JP5930001B2 - Projection device - Google Patents

Description

The present invention relates to a projected shadow devices.

In order to perform color display with a projection display device, a planar light source that emits primary light of each of R, G, and B and a spatial light modulator corresponding to each are required, which increases the number of components. Therefore, the entire device cannot be reduced in size, weight, and cost. Therefore, a light-emitting diode that emits ultraviolet light is used as a light source, and visible light has a characteristic of transmitting ultraviolet light to the surface on the light source side of the color wheel irradiated with ultraviolet light from the light-emitting diode and reflecting visible light. Forming a reflective film,
A technique is considered in which a phosphor layer that emits visible light corresponding to R, G, and B is formed on the back side of the color wheel by ultraviolet light irradiation. (For example, Patent Document 1)

JP 2004-341105 A

However, when the techniques described in the above-mentioned patent documents are employed as they are, all the currently known red phosphors have significantly lower luminous efficiency than other green phosphors and blue phosphors. The red brightness is insufficient.

As a result, when it is attempted to obtain a bright projection image with priority given to luminance, there is a problem that white balance is lost and color reproducibility is degraded. On the other hand, if the white balance is emphasized and the color reproducibility is emphasized, the overall luminance of the entire image is reduced in accordance with the low-luminance red image, resulting in a dark image.

Such a defect still exists even when a configuration in which only red light emission is replaced with another light source, and the white balance may be lost due to aging deterioration that is different for each light source or phosphor, or the overall luminance may be reduced. Will not disappear.

The present invention has been made in view of the circumstances described above, and an object is to provide a projection shadow device capable of both long brightness of color reproducibility and the projected image.

The invention of claim 1 wherein is a projection device including a diffusion portion and the phosphor part, the diffusion unit diffuses the light of the first wavelength band, the fluorescent body part is rotated in an arc shape The phosphor portion has a central angle that is greater than one-third of the total circumferential angle of the rotating body and less than two-thirds, and has a wavelength band different from the first wavelength band. And the diffusing portion is located at a position corresponding to the remaining region of the phosphor portion.

  According to the present invention, it is possible to achieve both color reproducibility and brightness of a projected image for a long time.

1 is a block diagram showing a functional circuit configuration of an entire data projector apparatus according to a first embodiment of the present invention. The figure which shows the specific optical structure of the light source system mainly concerning the embodiment. The top view which shows the structure of the color wheel which concerns on the same embodiment. 6 is a flowchart showing the content of a light source luminance check process executed during a projection operation according to the embodiment. The figure which shows the drive timing of the light source system which concerns on the same embodiment. The figure which shows the drive timing of the light source system which concerns on the same embodiment. The figure which shows the drive timing of the light source system which concerns on the same embodiment. The block diagram which shows the functional circuit structure of the whole data projector apparatus which concerns on the 2nd Embodiment of this invention. 5 is a flowchart showing the content of a light source drive control process executed in parallel during the projection operation according to the embodiment.

(First embodiment)
In the following, a first case where the present invention is applied to a DLP (registered trademark) data projector apparatus will be described.
The embodiment will be described with reference to the drawings.

FIG. 1 is a block diagram illustrating a schematic functional configuration of an electronic circuit included in the data projector device 10 according to the present embodiment.
Reference numeral 11 denotes an input / output connector, for example, a pin jack (RCA) type video input terminal, a D-sub15 type RGB input terminal, and a USB (Universal Ser).
ial Bus) connector.

Image signals of various standards input from the input / output connector unit 11 are input / output interfaces (
I / F) 12 and the system bus SB are input to an image conversion unit 13 that is also generally called a scaler.

The image conversion unit 13 unifies the input image signal into an image signal of a predetermined format suitable for projection, writes the image signal to the video RAM 14 as a display buffer memory, and then reads the written image signal. The image is sent to the projection image processing unit 15.

At this time, data such as symbols indicating various operation states for OSD (On Screen Display) is also superimposed on the image signal by the video RAM 14 as necessary, and the processed image signal is read out to the projection image processing unit 15. Sent.

The projection image processing unit 15 multiplies a frame rate according to a predetermined format, for example, 120 [frames / second], the number of color component divisions, and the number of display gradations, in accordance with the transmitted image signal. The micromirror element 16, which is a spatial light modulation element (SLM), is driven to display by high-speed time division driving.

The micromirror element 16 includes a plurality of, for example, XGA (lateral 102) arranged in an array.
A light image is formed by the reflected light by individually turning on / off each tilt angle of the micromirror corresponding to 4 pixels × 768 pixels) at a high speed.

