JP2002010177A - Projection display device and illumination unit thereof - Google Patents

Abstract

(57) Abstract: A color balance of a projected image is corrected in accordance with a light emission spectrum distribution characteristic of an illumination lamp. A control circuit measures a cumulative lighting time every time an illumination lamp is turned on, and stores the accumulated lighting time in a memory in a lamp unit. The control circuit 9 includes an illumination lamp 13
Is read from the memory 23. The control circuit 9 reads out the color separation / combination characteristic data of the optical system 6 from the memory in the control circuit 9. The control circuit 9 multiplies the read emission spectrum distribution characteristic and the color separation / synthesis characteristic of the optical system 6 every 10 nm, and converts the light amount of each color component emitted from the projection lens 7 of the optical system 6 (FIG. 2) to a wavelength of 10 nm. It is calculated every time. Control circuit 9
Sets the amplification factors for the R, G, and B signals in the correction circuit 4 so that the calculated light amount ratios of the R, G, and B components are set to a predetermined ratio. As a result, the projection lens 7
The color balance of the image projected from is appropriately corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a projection display device for projecting an image based on an image signal such as a video signal, and a lighting unit used for the projection display device.

[0002]

2. Description of the Related Art There is a projector that inputs an image signal such as a video signal from an external device and projects an image based on the input image signal. And Japanese Patent Application Laid-Open No. 7-31372
As disclosed in Japanese Unexamined Patent Publication, a projector capable of replacing an illumination lamp has been proposed.

[0003]

Attention is paid to two light emission characteristics as characteristics of an illumination lamp. One is a characteristic of a color to be emitted, and the other is a characteristic of brightness. There are a plurality of types of illumination lamps, such as a xenon lamp and a halogen lamp. Naturally, different types of illumination lamps have different emission characteristics. Further, even if the illumination lamps are of the same type, the emission characteristics of a new illumination lamp are different from those of an illumination lamp that has been turned on for a long time. However, conventional projectors do not sufficiently support various light emission characteristics of illumination lamps. Therefore, there is a possibility that an image having a poor color balance or a dark image is projected.

An object of the present invention is to provide a projection display device which projects an appropriate image in accordance with the light emission characteristics of a lighting unit, and to provide the lighting unit.

[0005]

The present invention will be described with reference to FIGS. 1, 2 and 7 showing one embodiment. (1) The projection type display device according to the first aspect of the present invention,
An illumination unit 12 for emitting illumination light, and an illumination unit 1
And an image generation element P1 for generating an image by modulating and emitting illumination light from the illumination unit 12 based on an image signal.
P3, a projection optical system 7 for projecting the images of the image generating elements P1 to P3, determining means 9 for determining the light emission characteristics of the illumination unit 12, and image signal processing for correcting the image signal based on the determination of the determining means 9. With the means 4, the above-described object is achieved. (2) According to a second aspect of the present invention, in the projection display device according to the first aspect, a storage unit 23 for storing light emission characteristic data of the illumination unit 12 is further provided, and the determination unit 9 is provided.
Is characterized in that the light emission characteristics of the lighting unit 12 are determined based on the light emission characteristic data. (3) The invention according to claim 3 is the projection type display device according to claim 2, wherein the storage means 23 stores the illumination unit 12
And receiving means 15 for receiving the light emission characteristic data from the lighting unit 12 and outputting it to the judging means 9. (4) The invention according to claim 4 is the projection type display device according to claim 2, wherein the judgment means 9 and the image signal processing means 4 are provided.
And a lighting unit 12a (12 ′).
a) and type indicating means 14 (14 ') indicating the type of the lighting unit 12a (12'a); and the lighting unit 12a (14') disposed on the housing 1a and based on the type indicating means 14 (14 '). Illumination type detecting means 2 for detecting the type of 12'a)
5, the storage unit 23a is housed in the housing 1a, and the determination unit 9 stores the light emission characteristic data corresponding to the type of the illumination unit 12a (12′a) detected by the illumination type detection unit 25. It is characterized in that the light emission characteristics of the illumination unit 12a (12′a) are determined by reading from the means 23a. (5) The invention according to claim 5 is the projection type display device according to claim 4, further comprising lighting time detecting means 9 for detecting the cumulative lighting time of the lighting unit 12a (12'a). The means 9 stores the corresponding light emission characteristic data from the storage means 23a based on the type of the lighting unit 12a (12'a) detected by the lighting type detecting means 25 and the cumulative lighting time detected by the lighting time detecting means 9. By reading out, the light emission characteristics of the illumination unit 12a (12′a) are determined. (6) According to a sixth aspect of the invention, in the projection type display device according to the first aspect, the light emission characteristics are characteristics relating to the type of the illumination unit 12. (7) According to a seventh aspect of the present invention, in the projection type display device according to the first aspect, the light emission characteristics are characteristics relating to the cumulative lighting time of the illumination unit 12. (8) In the projection type display device according to the eighth aspect, in the projection type display device according to the seventh aspect, the storage means 23 for storing characteristic data relating to the cumulative lighting time, and the characteristic relating to the cumulative lighting time according to the cumulative lighting time. Data updating means 9 for updating data. (9) According to a ninth aspect of the present invention, in the projection display device according to the first aspect, the image signal processing means 4 performs color balance processing on the image signal based on the judgment of the judging means 9. It is characterized by. (10) According to a tenth aspect of the present invention, in the projection display device according to the first aspect, the image signal processing means 4 adjusts the luminance level of the image signal based on the judgment of the judging means 9. It is characterized by the following. (11) The invention described in claim 11 is applied to a lighting unit that is detachable from a projection display device. And it is characterized by having storage means 23 for storing the light emission characteristic data of the lighting unit 12. (12) The invention according to claim 12 is the lighting unit according to claim 11, wherein the light emission characteristic is the lighting unit 12
It is a characteristic relating to the type of (13) The invention according to claim 13 is the lighting unit according to claim 11, wherein the light emission characteristic is the lighting unit 12
Is a characteristic relating to the cumulative lighting time.

In the section of the means for solving the above-mentioned problems, for the sake of simplicity, the description is made in correspondence with the drawings of the embodiments, but the present invention is not limited to the embodiments.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS -First Embodiment- An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram illustrating an outline of a projection display device according to a first embodiment of the present invention. The projection display device generates an image based on an input video signal or the like, and projects the generated image toward a screen or the like. In FIG. 1, a projection display device 1 includes an A / D converter 3, a correction circuit 4, a drive circuit 5, an optical system 6, and a projection lens 7.
, A control circuit 9, a timing circuit 10, a lighting circuit 11,
Switches 16 and 18, power supply circuit 19, fan 2
4, a detection circuit 25, an LED 26, and a main switch 27. The projection type display device 1 is provided with a slot 22. The lamp unit 12 is mounted in the slot 22. The lamp unit 12 has an illumination lamp 13 and a memory 23. By mounting the lamp unit 12 in the slot 22, the lamp unit 12 is connected to the projection display device 1 via the connectors 14 and 15. That is, the illumination lamp 13 is connected via the connector 14.
And the lighting circuit 11 and the detection circuit 25 are connected.
Further, the memory 23 and the control circuit 9 are connected via the connector 15.

