧Mirror

20‧‧‧Splitting wheel

21‧‧‧ fluorescent ring

21g‧‧‧Fluorite layer

22‧‧‧Round Motor

23‧‧‧Splitter wheel

24‧‧‧ integrator

25‧‧‧Mirror

26‧‧‧LED

27‧‧‧LED

28‧‧‧illuminance sensor

29‧‧‧Temperature Sensor

30‧‧‧temperature sensor

31‧‧‧ Temperature Sensor

32‧‧‧Motor (M)

33‧‧‧Motor (M)

34‧‧‧CPU

35‧‧‧ main memory

36‧‧‧Program memory

37‧‧‧Operation Department

38‧‧‧ Audio Processing Department

39‧‧‧Speaker Department

B‧‧‧Blue

G‧‧‧Green

Ilm‧‧‧ illumination

M‧‧·Ring Motor

R‧‧‧Red

SB‧‧‧ system bus

ThB‧‧‧LED27 temperature

ThG‧‧‧LD18 temperature

ThR‧‧‧LED26 temperature

Claims (11)

A projection apparatus comprising: a first light source that emits excitation light of a predetermined wavelength; and a fluorescent member that emits fluorescence of a wavelength different from the predetermined wavelength by excitation of the excitation light; and the second light source emits Light having a different wavelength from the excitation light and the fluorescent light; the first spectroscopic wheel is disposed on the light emitted by the first light source, the fluorescent light emitted by the fluorescent member, and the light emitted by the second light source a gathering position, and a peripheral portion and a beam splitter portion that allows light emitted from the second light source to pass without being attenuated, the splitting mirror portion being caused by the first light source The emitted excitation light penetrates and reflects the fluorescent light emitted by the fluorescent member; and the rotation driving portion rotates the first beam splitting mirror in synchronization with the time-division illumination driving of the first light source and the second light source An input unit for inputting an image signal; and a light image forming unit that forms a light image corresponding to the image signal input by the input unit by using light reflected or reflected from the first beam splitter wheel; And projecting the light image formed by the light image forming unit toward the projection object; the temperature detecting unit detects a temperature when the first light source and the second light source emit light according to the type; and the measuring unit is configured to the first light source And the second light source, Measuring the intensity of the light when emitting light according to the type; and the light emission control unit correcting the measurement result of the measuring unit by using the detection result of the temperature detecting unit, and controlling the first light source based on the corrected measurement result The luminous intensity of the second light source described above. The projection apparatus of claim 1, wherein the passing portion of the first spectroscopic wheel is constituted by a transparent member or a slit formed in a part of a circumferential surface of the first spectroscopic wheel. A projection device according to claim 1 or 2, comprising: a third light source that emits light of a blue wavelength band; the first light source emits excitation light of a blue wavelength band; and the fluorescent member is excited light Exciting to emit fluorescence in a green wavelength band; the second light source emits light in a red wavelength band; and the light image forming portion emits light that is transmitted or reflected from the first spectroscopic wheel and is emitted by the third light source The light detecting unit forms a light image corresponding to the image signal; the temperature detecting unit detects a temperature at the time of light emission for the first light source, the second light source, and the second light source, and the measuring unit is configured to a light source, the second light source, and the third light source measure the intensity of light when emitting light according to the type; the light emission control unit corrects the measurement result of the measuring unit by using the detection result of the temperature detecting unit, The above-mentioned measurement result of the correction controls the luminous intensity of the first light source and the second light source. The projection device of claim 3, wherein the second spectroscopic wheel is provided with a mirror portion and a passing portion formed on the circumferential surface, wherein the mirror portion is caused by the fluorescent light reflected by the first spectroscopic wheel The fluorescent light emitted from the member and the light emitted from the first light splitting mirror wheel and emitted by the second light source are totally reflected, and the passing portion passes the light emitted from the third light source without being attenuated. The projection apparatus according to claim 1 or 2, wherein the measuring unit measures the intensity of the light by using reflected light that is not reflected in the direction of the projection unit in the light image forming unit. The projection apparatus according to claim 1 or 2, wherein the optical image forming unit is provided with a period in which each of the light sources is emitted in a single type and a period in which a plurality of types are simultaneously emitted, and the measurement is performed by the measuring unit. During the light emission of the single type, a black image is formed, and a light image corresponding to the image signal input by the input unit is formed while a plurality