On the other hand, R, G, B primary color lights are emitted cyclically from the light source unit 17 in a time-sharing manner. The primary color light from the light source unit 17 is totally reflected by the mirror 18 and applied to the micromirror element 16.

Then, an optical image is formed by the reflected light from the micromirror element 16, and the formed optical image is projected and displayed on a screen (not shown) to be projected through the projection lens unit 19.

Although the specific optical configuration will be described later, the light source unit 17 includes two types of light sources, that is, a semiconductor laser 20 that emits blue laser light, and an LED 21 that emits red light.

The blue laser light emitted from the semiconductor laser 20 is totally reflected by the mirror 22, passes through the dichroic mirror 23, and is irradiated to one point on the circumference of the color wheel 24. The color wheel 24 is basically rotated at a constant speed by a motor 25. On the periphery of the color wheel 24 irradiated with the laser light, the green fluorescent reflection plate 24G and the blue diffusion plate 24B are formed in a ring shape.

When the green fluorescent reflector 24G of the color wheel 24 is in the laser light irradiation position, the green light is excited by the laser light irradiation, and the excited green light is reflected by the color wheel 24, and then the dichroic mirror 23 also. Reflected. Thereafter, the green light is further reflected by the dichroic mirror 28, converted into a luminous flux having a substantially uniform luminance distribution by the integrator 29, totally reflected by the mirror 30, and sent to the mirror 18.

Further, as shown in FIG. 1, when the blue diffuser plate 24B of the color wheel 24 is at the laser light irradiation position, the laser light passes through the color wheel 24 while being diffused by the diffuser plate 24B, and then mirrors 26, 27. Are totally reflected. Thereafter, the blue light is transmitted through the dichroic mirror 28, converted into a luminous flux having a substantially uniform luminance distribution by the integrator 29, totally reflected by the mirror 30, and sent to the mirror 18.

Further, the red light emitted from the LED 21 is reflected by the dichroic mirror 28 after passing through the dichroic mirror 23, and is totally reflected by the mirror 30 after being converted into a luminous flux having a substantially uniform luminance distribution by the integrator 29. 18 is sent.

As described above, the dichroic mirror 23 has a spectral characteristic of transmitting blue light and red light while reflecting green light.

The dichroic mirror 28 has a spectral characteristic of transmitting blue light while reflecting red light and green light.

In addition, an optical sensor LS is arranged toward the outgoing light side of the integrator 29. The optical sensor LS detects only the luminance regardless of the color of the light, and the detection output is output to the projection light processing unit 31.

However, the projection light processing unit 31 controls the light emission timing and light emission intensity of the semiconductor laser 20 and the LED 21 of the light source unit 17, the rotation of the color wheel 24 by the motor 25, and the detection by the optical sensor LS. The projection light processing unit 31 includes the projection image processing unit 1.
5 gives a timing signal of image data.

Under the overall control of the CPU 32 to be described later, the projection light processing unit 31 emits light emission timings and light emission intensities of the semiconductor laser 20 and the LED 21 constituting the light source unit 17, rotation of the color wheel 24 by the motor 25, and the light. Control of the projection light processing unit 31 that performs detection by the sensor LS is executed.

The CPU 32 controls all the operations of the above circuits. The CPU 32 uses a main memory 33 composed of DRAM and a program memory 34 composed of an electrically rewritable non-volatile memory storing operation programs, various fixed data, and the like in the data projector apparatus 10. Perform control actions.

The CPU 32 executes various projection operations in response to key operation signals from the operation unit 35.
The operation unit 35 includes a key operation unit provided on the main body of the data projector device 10 and a laser light receiving unit that receives infrared light between 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 a remote controller is directly output to the CPU 32.

The operation unit 35 includes, for example, a focus adjustment key, a zoom adjustment key, an input switching key, a menu key, a cursor (←, →, ↑, ↓) key, a set key, a cancel key, etc. together with the key operation unit and the remote controller. Prepare.

In the program memory 34, in addition to the operation program and various fixed data described above,
It is assumed that the drive current values of the LED 21 and the semiconductor laser 20 at the time of each light emission of R, G, B in a state where white balance at the time of factory shipment is taken are fixedly stored as rated current values.

The CPU 32 is further connected to the audio processing unit 36 via the system bus SB. The sound processing unit 36 includes a sound source circuit such as a PCM sound source, converts the sound data given during the projection operation into an analog signal, drives the speaker unit 37 to emit a loud sound, or generates a beep sound or the like as necessary.