In FIG. 1, for example, an external device 8 such as a video device is connected to the projection display device 1 via a cable 20 and a connector 2. A video signal generated by the external device 8 is input from the connector 2 to the projection display 1. The A / D converter 3 converts the input video signal into a digital signal and sends the digital signal to the correction circuit 4. Correction circuit 4
Performs a color balance correction process described later on the input digital signal. The drive circuit 5 generates a drive signal for driving the optical system 6 from the digital signal after the correction processing.

The projection type display device 1 has a power cable 21
And an AC commercial power supply via the connector 17. The switch 18 turns on / off the supply of AC power to the power supply circuit 19. The power supply circuit 19 converts an AC voltage into a DC voltage used in each block in the projection display device 1 and supplies the DC voltage to each block. The switch 16 is a switch for turning on / off the illumination lamp 13, and turns on / off the supply of DC power to the lighting circuit 11.
The lighting circuit 11 converts the supplied voltage into a predetermined voltage required for lighting the illumination lamp 13 and lights the illumination lamp 13. The detection circuit 25 detects the terminal voltage of the illumination lamp 13 and sends it to the control circuit 9. Fan 24 is in slot 2
The illumination lamp 13 in the lamp unit 12 mounted on the cooling unit 2 is cooled. The fan 24 is provided so as to be in contact with the inner surface of the slot 22. The timing circuit 10 counts the elapsed time from a lighting instruction for the illumination lamp 13.

The control circuit 9 controls the operation of the A / D converter 3, the correction circuit 4, and the drive circuit 5, and performs the following operation. An operation signal from the main switch 27 of the projection display device 1 operated by the operator is input, and the switch 18 is turned on / off according to the operation signal. The switch 16 is turned on / off to turn on / off the illumination lamp 13.
Turn off the light. The detection circuit 25 detects the terminal voltage of the illumination lamp 13. The timing circuit 10 is caused to time. The rotation of the fan 24 is turned on / off. Data is written to and read from the memory 23. The LED 26 is turned on / off.

When AC commercial power is supplied to the projection display device 1 via the power cable 21, a DC power voltage is supplied to the control circuit 9 before other blocks. Thereafter, when an ON operation signal of the main switch 27 is input to the control circuit 9, the control circuit 9 turns on the switch 18, so that a DC power supply voltage is supplied to each block of the projection display 1. Further, the control circuit 9 controls the illumination lamp 13
The timing for turning on / off the switch 16 for turning on is determined by the presence or absence of the input of the video signal generated by the external device 8. That is, when the digital value converted by the A / D converter 3 is larger than the predetermined value, the control circuit 9 determines that a video signal is being input and instructs the switch 16 to be turned on. Further, the control circuit 9 controls the A / D converter 3
When the digital value converted in step (1) is equal to or less than the predetermined value, it is determined that the video signal is not input, and an instruction to turn off the switch 16 is issued. The turning on / off of the switch 16 may be performed based on the presence or absence of the input of the synchronization signal instead of the presence or absence of the input of the video signal.

The optical system 6 will be described. The above-described drive circuit 5 generates a drive signal for driving a liquid crystal panel described later in the optical system 6 according to the digital signal input from the correction circuit 4. The optical system 6 performs color synthesis of modulated light generated by the driven liquid crystal panel to generate an image. The projection lens 7 projects the generated image toward the screen S. The above-described illumination lamp 13 includes the optical system 6.
Illuminate the LCD panel inside.

The optical system 6 will be described in more detail with reference to FIG. The optical system 6 includes dichroic mirrors D1 to D4
, Liquid crystal panels P1 to P3, and mirrors M1 to M3. The dichroic mirrors D1 and D2 decompose the illumination light from the projection illumination lamp 13 (FIG. 1) into red, green, and blue (RGB), respectively.
Illuminate P3. Dichroic mirrors D1 and D2 are
It is also called an RGB color separation optical system. Liquid crystal panels P1 to P
3 spatially modulates the illumination light to generate images for each of the RGB colors. The mirrors M1 to M3 reflect light incident on the mirrors.

In FIG. 2, light emitted from an illumination lamp 13 which is turned on by a command from the control circuit 9 (FIG. 1) is reflected by a mirror M1. The light reflected by the mirror M1 is
The light is incident on a dichroic mirror D1 that reflects red light. The dichroic mirror D1 reflects only red light and transmits the remaining light. The red light reflected by the dichroic mirror D1 is reflected again by the mirror M2, and the liquid crystal panel P1 for red and the dichroic mirror D3 for color synthesis
And D4 are transmitted to the projection lens 7.

The light transmitted through the dichroic mirror D1 is incident on a dichroic mirror D2 that reflects blue light. The dichroic mirror D2 reflects only blue light and transmits the remaining light. Dichroic mirror D2
Is reflected by the dichroic mirror D3 for color synthesis, passes through the dichroic mirror D4, passes through the dichroic mirror D4, and transmits through the projection lens 7.
Emitted to The green light transmitted through the dichroic mirror D2 is transmitted through the green liquid crystal panel P2,
The light is reflected by the dichroic mirror 3 and the color synthesizing dichroic mirror D 4 and is emitted to the projection lens 7. The combined light of the red, blue and green spatially modulated lights emitted to the projection lens 7 is projected on the screen S by the projection lens 7. The dichroic mirrors D3 and D4 are also called a color combining optical system.

The memory 23 shown in FIG. 1 will be described. The memory 23 stores the time-dependent characteristics of the information indicating the emission spectrum of the illumination lamp 13, the terminal voltage of the illumination lamp 13 when the illumination lamp 13 is lit, the rate of increase in the terminal voltage at the start of lighting, and the illumination lamp 13. The terminal voltage of the illumination lamp 13 at the last lighting and the accumulated lighting time of the illumination lamp 13 are stored as data. Memory 2
Reference numeral 3 uses a non-volatile memory such as an EEPROM or a flash memory, and retains the contents stored in the memory 23 even when power is not supplied to the projection display apparatus 1. Further, even when the lamp unit 12 is not mounted in the slot 22, the content stored in the memory 23 is retained.