of types are simultaneously illuminated. The projection apparatus according to claim 1 or 2, wherein the temperature detecting unit and the measuring unit perform temperature detection and light intensity at the time of light emission for each of the light sources in accordance with a timing of a substantially central portion of each of the light-emitting periods Measurement. The projection device according to claim 1 or 2, wherein the light emission control unit executes a calculation formula prepared in advance based on a detection result of the temperature detection unit, and corrects the amount of the measurement unit based on a calculation result of the calculation formula After the measurement results, the luminous intensity of each of the above light sources is controlled. The projection device of claim 1 or 2, wherein the above-mentioned hair is The light control unit controls the measurement result of the measurement unit based on the detection result of the temperature detection unit, and corrects the measurement result of the measurement unit, and then controls the light emission intensity of each of the light sources. A projection method is a projection method using a device having a first light source that emits excitation light of a predetermined wavelength, and a fluorescent member that is excited by the excitation light to emit fluorescence having a wavelength different from the predetermined wavelength; The second light source emits light of a different wavelength from the excitation light and the fluorescent light; the first spectroscopic wheel is disposed on the light emitted by the first light source, the fluorescent light emitted by the fluorescent member, and a position at which the light emitted from the second light source is concentrated, and a peripheral portion and a spectroscope portion are formed on the peripheral surface, and the passing portion passes the light emitted from the second light source without being attenuated, and the spectroscopic portion is made The excitation light emitted by the first light source penetrates and reflects the fluorescent light emitted by the fluorescent member; and the rotation driving portion causes the first spectroscopic wheel to emit light with the first light source and the second light source. Driving in synchronization with rotation; inputting an input portion of an image signal; and a light image forming portion forming an image input to the input portion by using light reflected or reflected from the first beam splitter wheel And a projection unit that projects the light image formed by the light image forming unit toward the projection object, and has a temperature detecting step of detecting the light emission by the first light source and the second light source The temperature of the time; the measuring step, which measures the intensity of the light when the light is emitted by the first light source and the second light source; and The illuminating control step corrects the measurement result of the measuring step using the detection result of the temperature detecting step, and controls the illuminating intensity of the first light source and the second light source based on the corrected measurement result. A program is executed by a computer built in a device having: a first light source that emits excitation light of a predetermined wavelength; and a fluorescent member that is excited by the excitation light to emit The second wavelength source emits light of a different wavelength from the excitation light and the fluorescence; the first beam splitter wheel is disposed on the light emitted by the first light source, and the firefly a position where the fluorescent light emitted from the optical member and the light emitted by the second light source are concentrated, and a peripheral portion and a beam splitter portion are formed on the circumferential surface, and the light passing through the second light source is not attenuated. In this case, the spectroscope portion penetrates the excitation light emitted by the first light source and reflects the fluorescent light emitted by the fluorescent member; and rotates the driving portion to make the first spectroscopic wheel and the first a light source and a time-division illumination driving of the second light source are synchronously rotated; an input portion for inputting an image signal; and a light image forming portion formed by using light reflected or reflected from the first beam splitter wheel a light image corresponding to the image signal input by the input unit; and a projection unit projecting the light image formed by the light image forming unit toward the projection object, wherein the computer functions as follows: the temperature detecting unit is configured to The light source and the second light source detect the temperature when the light is emitted according to the type; the measuring unit is configured to the first light source and the second light source The light intensity control unit measures the intensity of the light when the light is emitted, and the light emission control unit corrects the measurement result of the measurement unit using the detection result of the temperature detection unit, and controls the first light source based on the corrected measurement result and The luminous intensity of the second light source described above.