Next, FIG. 2 mainly shows a specific optical system configuration example of the light source unit 17. The figure shows the configuration around the light source unit 17 in a planar layout.

Here, a plurality of, for example, three semiconductor lasers 20A to 20C having the same light emission characteristics are provided, and these semiconductor lasers 20A to 20C are all blue, for example, a wavelength of about 450 [nm].
The laser beam is oscillated.

The blue light oscillated by the semiconductor lasers 20A to 20C is totally reflected by the mirrors 22A to 22C through the lenses 41A to 41C, and further passes through the lenses 42 and 43 and then passes through the dichroic mirror 23 to pass through the lens group 44. The color wheel 24 is irradiated.

FIG. 3 shows a configuration of the color wheel 24 in the present embodiment. As shown in the figure, on the color wheel 24, for example, an arcuate blue diffuser plate 24B having a central angle of about 150 ° and an arcuate green phosphor reflecting plate 24G having a central angle of about 210 ° are combined. Form a ring.

In the present embodiment, the center angle of the blue diffusion plate 24B is 1 corresponding to 1/3 of the entire circumference of 360 °.
As an angle larger than 20 ° and smaller than 240 ° corresponding to 2/3, for example, about 15
Set to 0 °. Thereby, the green phosphor reflector 24G was set to be about 210 ° with the central angle remaining. By setting such an angle, it is possible to cope with the case where the time width of each field of R, G, and B constituting one image frame described later is varied.

In FIG. 3, the reference position of the color wheel 24 is 0 °, and the position where the blue light from the semiconductor lasers 20 </ b> A to 20 </ b> C is irradiated by the rotation of the color wheel 24 is the blue diffusion as indicated by the arrow MV in the figure. It represents moving on the circumference composed of the plate 24B and the green phosphor reflector 24G.

When the blue diffuser plate 24B of the color wheel 24 is at the irradiation position of the blue light from the semiconductor lasers 20A to 20C, the irradiated blue light is transmitted through the color wheel 24 while being diffused by the diffuser plate 24B, and on the back side. The light is totally reflected by the mirror 26 through a lens 50.

Further, the blue light is totally reflected by the mirror 27 through the lens 51, passes through the lens 52 and then passes through the dichroic mirror 28, and is converted into a light beam having a substantially uniform luminance distribution by the integrator 29 through the lens 46. The light is totally reflected by the mirror 30 via the lens 47 and sent to the mirror 18 via the lens 48.
The blue light totally reflected by the mirror 18 is irradiated to the micromirror element 16 through the lens 49. Then, a blue component light image is formed by the reflected light of the blue light, and is projected to the outside through the lens 49 and the projection lens unit 19.

On the other hand, when the green phosphor reflecting plate 24G is at the blue light irradiation position from the semiconductor lasers 20A to 20C, the green light in the wavelength band centered on the wavelength of about 530 [nm], for example, is excited by the irradiation. After the green light is reflected by the color wheel 24, it is also reflected by the dichroic mirror 23 via the lens group 44.

The green light reflected by the dichroic mirror 23 is further reflected by the dichroic mirror 28 via the lens 45, and is converted into a luminous flux having a substantially uniform luminance distribution by the integrator 29 via the lens 46, and then by the mirror 30 via the lens 47. The light is totally reflected and sent to the mirror 18 through the lens 48.
The green light totally reflected by the mirror 18 is irradiated to the micromirror element 16 through the lens 49. Then, a green component light image is formed by the reflected light of the green light, and is projected to the outside through the lens 49 and the projection lens unit 19.

The LED 21 generates red light having a wavelength of 620 [nm], for example. LED21
The red light emitted from the light passes through the lens group 53, passes through the dichroic mirror 23, is reflected by the dichroic mirror 28 through the lens 45, and further passes through the lens 46, and the luminous flux has a substantially uniform luminance distribution by the integrator 29. Then, the light is totally reflected by the mirror 30 via the lens 47 and sent to the mirror 18 via the lens 48.
The red light totally reflected by the mirror 18 is irradiated to the micromirror element 16 through the lens 49. Then, a red component light image is formed by the reflected light of the red light, and is projected to the outside through the lens 49 and the projection lens unit 19.

Next, the operation of the above embodiment will be described.
Here, a period (hereinafter referred to as “B field, R field, and G field”) for projecting each primary color image of B, R, and G constituting one frame of the color image to be projected is equally divided, and the time ratio is 1 : 1: 1.