FIGS. 3A to 3D are diagrams for explaining the emission spectrum of the illumination lamp 13. FIG. In general, the emission spectrum of the high-pressure discharge lamp used for the illumination lamp 13 changes depending on the cumulative lighting time. FIG. 3A shows an emission spectrum when the cumulative lighting time of the illumination lamp 13 is t0A, and FIG. 3B shows the cumulative lighting time of the illumination lamp 13 at t0A.
FIG. 3C shows an emission spectrum at 1A (where t1A> t0A). FIG. 3C shows the cumulative lighting time of the illumination lamp 13 at t2A.
FIG. 4 is a diagram showing an emission spectrum at (where t2A> t1A). 3A to 3C, the horizontal axis represents the wavelength of light emitted from the illumination lamp 13. The vertical axis is
Indicates the energy of emitted light. In the example shown in FIGS. 3A to 3C, as the cumulative lighting time of the illumination lamp 13 increases, the energy of the wavelength component corresponding to the R color decreases as compared with the wavelength components corresponding to other colors. I do. In this embodiment, it is assumed that t0A = 0 (time).

When the emission spectrum of the illumination lamp 13 changes, the color balance of the image projected from the projection lens 7 changes. Therefore, the above-described correction circuit 4 performs a color correction process so as not to change the color balance of the projected image. The color correction processing is performed as follows. The control circuit 9 is shown in FIG.
For each of the emission spectrum distribution characteristics shown in FIGS. 3A to 3C, for example, an energy value for each wavelength of 10 nm is stored in the memory 23. The memory 23 also stores the cumulative lighting time of the illumination lamp 13 measured by the timing circuit 10.

On the other hand, a memory (not shown) in the control circuit 9 stores the color separation characteristics of the above-described optical system 6 by the color separation optical systems (D1, D2) and the color synthesis by the color synthesis optical systems (D3, D4). Characteristics are stored. The color separation characteristics are spectral characteristics generated due to the transmittance and reflectance of the dichroic mirrors D1 and D2 and the reflectance of the mirrors M1 and M2. The color synthesis characteristics are spectral characteristics generated due to the transmittance and the reflectance of the dichroic mirrors D3 and D4 and the reflectance of the mirror M3. These characteristics indicate which wavelength component of the illumination light incident on the optical system 6 is strongly emitted to the projection lens 7. The color separation characteristics and the color synthesis characteristics show optical characteristics assuming that the transmission spectral characteristics of the liquid crystal panels P1 to P3 do not have wavelength dependency, and are characteristics unique to the optical system 6. Fig. 3 (d)
FIG. 5 is a diagram illustrating an example of a color separation characteristic and a color synthesis characteristic.
The horizontal axis of FIG. 3D represents the wavelength of light after color separation and synthesis. The vertical axis in FIG. 3D represents the energy of light after color separation and synthesis. The color separation / synthesis characteristics are stored, for example, in a memory in the control circuit 9 for every 10 nm wavelength, similarly to the emission spectrum distribution characteristics stored in the memory 23. The control circuit 9 reads out the data of the cumulative lighting time of the illumination lamp 13 from the memory 23, and reads out the data of the emission spectrum distribution characteristic corresponding to the read cumulative lighting time from the memory 23. The control circuit 9 further reads data of the color separation / synthesis characteristics of the optical system 6 from a memory in the control circuit 9. By multiplying both of the read characteristic data by the corresponding wavelengths, the light amounts of the respective color components emitted to the liquid crystal panels P1 to P3 in the optical system 6 and emitted from the projection lens 7 for each wavelength of 10 nm are obtained. calculate. The optical system 6 stored in the memory in the control circuit 9
The color separation / synthesis characteristic data is held even when the power of the projection display device 1 is turned off.

R color, G color emitted from the projection lens 7,
The light amount of each component of B color will be described in detail. 3 (a) to 3
In (c), when the B color component is N every 10 nm from b1 to bN,
It is assumed to be represented by data. Similarly, the G color component
N data for every 10 nm from g1 to gN, R color component
It is assumed that the data is represented by N data of 10 nm from r1 to rN. The cumulative lighting time of the illumination lamp 13 is t2
Taking the case of A as an example, the light amounts of the R, G, and B components emitted from the projection lens 7 are expressed by the following equations (1) to (3).

(Equation 1) Here, L (R) is the light amount of R color emitted from the projection lens 7, L (G) is the light amount of G color emitted from the projection lens 7, and L (B) is emitted from the projection lens 7. The amount of light of B color. Further, (c) and (d) in the formulas are respectively shown in FIG.
3C shows the data of the emission spectrum distribution characteristic and FIG. 3D shows the data of the color separation / combination characteristic.

The light amounts of the R, G, and B components emitted from the projection lens 7 calculated as described above are assumed to have a ratio of, for example, 0.8: 1: 1.5. I do. In this case, the control circuit 9 sets the amplification factor for each color signal so that the calculated ratio is corrected to a predetermined ratio. For example,
Assuming that the predetermined ratio is X: Y: Z, the amplification factors set in the correction circuit 4 by the control circuit 9 are X / 0.8, Y, and Z, respectively.
/1.5. The correction circuit 4 amplifies each color digital signal based on the amplification factor set by the control circuit 9. As a result, the color balance of the image generated by the optical system 6 and projected from the projection lens 7 is corrected. Note that the calculated ratio of the light amount of each color indicates the color balance of the projected image. When the calculated light amounts of the respective colors are linearly combined, a brightness Y described later can be obtained.

The illumination lamp 13 has such a characteristic that, for example, the terminal voltage 10 minutes after the lighting instruction is given rises as the cumulative lighting time increases. Furthermore, the illumination lamp 13 has such a characteristic that the rate of increase in the terminal voltage in the initial stage of lighting, for example, for 5 minutes, increases as the cumulative lighting time increases. The control circuit 9 compares the rate of increase of the terminal voltage and the terminal voltage with a reference value stored in the memory 23 to determine the life of the illumination lamp 13. in this case,
Each time the lighting circuit 13 is turned on, the control circuit 9 sets the lighting lamp 13 after 10 minutes from the lighting instruction from the memory 23.
And the data of the terminal voltage increase rate for 5 minutes after the start of lighting. The control circuit 9 further issues a command to the detection circuit 25 to detect the terminal voltage of the illumination lamp 13 per unit time, and calculates the rate of increase in the terminal voltage for 5 minutes after the start of lighting from the obtained voltage value. Then, after lighting instruction 1
The terminal voltage after 0 minutes has elapsed is detected. The control circuit 9 compares the terminal voltage data 10 minutes after the lighting instruction read out from the memory 23 and the terminal voltage rise rate data 5 minutes after the start of lighting with the measured values, and compares the measured values with the measured values.
Then, it is determined whether or not the life of No. 3 is near.

Further, after the lighting lamp 13 is turned on,
For example, it has a characteristic that the terminal voltage detected after elapse of 10 minutes is increased with respect to the terminal voltage detected in the previous use. This increase rate increases as the cumulative lighting time increases. The control circuit 9 compares the terminal voltage with the previous terminal voltage stored in the memory 23 and compares the terminal voltage with the illumination lamp 13.
Judge the life of the battery. The control circuit 9 reads from the memory 23 the data of the terminal voltage measured when the illumination lamp 13 was last turned on every time the illumination lamp 13 is turned on. The control circuit 9 further issues a command to the detection circuit 25 to detect the terminal voltage of the illumination lamp 13 10 minutes after the start of lighting. The control circuit 9 compares the terminal voltage data read from the memory 23 with the measured terminal voltage to determine whether or not the life of the illumination lamp 13 is near.

The color balance correction operation of the projection display device 1 will be described with reference to a flowchart showing the processing performed by the control circuit 9. FIG. 4 shows an illumination lamp 1
9 is a flowchart illustrating an outline of color balance correction performed based on the cumulative lighting time of No. 3; Step S10
At 0, when the main switch 27 is turned on, the control circuit 9 outputs a signal for turning on the switch 18 and activates the program shown in the flowchart of FIG. Then, the flag F corresponding to the cumulative lighting time T is set to the initial value of 3. As for the flag F, F = 0 corresponds to the cumulative lighting time T = t0A, F = 1 corresponds to the cumulative lighting time T = t1A, and F = 3 corresponds to the cumulative lighting time T = t2A. In step S101, the control circuit 9 determines whether or not the accumulated lighting time T of the illumination lamp 13 is stored in the memory 23. If an affirmative determination is made in step S101, the process proceeds to step S103. If a negative determination is made, the process proceeds to step S102. In step S103, the control circuit 9 reads the cumulative lighting time T from the memory 23, and proceeds to step S104. In step S102, the control circuit 9 regards the illumination lamp 13 as being turned on for the first time and sets the cumulative lighting time T = 0.

In step S104, the control circuit 9
Determines whether the cumulative lighting time T is smaller than t1A. If an affirmative determination is made in step S104, the process proceeds to step S107, and if a negative determination is made, the process proceeds to step S105. In step S107, the control circuit 9 reads the emission spectrum distribution characteristics shown in FIG. 3A from the memory in the control circuit 9, sets the flag F = 0, and proceeds to step S110.

In step S105, the control circuit 9
Determines whether the cumulative lighting time T is smaller than t2A. If a positive determination is made in step S105, the process proceeds to step S108, and if a negative determination is made, the process proceeds to step S109. In step S108, the control circuit 9 reads the emission spectrum distribution characteristics shown in FIG. 3B from the memory in the control circuit 9, sets the flag F = 1, and proceeds to step S110.

In step S109, the control circuit 9
Reads out the emission spectrum distribution characteristic shown in FIG. 3C from the memory in the control circuit 9 and executes step S11.
Go to 0.

In step S110, the control circuit 9
Reads the data of the color separation / synthesis characteristics of the optical system 6 from the memory in the control circuit 9. Then, as described above, both of the characteristic data of the emission spectrum distribution characteristic and the color separation / synthesis characteristic are multiplied by the above equations (1) to (3) for each corresponding wavelength. Then, R emitted from the projection lens 7
Based on the light amounts of the respective components of the colors, G and B, the amplification factor for the signal of each color is obtained and set in the correction circuit 4. When the control circuit 9 sets the amplification factor for the correction circuit 4, the process proceeds to step S111.

In step S111, the control circuit 9
Outputs a signal for turning on the switch 16, and proceeds to step S112. In step S112, the control circuit 9 causes the timing circuit 10 to start timing. In step S113, the control circuit 9 determines whether or not the time tx has elapsed from the timing result of the timing circuit 10. If a positive determination is made in step S113, the process proceeds to step S114. If a negative determination is made, the determination process in step S113 is repeated. The time tx is a write cycle time for writing the cumulative lighting time of the illumination lamp 13 into the memory 23. Time tx
Is set to, for example, 15 (seconds).

In step S114, the control circuit 9
Reads the cumulative lighting time T from the memory 23 and calculates T = T
After calculating + tx and overwriting the new cumulative lighting time T in the memory 23, the process proceeds to step S115. In step S115, the control circuit 9 determines whether the flag F = 0. If an affirmative determination is made in step S115, step S11 is performed.
Then, if the determination is negative, the process proceeds to step S116. In step S117, the control circuit 9 determines whether the cumulative lighting time T satisfies t1A ≦ T <t2A. If an affirmative determination is made in step S117, the process proceeds to step S118,
If a negative determination is made, the process proceeds to step S123.

In step S118, the control circuit 9
Read the emission spectrum distribution characteristic shown in FIG. 3B from the memory in the control circuit 9 and read the flag F
= 1 is set, and the process proceeds to step S119. Step S
At 119, the control circuit 9 reads data of the color separation / combination characteristics of the optical system 6 from a memory in the control circuit 9. Then, as described above, both of the characteristic data of the emission spectrum distribution characteristic and the color separation / synthesis characteristic are multiplied by the above equations (1) to (3) for each corresponding wavelength. Then, based on the calculated light amounts of the R, G, and B components emitted from the projection lens 7, an amplification factor for each color signal is obtained and set in the correction circuit 4. When the control circuit 9 sets the amplification factor for the correction circuit 4, the process proceeds to step S123.

In step S116, the control circuit 9
Determines whether the flag F = 1. Step S116
If the determination is affirmative, the process proceeds to step S120, and if the determination is negative, the process proceeds to step S123. In step S120, the control circuit 9 determines whether the cumulative lighting time T satisfies T ≧ t2A. If a positive determination is made in step S120, the process proceeds to step S121, and if a negative determination is made, step S121 is performed.
Go to 123.

In step S121, the control circuit 9
Read the emission spectrum distribution characteristic shown in FIG. 3C from the memory in the control circuit 9 and read the flag F
= 2 and the process proceeds to step S122. Step S
At 122, the control circuit 9 reads the data of the color separation / combination characteristics of the optical system 6 from the memory in the control circuit 9. Then, as described above, both of the characteristic data of the emission spectrum distribution characteristic and the color separation / synthesis characteristic are multiplied by the above equations (1) to (3) for each corresponding wavelength. Then, based on the calculated light amounts of the R, G, and B components emitted from the projection lens 7, an amplification factor for each color signal is obtained and set in the correction circuit 4. When the control circuit 9 sets the amplification factor for the correction circuit 4, the process proceeds to step S123.