That is, for one rotation 360 ° of the color wheel 24 rotating at a constant speed, the time ratio b: r: g of the B field, R field, and G field is 120 °: 120 when the center angle of the color wheel 24 is replaced. °: 120 °.

FIG. 4 is a flowchart showing the content of the brightness check process of the light source unit 17 executed when the data projector device 10 is turned on.
The brightness check process is automatically executed not only when the power is turned on, but also when the user of the data projector apparatus 10 manually selects the adjustment operation and when the projection operation is continued for a certain time, for example, 10 hours. It is good.

The processing in FIG. 4 is executed after the CPU 32 reads out the operation program stored in the program memory 34 and develops it on the main memory 33.

At the beginning of the processing, the CPU 32 assigns an initial value “1” to the variable n (step S101).
.

Then, according to the value of the variable n at that time, for example, “1”, the semiconductor lasers 20A to 20C emit light with the rated current in the B field, and the luminance Lbn (Lb1) on the output side of the integrator 29 is measured by the optical sensor LS. To record (step S102).

Here, the rated current passed through the semiconductor lasers 20A to 20C is read and set from the program memory 34, and is necessary for emitting the B light in the initial state where white balance is maintained at the time of shipment from the factory as described above. Current value.

Similarly, the LED 21 is caused to emit light at the rated current in the subsequent R field, and the luminance Lrn (Lr1) on the output side of the integrator 29 is measured by the optical sensor LS and recorded (step S103).

Here, the rated current flowing through the semiconductor lasers 20A to 20C is also set by reading from the program memory 34, and as described above, it is necessary for emitting R light in an initial state where white balance is maintained at the time of shipment from the factory. Current value.

Further, in the subsequent G field, the semiconductor lasers 20A to 20C are caused to emit light at the rated current, and the luminance Lgn (Lg1) on the output side of the integrator 29 is measured by the optical sensor LS and recorded (step S104).

Here, the rated current passed through the semiconductor lasers 20A to 20C is also set by reading from the program memory 34, and as described above, it is necessary to emit G light in an initial state where white balance is maintained at the time of shipment from the factory. Current value.

Subsequently, the variable n is updated and set to “+1” (step S105). After confirming that the value of the updated variable n is not "4" (step S106), the process returns to step S102 again.

Thus, the luminances Lb1, Lr1, Lg1, Lb2, Lr2, Lg2, Lb3, Lr3, and Lg3 in the B field, R field, and G field are sequentially measured over a total of three frames.

FIG. 5 is a diagram illustrating a driving state of the light source unit 17 when the luminance check process is executed.
FIG. 5A shows the color of the light source light emitted to the micromirror element 16. In this way, control is performed so that a light image of each color is formed in the same time in each period of the B field, the R field, and the G field equally divided in one color image frame.

FIG. 5B shows the drive current of the LED 21, and FIG. 5C shows the semiconductor laser (B-LD) 20A-
A drive current of 20 C is shown. In the B field at the beginning of the frame, the semiconductor laser 20A
The rated drive current IstB for blue image is given to ˜20C, and the luminance Lbn (Lb1 to Lb3) on the integrator 29 output side at that time is measured as described above.

Similarly, in the R field, the rated drive current IstR for red image is given to the LED 21, and the luminance Lrn (Lr1 to Lr3) on the output side of the integrator 29 at that time as described above.
Is measured.

Further, in the G field, the rated drive current IstG for green images is given to the semiconductor lasers 20A to 20C, and as described above, the luminance Lgn (
Lg1 to Lg3) are measured.

In FIG. 5C, the blue image rated drive current IstB and the green image rated drive current IstG applied to the semiconductor lasers 20A to 20C are shown in the same state. In a state where the white balance is achieved, the rated drive current IstG for the green image and the rated drive current Ist for the green image are preliminarily determined by the fluorescence characteristics of the green phosphor reflector 24G.
G may be different.

After the luminance value is measured over three frames as described above, if the variable n is further updated by “+1” to “4” in step S105, it is confirmed in the subsequent step S106, and the luminance measurement is temporarily stopped.

Next, each color luminance Lb, Lr, L when driven at the rated current from the measured values for three frames.
The average Lbav, Lrav, and Lgav of g are obtained (step S107).

B based on the rated drive currents IstB, IstR, and IstG so that an optimum white balance can be obtained based on the obtained average luminances Lbav, Lrav, and Lgav.
The drive currents IB1, IR1, and IG1 in the field, R field, and G field are calculated and set (step S108).

Specifically, with reference to the light source color that exhibits the most significant decrease in luminance with respect to the original white balance, adjustment is performed so that the other two light source colors have the optimum white balance.

FIG. 6 is a diagram showing a driving state of the light source unit 17 when a new driving current is set in this way.
FIG. 6A shows the color of the light source light emitted to the micromirror element 16.

6B shows the drive current of the LED 21, and FIG. 6C shows the semiconductor laser (B-LD) 20A to
A drive current of 20 C is shown. In the B field at the beginning of the frame, the semiconductor laser 20A
A drive current IB1 lower than the rated drive current IstB for blue images is given to ˜20C.

In the subsequent R field, the LED 21 is given a drive current IR1 higher than the rated drive current IstR for red images. In the subsequent G field, the semiconductor lasers 20A to 20A-20
A drive current IG1 higher than the rated drive current IstG for green images is given to C.

Here, assuming that the decrease in the light emission luminance of the LED 21 is the most significant, the drive current IR1 of the LED 21 is set to a value significantly higher than the rated drive current IstR, and an appropriate white balance is set for the new light emission luminance of the R light. The semiconductor lasers 20A to 20C
The driving current IG1 for the green image is set to be slightly higher than the rated driving current IstG, and the driving current IB1 for the blue image to the semiconductor lasers 20A to 20C is conversely lower than the rated driving current IstB. An example of setting is shown.

In this way, the brightness is measured based on driving at the rated drive current, and a new drive current is set so as to obtain an optimum white balance considering the deterioration of each color based on the measurement result. Finish preparations for projection.

In addition, here, the deterioration of the semiconductor lasers 20A to 20C and the LEDs 21 constituting the elements of the light source unit 17 is further determined based on the calculated average luminance value.
That is, the average luminance Lbav when the semiconductor lasers 20A to 20C are driven with a rated current for a blue image is the average luminance Lrav when the LED 21 is driven with a rated current for a red image.
It is determined whether or not any of the semiconductor lasers 20A to 20C has deteriorated below the practical limit depending on whether or not it is lower than the product obtained by multiplying by a predetermined coefficient K1 (step S109).

Here, the coefficient K1 is determined in advance according to the luminance characteristics of the blue light emitted from the semiconductor lasers 20A to 20C at the time of product shipment, the transmission characteristics of the blue diffusion plate 24B of the color wheel 24, and the luminance characteristics of the red light emitted from the LED 21. It is a coefficient recorded in the program memory 34.

The average luminance Lrav when the LED 21 is driven with the rated current for the red image is compared, and the average luminance Lgav when the semiconductor lasers 20A to 20C are driven with the rated current for the green image is rated for the blue image. The deterioration of the semiconductor lasers 20A to 20C is judged from the average luminance Lbav when the semiconductor lasers 20A to 20C are driven by current. The phosphor applied to the green phosphor reflector 24G of the color wheel 24 may be deteriorated. This is because it is difficult to practically consider that the blue diffusion plate 24B portion of the color wheel 24 that only transmits and diffuses laser light is deteriorated.

If it is determined in step S109 that the semiconductor lasers 20A to 20C have deteriorated by a predetermined value or more, the semiconductor lasers 20A to 20C, or the light source unit 17 provided by the assembly unit, replace the assembly unit itself. Such a guide message is output as a projected image (step S110).

Next, the average luminance Lbav when the semiconductor lasers 20A to 20C are driven with a rated current for a blue image is multiplied by the predetermined coefficient K2 to the average luminance Lgav when the semiconductor lasers 20A to 20C are driven with a rated current for a green image. It is determined whether the phosphor applied to the green phosphor reflector 24G portion of the color wheel 24 has deteriorated below the practical limit depending on whether it is higher than the product (step S111). .

The coefficient K2 is applied to the luminance characteristics of blue light emitted from the semiconductor lasers 20A to 20C at the time of product shipment, the transmission characteristics of the blue diffusion plate 24B of the color wheel 24, and the green phosphor reflection plate 24G. The coefficient is recorded in advance in the program memory 34 in accordance with the fluorescence characteristics of the phosphor.

If it is determined in step S111 that the green phosphor reflector 24G of the color wheel 24 has deteriorated by a predetermined value or more, the assembly unit if the color wheel 24 or the light source unit 17 provides the assembly unit. A guide message for exchanging itself is output as a projection image (step S112).
After completing the luminance check process in FIG. 4 in this way, the process shifts to a normal projection operation.