In step S123, the control circuit 9
Determines whether an instruction to turn off the illumination lamp 13 has been issued. If an affirmative determination is made in step S123, the process proceeds to step S123a, and if a negative determination is made, the process proceeds to step S124. In step S123a, the control circuit 9 outputs a signal for turning off the switch 16, and outputs the signal to step S12a.
Go to 5. In step S125, the control circuit 9
The timing circuit 10 stops timing. Step S12
In 6, the control circuit 9 determines whether or not an instruction to turn on the illumination lamp 13 has been given. If an affirmative determination is made in step S126, the process returns to step S111, and if a negative determination is made, the process proceeds to step S127. In step S127, the control circuit 9 determines whether the main switch 27 has been turned off. If an affirmative determination is made in step S127, the process of FIG. 4 is terminated, and if a negative determination is made in step S127, the process returns to step S126.

In step S124, to which the operation proceeds after making a negative determination in step S123, the control circuit 9 determines whether the main switch 27 has been turned off. If an affirmative determination is made in step S124, the processing in FIG. 4 ends, and if a negative determination is made in step S124, the process returns to step S113.

Next, the operation of determining the life of the illumination lamp 13 of the projection display device 1 will be described with reference to a flowchart showing the processing performed by the control circuit 9. FIG.
The outline of the life determination of the illumination lamp 13 performed by using the terminal voltage 10 minutes after the lighting instruction of the illumination lamp 13 and the rate of increase of the terminal voltage for 5 minutes after the lighting lamp 13 starts lighting. It is a flowchart explaining. In step S200, the control circuit 9 determines that the main switch 2
When the switch 7 is turned on, a signal for turning on the switch 18 is output, and the program shown in the flowchart of FIG. 5 is started. In step S201, the control circuit 9 sets a flag F1 = 0. Flag F1
Is a flag indicating whether data of the terminal voltage of the illumination lamp 13 and data of the rate of increase of the terminal voltage are stored in the memory 23. Lighting lamp 13 that lights up for the first time
Is stored in the memory 23, F1 =
0, F1 = 1 when not stored.

In step S202, the control circuit 9
Is the data of the illumination lamp 13 in the memory 23, that is,
It is determined whether or not the terminal voltage 10 minutes after the lighting instruction and the data of the rate of increase of the terminal voltage for 5 minutes after the start of the lighting are stored. If an affirmative determination is made in step S202, the process proceeds to step S204, and if a negative determination is made, the process proceeds to step S203. In step S203, the control circuit 9 sets the flag F1 = 1 and proceeds to step S204
Proceed to.

In step S204, the control circuit 9
Determines whether an instruction to turn on the illumination lamp 13 has been issued. If an affirmative determination is made in step S204, the process proceeds to step S204a, and if a negative determination is made, the process proceeds to step S221. In step S204a, the control circuit 9 outputs a signal for turning on the switch 16, and outputs a signal to step S20.
Go to 5. In step S221, the control circuit 9
It is determined whether the main switch 27 has been turned off. If an affirmative determination is made in step S221, the processing in FIG.
If a negative determination is made in step S221, the process returns to step S204.

In step S205, the control circuit 9
Determines whether flag F1 = 0. Step S20
If an affirmative determination is made in step 5, the process proceeds to step S212. If a negative determination is made, the process proceeds to step S205a. Step S205a
In, the control circuit 9 causes the timer circuit 10 to start timing, and determines whether or not the time ty has elapsed from the timing result of the timing circuit 10. If an affirmative determination is made in step S205a, the process proceeds to step S206. If a negative determination is made, the determination process in step S205a is repeated. The time ty represents the elapsed time from the lighting instruction of the illumination lamp 13, and for example,
5 minutes are set. In step S206, the control circuit 9 takes in the terminal voltage of the illumination lamp 13 via the detection circuit 25, calculates the rate of increase in the terminal voltage of the illumination lamp 13, and proceeds to step S207. In step S207, the control circuit 9 stores the calculated increase rate VJ of the lamp voltage in the memory 23, and proceeds to step S208.

In step S208, the control circuit 9
Determines whether or not the time tz has elapsed from the time measurement result of the time measurement circuit 10. If a positive determination is made in step S208, the process proceeds to step S209, and if a negative determination is made, step S2 is performed again.
08 is repeated. Time tz is the lighting lamp 13
Represents the elapsed time from the lighting instruction, for example, 10 minutes is set. In the present embodiment, since five minutes are counted in step S205, five minutes are counted in step S208.
The minute is counted. In step S209, the control circuit 9
Captures the terminal voltage of the illumination lamp 13 via the detection circuit 25, and proceeds to step S210. , Step S21
At 0, the control circuit 9 stores the acquired terminal voltage in the memory 23 as the terminal voltage VL of the illumination lamp 13 after being electrically stabilized, and proceeds to step S210a. In step S210a, the control circuit 9 sets the flag F1 = 0.
Is set and the process proceeds to step S219.

In step S212, in which the affirmative determination is made in step S205, the control circuit 9 reads the ramp rate VJ of the lamp voltage stored in the memory 23, and proceeds to step S212a. In step S212a, the control circuit 9 causes the timer circuit 10 to start timing, and determines whether or not the time ty has elapsed from the timing result of the timing circuit 10. If a positive determination is made in step S212a, the process proceeds to step S213. If a negative determination is made, the determination process in step S212a is repeated again. The time ty represents an elapsed time from a lighting instruction of the illumination lamp 13, and is, for example, 5
The minute is set. In step S213, the control circuit 9 takes in the terminal voltage of the illumination lamp 13 via the detection circuit 25, calculates the rise rate VJ1 of the terminal voltage of the illumination lamp 13, and proceeds to step S214. In step S214, the control circuit 9 determines the calculated ramp-up rate VJ1 of the lamp voltage.
Is compared with the ramp rate VJ of the lamp voltage read from the memory 23 in step S212. That is, (VJ1-VJ) <X
It is determined whether or not. Here, X is a predetermined value.

If an affirmative determination is made in step S214, the process proceeds to step S211. If a negative determination is made, the process proceeds to step S215. In step S215, the control circuit 9 sets the LE
By blinking D26, it is notified that the life of the illumination lamp 13 is near. Note that the LED 26 is normally turned off.

In step S211, the control circuit 9
Is the terminal voltage VL of the illumination lamp 13 stored in the memory 23, that is, the lamp voltage VL after being electrically stabilized.
Is read and the process proceeds to step S216. Step S21
At 6, the control circuit 9 determines whether or not the time tz has elapsed from the time measurement result of the time measurement circuit 10. Step S21
If an affirmative determination is made in step 6, the process proceeds to step S217. If a negative determination is made, the determination process in step S216 is repeated again. The time tz represents the elapsed time from the lighting instruction of the illumination lamp 13, and is set to, for example, 10 minutes. That is, since five minutes have already been measured in step S212a, five minutes are measured in step S216. In step S217, the control circuit 9 takes in the terminal voltage VL1 of the illumination lamp 13 via the detection circuit 25, and proceeds to step S218. In step S218, the control circuit 9 stores the acquired lamp voltage VL1 in the memory 23 in step S211.
Is compared with the lamp voltage VL read out from the memory. That is, (V
It is determined whether or not (L1-VL) <Y. Here, Y is a predetermined value.