As described above in detail, according to the present embodiment, when a plurality of light source elements and phosphors constituting the light source unit 17 are used, even when individual elements or the like have deteriorated over time, the color is compensated for. It becomes possible to achieve both reproducibility and brightness of the projected image for a long time.

In the above embodiment, the optical sensor LS is disposed on the output side of the integrator 29, and
Each light emission luminance of blue light, red light, and green light is detected by one optical sensor LS.

As a result, it is possible to detect the light emission luminance of all the necessary color lights while simplifying the configuration of the necessary circuit elements as much as possible, and the increase in the manufacturing cost of the entire apparatus can be minimized.

In the above embodiment, R, G constituting one frame is based on the result of the luminance check.
1 and B, the light emission intensity of the light emitting element on the light source side is variably adjusted without changing the time width of each field period.
As a result, it is not necessary to vary the operation timing in the circuit on the side that forms the optical image including the projection image processing unit 15 and the micromirror element 16, and control is facilitated.

In the process of FIG. 4 described above, one of the semiconductor lasers 20A to 20C is determined depending on whether or not the value of the emission luminance of the semiconductor lasers 20A to 20C is equal to or less than a predetermined ratio as compared with the emission luminance of the LED 21 in step S109. In the case where the LED 21 has deteriorated together with the semiconductor lasers 20A to 20C, the deterioration is determined in the determination process shown in step S109. It cannot be detected.

Therefore, the luminance may be measured for each of the LED 21 and the semiconductor lasers 20A to 20C and the absolute value thereof may be compared with the original luminance. By adding such processing, the LE
It is possible to accurately determine the luminance deterioration of each of D21 and the semiconductor lasers 20A to 20C. And
As described above, when any one of the semiconductor laser, the LED 21, and the phosphor applied to the green phosphor reflector 24G has deteriorated by a predetermined value or more, a replacement instruction or the like can be notified.

As shown in FIG. 6, the light emission intensity is not variably adjusted by controlling the drive current of the light emitting element on the light source side, but one frame is formed while the light emission power of each light emitting element is constant. This may be dealt with by changing the time width of each of the R, G, and B field periods.

FIG. 7 shows an example of driving the light source unit 17 when the time width of each field period of R, G, B constituting one frame is changed in place of the processing in step S108.

Here, even after the luminance check process, the semiconductor laser 20A is similar to the state described with reference to FIG.
Although the driving at the rated currents IstB, IstR, and IstG is continued for each of ˜20C and the LED 21, the time width of each field is greatly changed.

That is, the B field has a time width corresponding to 78 °, which is greatly reduced from the time width corresponding to 120 ° at the central angle of the rotating color wheel 24. The subsequent R field has a time width corresponding to 150 °, greatly increasing from the time corresponding to 120 ° at the central angle of the rotating color wheel 24. The G field thereafter has a time width corresponding to 132 °, slightly increasing from the time corresponding to 120 ° at the central angle of the rotating color wheel 24.

The CPU 32 uses the projection light processing unit 31 to perform the semiconductor lasers 20A to 20C and the LED 2.
It is necessary to synchronize the timing of forming a light image in the projection system including the projection image processing unit 15 and the micromirror element 16 with the adjustment content of the light source light at the same time as controlling the driving current and the driving timing of 1 as described above. There is.

In this way, the light emission intensity is not adjusted by the power for driving the light source elements, but the time width is adjusted for each field constituting one frame while driving each light emitting element at a constant power, thereby obtaining an image. While the time control on the projection side is complicated, each light emitting element is always driven with a constant power, so there is no risk of accelerating the deterioration of the light emitting element, and the life of the light emitting element is extended. Can do.

In the above embodiment, by providing the optical sensor LS on the output side of the integrator 29,
Although it has been described that it is possible to detect the emission intensity of each color of B, R, and G, the semiconductor lasers 20A to 20C, which are light emitting elements, or the LED 2 due to the design of the apparatus and the characteristics of the light emitting elements.
If any one of 1 is significantly reduced in light emission intensity or is likely to be deteriorated as compared with the other, the photosensor LS is disposed so as to directly face the light emitting portion of the light emitting element. May be.

In the above-described embodiment, any one of the semiconductor lasers 20A to 20C or the LED 21 is selectively driven, and B (blue) light, R (red) light, and G (green light) B field, R field, and Although it has been described that one color image frame is composed of the G field, the present invention is not limited to this, and a plurality of light emitting elements may emit light at the same time to include an image field based on the mixed color.