If an affirmative determination is made in step S218, the process proceeds to step S219, and if a negative determination is made, the process proceeds to step S220. In step S220, the control circuit 9 sets the LE
By blinking D26, it is notified that the life of the illumination lamp 13 is near. Note that the LED 26 is normally turned off.
In step S219, the control circuit 9 determines whether or not an instruction to turn off the illumination lamp 13 has been given. If an affirmative determination is made in step S219, the process proceeds to step S219a, and if a negative determination is made, the process returns to step S217. In step S219a, the control circuit 9 outputs a signal for turning off the switch 16, and returns to step S204.

The operation for determining the life of the illumination lamp 13 and another operation for determining the life thereof will be described. FIG. 6 is a flowchart illustrating an outline of the life determination of the illumination lamp 13 performed by using a rising rate with respect to the lamp voltage at the time of the previous lighting. In step S300, when the main switch 27 is turned on, the control circuit 9 outputs a signal for turning on the switch 18, and starts the program shown in the flowchart of FIG. In step S301, the control circuit 9 sets a flag F1 = 0.
The flag F1 is a flag indicating whether or not the lamp voltage data is stored in the memory 23, as described above. The data of the illumination lamp 13 which is turned on for the first time is stored in the memory 2
3 is set to F1 = 0 when not stored, and F1 = 1 when not stored.

In step S302, the control circuit 9
Determines whether an instruction to turn on the illumination lamp 13 has been issued. If a positive determination is made in step S302, the process proceeds to step S302a, and if a negative determination is made, the determination process is repeated. In step S302a, the control circuit 9 outputs a signal for turning on the switch 16, and outputs the signal to step S303.
Proceed to. In step S303, the control circuit 9 determines whether or not the data of the illumination lamp 13, that is, the data of the lamp voltage at the last lighting is stored in the memory 23. If a positive determination is made in step S303, step S
The process proceeds to 305, and if a negative determination is made, the process proceeds to step S304. In step S304, the control circuit 9 sets the flag F1 = 1 and proceeds to step S305.

In step S305, the control circuit 9
Starts the timing of the timing circuit 10,
It is determined whether or not the time tz has elapsed from the result of the time measurement. If a positive determination is made in step S305, the process proceeds to step S306. If a negative determination is made, the determination process in step S305 is repeated again. The time tz represents the elapsed time from the lighting instruction of the illumination lamp 13, and is set to, for example, 10 minutes. In step S306, the control circuit 9 takes in the terminal voltage VL1 of the illumination lamp 13 via the detection circuit 25, and proceeds to step S307. In step S307, the control circuit 9 determines whether or not the flag F1 = 0. If an affirmative determination is made in step S307, the process proceeds to step S310. If a negative determination is made, the process proceeds to step S308. Step S30
In step 8, the control circuit 9 stores the lamp voltage VL1 fetched in step S306 in the memory 23 as the lamp voltage VL, and proceeds to step S309. In step S309, the control circuit 9 sets the flag F1 = 0, and proceeds to step S313.

In step S310, the control circuit 9
Stores the lamp voltage VL stored at the time of the previous lighting in the memory 2
3 and proceeds to step S311. Step S
In 311, the control circuit 9 compares the lamp voltage VL 1 fetched in Step S 306 with the lamp voltage VL read from the memory 23 in Step S 310. That is, it is determined whether or not (VL1-VL) <Z. Here, Z is a predetermined value.

If an affirmative determination is made in step S311, the process proceeds to step S313, and if a negative determination is made, the process proceeds to step S312. In step S312, the control circuit 9 sets the LE
By blinking D26, it is notified that the life of the illumination lamp 13 is near. Note that the LED 26 is normally turned off.
In step S313, the control circuit 9 determines whether or not an instruction to turn off the illumination lamp 13 has been given. If an affirmative determination is made in step S313, the process proceeds to step S313a. If a negative determination is made, the process of step S313 is repeated. In step S313a, the control circuit 9 outputs a signal for turning off the switch 16, and outputs the signal to step S313.
Proceed to b.

In step S313b, the control circuit 9
Stores the lamp voltage VL1 fetched in step S306 in the memory 23 as the lamp voltage VL.
Go to 5. In step S315, the control circuit 9
It is determined whether the main switch 27 has been turned off. If an affirmative determination is made in step S315, the processing in FIG.
If a negative determination is made in step S315, the process proceeds to step S314. In step S314, the control circuit 9 determines whether an instruction to turn on the illumination lamp 13 has been given. If an affirmative determination is made in step S314, step S31 is reached.
The process proceeds to 4a, and if a negative determination is made, the process returns to step S315.
In step S314a, the control circuit 9 outputs a signal for turning on the switch 16, and returns to step S305.

In the above description, the processes in the flowcharts of FIGS. 4, 5 and 6 have been described as individual processes, but these processes may be performed simultaneously as parallel processes.

According to the first embodiment described above,
The following operational effects can be obtained. (1) The memory 23 is provided in the lamp unit 12 having the illumination lamp 13 and each time the illumination lamp 13 is turned on,
The cumulative lighting time T is measured and stored in the memory 23. Therefore, the control circuit 9 controls the old illumination lamp 13
Is used, the cumulative lighting time T of the illumination lamp 13 can be detected. In addition, the operator operates the lamp unit 12.
When the lamp is replaced with another lamp unit 12, the cumulative lighting time T does not need to be reset. As a result, the lighting lamp 1
3 becomes easy, and the projection display device 1 becomes easy to use. (2) The emission spectrum distribution characteristics of the illumination lamp 13 when the accumulated lighting time is t0A, t1A, and t2A are stored in the memory 23, and the emission spectrum distribution characteristic is stored in the memory 23 according to the accumulated lighting time T of the illumination lamp 13. read out. The emission spectrum distribution characteristic and the color separation / synthesis characteristic of the optical system 6 are multiplied every 10 nm, and the light amount of each color component emitted from the projection lens 7 of the optical system 6 is calculated every 10 nm.
By setting the amplification factors for the R, G, and B signals in the correction circuit 4 so that the calculated light amount ratios of the R, G, and B components are set to a predetermined ratio, the projection type display device 1 performs projection. The color balance of the image to be corrected is corrected. Therefore, even if the emission spectrum distribution characteristic changes according to the cumulative lighting time T of the illumination lamp 13, the color balance of the projected image can be properly corrected, and a high-quality projected image can be obtained. (3) Since the emission spectrum distribution characteristic of the illumination lamp 13 of the above (2) is stored in the memory 23 in the lamp unit 12, even when the emission spectrum distribution characteristic differs depending on the type of the illumination lamp 13, the emission of the illumination lamp 13 is obtained. Data according to characteristics can be stored. As a result, appropriate color balance correction can be performed regardless of the type of the illumination lamp 13. Further, since the characteristics of other illumination lamps are not stored in the memory 23, the storage capacity of the memory 23 can be reduced.