Specifically, for example, it is assumed that an image field that projects a light image of M (magenta) color by mixing B (blue) light and R (red) light B simultaneously is present in one image frame. Alternatively, an image field for projecting a Y (yellow) light image by color mixture by simultaneously emitting G (green) light and R (red) light B may be present in one image frame. .

By providing such an image field by color mixture, it is possible to further increase the color expression and the brightness of the image, and as a result, it is possible to perform projection according to the environment in which the data projector device 10 is used.

(Second Embodiment)
A second case where the present invention is applied to a DLP (registered trademark) type data projector apparatus will be described below.
The embodiment will be described with reference to the drawings.

FIG. 8 is a block diagram showing a schematic functional configuration of an electronic circuit provided in the data projector device 10 ′ according to the present embodiment.
The basic electronic circuit constituting the data projector device 10 ', and particularly the light source unit 1
7 is almost the same as the contents shown in FIGS. 1 and 2, and the same parts are denoted by the same reference numerals and the description thereof is omitted.

The light source unit 17 is different from the first embodiment in that it does not have the optical sensor LS shown in FIGS.

In addition, a CPU 32 ′ replacing the CPU 32 includes a timer 32a that counts the light emission time.

Furthermore, a program memory 34 ′ that replaces the program memory 34 includes a light emission time log storage unit 34a and a drive current conversion table 34b. The light emission time log storage unit 34 a holds the accumulated light emission times of the semiconductor lasers 20 </ b> A to 20 </ b> C of the light source unit 17 and the LED 21. The drive current conversion table 34b stores in advance a reference drive current value corresponding to the accumulated light emission time of each of the semiconductor lasers 20A to 20C and the LED 21 in the form of a lookup table. The stored contents of the drive current conversion table 34b are obtained by storing a reference drive current value for obtaining a required light emission luminance as a predicted value from the temporal change characteristics of the semiconductor lasers 20A to 20C and the LED 21.

Next, the operation of the above embodiment will be described.
In the present embodiment, the data projector device 10 ′ can select one of a plurality of color projection modes from, for example, a normal mode, a presentation mode, a theater mode, a graphics mode, and a blackboard mode. And
The normal mode is used as a reference for the color projection mode of the data projector apparatus 10 ', and is set with an emphasis on color expression.
The presentation mode is suitable for general presentations in bright places.
Use a setting that emphasizes brightness.
The theater mode is set with emphasis on the expression of the dark part of the movie.
The graphics mode is set so as to emphasize gradation expression so that a photograph or the like looks natural.
The blackboard mode is set so that the projection content can be clearly discriminated even when an image is projected onto the blackboard.

For each of the color modes other than the normal mode, a projection time conversion coefficient based on the difference between the drive current values of the semiconductor lasers 20A to 20C and the LED 21 with respect to the normal mode is stored in the program memory 34 'in advance. To do.

FIG. 4 shows the processing content of the drive control of the light source unit 17 executed in parallel with the projection operation after the data projector device 10 'is turned on. The processing shown in FIG. 9 is executed after the CPU 32 ′ reads out the operation program stored in the program memory 34 ′ and develops it on the main memory 33.

At the beginning of the processing, the CPU 32 ′ reads the drive time log storage unit 34 a and reads the semiconductor laser 2.
The accumulated light emission times of 0A to 20C and the LED 21 are read (step S301).

Then, referring to the drive current conversion table 34b according to the read accumulated light emission time, the respective reference drive currents of the semiconductor lasers 20A to 20C and the LED 21 are read (step S30).
2).

Each read reference drive current value is set in the projection light processing unit 31 (step S).
303). In addition, information on the color projection mode that was set when the power was last turned off is read from the program memory 34 '(step S304).

Based on the read information on the color projection mode, the respective drive currents when B (blue) light and G (green) light are emitted by the semiconductor lasers 20A to 20C and the R (red) light emitted by the LED 21 are emitted. The projection light processing unit 31 sets the product of the additional drive current ratio and the set reference drive current as a new drive current (step S305).

Further, the timer 32a in the CPU 32 'is reset to start counting the projection time (step S306).

Thereafter, while the projection operation in the set color projection mode is executed in parallel, whether or not the power-off key operation is performed by the operation unit 35 (step S307), and the operation of changing the color projection mode is performed. Whether or not these operations have been performed is repeatedly determined (step S308) to wait for these operations to be performed.

If an operation to change the color projection mode is performed during the projection operation, step S3 is performed.
In 08, it is judged, and the measured value of the timer 32a at that time is read (step S309).
).