(4) The life of the illumination lamp 13 is determined by using the lamp voltage 10 minutes after the instruction to turn on the illumination lamp 13 and the ramp rate of the lamp voltage 5 minutes after the illumination lamp 13 starts lighting. To do. Regarding the increase rate of the lamp voltage for 5 minutes after the start of lighting, when the difference between the increase rate stored in the memory 23 and the measured increase rate is a predetermined value X or more, it is determined that the life of the illumination lamp 13 is near. If the difference between the lamp voltage 10 minutes after the lighting instruction stored in the memory 23 and the measured lamp voltage is equal to or more than the predetermined value Y, it is determined that the life of the illumination lamp 13 is near. When it is determined that the life is near, the LED 26 is blinked to notify the user. As a result, the life is determined each time the lighting lamp 13 is instructed to light, so that the user can prepare a replacement lighting lamp 13 in advance when the life is near. (5) The life of the illumination lamp 13 is determined by using the lamp voltage of the illumination lamp 13 at the last lighting. When the difference between the lamp voltage 10 minutes after the lighting instruction and the lamp voltage at the time of the previous lighting is equal to or more than a predetermined value Z, the illumination lamp 13
Are determined to be near life. The lamp voltage at the last lighting is
It is stored in the memory 23. When it is determined that the life is near, the LED 26 is blinked to notify the user. As a result, similarly to the above (4), the user can prepare the replacement illumination lamp 13 in advance. (6) When the illumination lamp 13 is turned on for the first time, even if data such as a lamp voltage is not stored in the memory 23, a new lamp voltage is measured and stored in the memory 23;
The life of the illumination lamp 13 is determined using this data. Therefore, the life of the illumination lamp 13 can be determined regardless of whether data such as a lamp voltage is stored in the memory 23.

The predetermined values X, Y and Z described above are stored in the memory 2.
3 may be stored. In this case, the control circuit 9 reads X, Y, and Z stored in the memory 23 and uses them in the above-described determination processing. As a result, when the predetermined values X, Y, and Z are different depending on the type of the illumination lamp 13, a predetermined value suitable for the illumination lamp 13 being used is stored in the memory 23, so that an optimal determination process can be performed. It can be carried out.

Second Embodiment A memory for storing data such as a lamp voltage can be provided in the projection display device. FIG. 7 is a block diagram illustrating an outline of a projection display device according to the second embodiment of the present invention. 7, the projection display device 1a differs from the projection display device 1 of FIG. 1 in having a memory 23a. As the memory 23a, a nonvolatile memory such as an EEPROM or a flash memory is used, and the contents stored in the memory 23a are retained even when power is not supplied to the projection display device 1a. Other blocks in FIG. 7 that are common to the projection display device 1 in FIG. 1 are denoted by the same reference numerals as in FIG. 1.
The lamp unit 12a is mounted in the slot 22 of the projection display 1a. The lamp unit 12a includes an illumination lamp 13, which is a xenon lamp, for example.
Unlike the first embodiment, the lamp unit 12a
Has no memory. By mounting the lamp unit 12 a in the slot 22, the illumination lamp 13 is connected to the lighting circuit 11 and the detection circuit 25 via the connector 14.

The lamp unit 12'a is a lamp unit having an illumination lamp 13 'of a different type such as a halogen lamp. The lamp unit 12'a is mounted on the projection display device 1a instead of the lamp unit 12a. By mounting the lamp unit 12'a in the slot 22, the illumination lamp 13 'is connected to the lighting circuit 11 and the detection circuit 25 via the connector 14'.

The connectors 14 and 14 'have the same shape and each have a first predetermined pin and a second predetermined pin. The connector 14 has a first predetermined pin grounded and a second predetermined pin.
Are disconnected. On the other hand, connector 1
In 4 ', a first predetermined pin is disconnected and a second predetermined pin is grounded. Therefore, the control circuit 9 distinguishes between the lamp units 12a and 12′a by detecting the voltages of the first predetermined pin and the second predetermined pin with respect to the lamp unit mounted in the slot 22, to thereby determine the lighting unit. The lamps 13 and 13 'are determined. here,
The lamp type of the illumination lamp 13 is called a lamp A, and the lamp type of the illumination lamp 13 'is called a lamp B.
The detection of the voltage of the first and second predetermined pins is performed by the detection circuit 25. The detection circuit 25 also detects the lamp voltage as described in the first embodiment.

FIGS. 8A to 8C show illumination lamps 13 ',
That is, it is a diagram for explaining the emission spectrum of lamp B. FIG. 8A is a diagram illustrating an emission spectrum when the cumulative lighting time of the lamp B is t0B. FIG. 8B shows the lamp B
FIG. 4 is a diagram showing an emission spectrum at the cumulative lighting time of t1B (where t1B> t0B). FIG. 8C is a diagram illustrating an emission spectrum when the cumulative lighting time of the lamp B is t2B (where t2B> t1B). 8A to 8C, the horizontal axis represents the wavelength of light emitted from the lamp B.
The vertical axis represents the energy of emitted light. FIG.
8A to 8C, as the cumulative lighting time of the lamp B increases, the energy of the wavelength component corresponding to the G color decreases as compared with the wavelength components corresponding to the other colors. In the present embodiment, it is assumed that t0B = 0 (time).

The memory 23a stores the emission spectrum distribution characteristic data of the illumination lamp 13, ie, the lamp A, shown in FIGS. 3 (a) to 3 (c), and FIGS. 8 (a) to 8 (c). Are stored, for example, for each 10 nm wavelength. Also, memory 2
3a stores a table of lamp voltage data for each cumulative lighting time for each of the lamps A and B. After determining the type of the lamp, the control circuit 9 measures the lamp voltage, reads out the corresponding lamp voltage data from the memory 23a, and obtains the cumulative lighting time of the illumination lamp. Then, according to the obtained cumulative lighting time, the emission spectrum distribution characteristic data of the corresponding lamp is read from the memory 23a.