Next, the light emission times of the semiconductor lasers 20A to 20C and the LEDs 21 converted in the normal mode are calculated based on the read timekeeping value and the color projection mode that has been set so far, and the light emission time log is stored using the calculated light emission times. The contents of the unit 34a are updated and set (step S310).

Next, as described above, after switching to a new color projection mode is executed (step S311), the process returns to step S306 again.

If it is determined in step S307 that an operation for instructing power-off is performed, the time value of the timer 32a at that time is read (step S312).

Next, the light emission times of the semiconductor lasers 20A to 20C and the LEDs 21 converted in the normal mode are calculated based on the read timekeeping value and the color projection mode that has been set so far, and the light emission time log is stored using the calculated light emission times. The contents of the unit 34a are updated and set (step S313).

Next, as described above, the process for turning off the power of the data projector apparatus 10 'including the after cooling process is executed (step S314), and the process of FIG.

As described in detail above, according to the present embodiment, in particular, the direct semiconductor lasers 20A to 20C and the LED
If the degree of aged deterioration of the light emitting element can be predicted without providing a circuit element such as a sensor for detecting the light emission luminance of 21, the individual elements etc. will deteriorate over time when a plurality of light sources and phosphors are used. If this occurs, it is possible to compensate for this, and to achieve both color reproducibility and the brightness of the projected image for a long time.

In addition, in the above-described embodiment, one of a plurality of color projection modes can be selected, and the light emission time of the light emitting element in each color projection mode is converted into one reference color projection mode, and then is set for each light emitting element. The emission time was integrated and managed.

This makes it easy to manage the accumulated light emission time, and is different for each color projection mode.
An accurate management method can be established in consideration of the degree of wear of a plurality of light emitting elements.

In both the first and second embodiments, the semiconductor lasers 20A to 20C oscillate blue laser light and the color wheel 24 generates blue light and green light.
Although the ED21 has been described as generating red light, the present invention is not limited to this, and when the luminance balance of primary color light that can be generated by one light source is not suitable for practical use, it is compensated by using another light source. Such a light source unit using a plurality of types of light sources and a projection apparatus using such a light source unit can be similarly applied.

In each of the embodiments described above, the present invention is applied to a DLP (registered trademark) type data projector apparatus. For example, a liquid crystal projector that forms a light image using a transmissive monochrome liquid crystal panel. The present invention can be similarly applied to the above.

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.

DESCRIPTION OF SYMBOLS 10,10 '... Data projector apparatus, 11 ... Input / output connector part, 12 ... Input / output interface (I / F), 13 ... Image conversion part (scaler), 14 ... Video RAM, 15 ... Projection image processing part, 16 ... Micromirror element (SLM), 17 ... light source, 18 ... mirror, 1
9 ... Projection lens unit, 20 ... (B emission) semiconductor laser, 21 ... (R emission) LED, 2
2 ... Mirror, 23 ... Dichroic mirror, 24 ... Color wheel, 24B ... Blue diffuser, 24G ... Green phosphor reflector, 25 ... Motor (M), 26, 27 ... Mirror, 28 ... Dichroic mirror, 29 ... Integrator 30 ... Mirror, 31 ... Projection light processing unit, 32,
32 '... CPU, 32 ... timer, 33 ... main memory, 34, 34' ... program memory, 34a ... light emission time log storage unit, 34b ... drive current conversion table (TB), 35 ... operation unit, 36 ... audio processing unit 37 ... Speaker part, 41A-41C, 42, 43 ... Lens, 44
... lens group, 45-52 ... lens, 53 ... lens group, SB ... system bus, LS ... optical sensor.

Claims (3)

A projection device comprising a phosphor part and a diffusion part,
The diffusion unit diffuses light in the first wavelength band,
The phosphor part is provided in a rotating body in an arc shape,
The phosphor portion is a fluorescent light that excites light in a wavelength band different from the first wavelength band, with a central angle being an angle larger than one-third and smaller than two-thirds of the entire circumferential angle of the rotating body. Have a body ,
The diffusion portion is at a position corresponding to the remaining region of the fluorescent body part,
A projection apparatus characterized by that. The angle of the central angle of the phosphor part is larger than the angle of the central angle of the diffusion part,
The projection apparatus according to claim 1. A first light source that irradiates the rotating body with light of the first wavelength band;
A projection control means for controlling a projection state by adjusting a time width that the first light source irradiates the rotating body;
Projection apparatus according to claim 1 or claim 2, further comprising a.

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