On the other hand, the control circuit 9
The color separation / combination characteristic data of the optical system 6 stored in 3a is read. Then, the read emission spectrum distribution characteristic and the color separation / synthesis characteristic of the optical system 6 are multiplied for each wavelength of 10 nm, and the respective color components emitted from the projection lens 7 of the optical system 6 are expressed by the above equations (1) to (3). Is calculated for each wavelength of 10 nm. By setting the amplification factors for the R, G, and B signals in the correction circuit 4 so that the calculated light amount ratios of the R, G, and B color components are set to a predetermined ratio, the projection type display device 1a performs projection. The color balance of the image to be corrected is corrected.

Next, the brightness Y of the image projected by the projection display device 1a is corrected as follows. Consider a case where the number of lamp units mounted is 12 and the cumulative lighting time T of the lamp A is t0A. At this time, the light amount ratio of each color is B: G: R = 1: 1: 1, and the brightness Y is Y = 0.
Assume that given by 6.G + 0.3.R + 0.1.B. The brightness in this case is Y (t0A) = 0.6 × 1 +
0.3 × 1 + 0.1 × 1 = 1. Cumulative lighting time T
At t1A, the light quantity ratio of each color is B: G: R = 0.
6: 0.8: 1.2. The control circuit 9 increases the amplification factor for the B color component to 0.8 / 0.6 times and the amplification factor for the R color component to 0.8 / 0.6 in order to correct the color balance.
A command is issued to the correction circuit 4 so as to set it to /1.2 times.
Then, the brightness is Y (t1A) = 0.6 × 0.8 + 0.3
× 0.8 + 0.1 × 0.8 = 0.8, which is smaller than the brightness Y (t0A) = 1 before the color balance correction.

To correct this decrease in brightness, the control circuit 9 sets the amplification factor for all the R, G, B color components to 1 / 0.8 = 1.25 when the cumulative lighting time T is t1A. A command is issued to the correction circuit 4 so as to double the value. That is, B
The amplification factor for the color component is 0.8 / 0.6 / 0.8 = 1.
67 times, the amplification factor for the G color component to 1.25 times, R
The amplification factor for the color component is 0.8 / 1.2 / 0.8 = 0.
83 times. As a result, the value of the brightness Y becomes the same before and after the color balance correction.

The correction processing performed by the projection display device 1a will be described with reference to a flowchart showing the processing performed by the control circuit 9. FIG. 9 is a flowchart illustrating the first half of the process. In step S600, when the main switch 27 is turned on, the control circuit 9 outputs a signal for turning on the switch 18, and starts the program shown in the flowchart of FIG. Then, the flag F corresponding to the cumulative lighting time T is set to the initial value of 3. As for the flag F, F = 0 corresponds to the cumulative lighting time T = t0A or t0B, F = 1 corresponds to the cumulative lighting time T = t1A or t1B, and F = 3 corresponds to the cumulative lighting time T = t2A or t2B. I do. The control circuit 9 further includes
The flag L corresponding to the type of the illumination lamp is set to an initial value of 1. As for the flag L, L = 1 corresponds to the lamp A, and L
= 2 corresponds to lamp B.

In step S601, the control circuit 9
Distinguishes the lamp unit installed in the slot 22 and determines whether the lamp type is the lamp A or not. If an affirmative determination is made in step S601, the process proceeds to step S602, and if a negative determination is made, the process proceeds to step S603. In step S602, the control circuit 9 sets the flag L = 1 and proceeds to step S604. In step S603, the control circuit 9 sets the flag L = 2, and proceeds to step S604.

In step S604, the control circuit 9
Determines whether an instruction to turn on the illumination lamp has been issued. If an affirmative determination is made in step S604, step S6 is reached.
Proceeding to step 05, if a negative determination is made, the processing of step S604 is repeated. In step S605, the control circuit 9
A signal for turning on the switch 16 is output and step S6 is performed.
Proceed to 06. In step S606, the control circuit 9
Starts the timekeeping in the timekeeping circuit 10,
It is determined whether or not the time ty has elapsed from the result of the time measurement. If a positive determination is made in step S606, the process proceeds to step S607, and if a negative determination is made, the determination process of step S606 is repeated again. The time ty represents an elapsed time from a lighting instruction of the illumination lamp 13, and is set to, for example, 10 minutes. In step S607, the control circuit 9 takes in the lamp voltage VL1 of the illumination lamp via the detection circuit 25, and proceeds to step S608.

In step S608, the control circuit 9
Measures whether flag L = 1. Step S608
If an affirmative determination is made in step S609, the process proceeds to step S609, and if a negative determination is made, the process proceeds to step S610. In step S609, the control circuit 9 reads, from the memory 23a, data indicating the relationship between the lamp voltage and the cumulative lighting time for the lamp A. Then, the data read from the memory 23a,
The cumulative lighting time TA of the lamp A is obtained from the lamp voltage VL1 taken in step S607.

In step S611, the control circuit 9
Determines whether or not TA <TLA is satisfied. However,
TLA is the average life of lamp A. Step S
If an affirmative determination is made in step 611, the process proceeds to step S704A in the flowchart of FIG. 10, and if a negative determination is made, step S7 is performed.
Proceed to 30. In step S730, the control circuit 9
Outputs a signal to turn off the switch 16, and proceeds to step S729. As a result, the lamp A is turned off. In step S729, the control circuit 9 blinks the LED 26 to notify the life of the illumination lamp. In addition, LED
26 is normally turned off.

On the other hand, in step S610, in which a negative determination is made in step S608 described above, the process proceeds to step S610.
Reads from the memory 23a data indicating the relationship between the lamp voltage and the cumulative lighting time for the lamp B. And
The data read from the memory 23a and the step S60
The cumulative lighting time TB of the lamp B is obtained from the lamp voltage VL1 taken in step 7.

In step S612, control circuit 9
Determines whether or not TB <TLB is satisfied. However,
TLB is the average lifetime of lamp B. Step S
If an affirmative determination is made in 612, the process proceeds to step S704B in the flowchart of FIG. 11, and if a negative determination is made, the process proceeds to step S730 described above.

FIG. 10 is a flowchart for explaining the latter half of the process for lamp A. In step S704A, the control circuit 9 determines whether the cumulative lighting time TA is smaller than t1A. If an affirmative determination is made in step S704A, the process proceeds to step S707A, and if a negative determination is made, the process proceeds to step S705A. In step S707A, the control circuit 9 reads the emission spectrum distribution characteristic of the lamp A shown in FIG.
The flag F = 0 is set, and the process proceeds to step S710A.

In step S705A, the control circuit 9
Determines whether the cumulative lighting time TA is smaller than t2A.
If an affirmative determination is made in step S705A, step S708 is performed.
A, and if a negative determination is made, the process proceeds to step S709A.
In step S708A, the control circuit 9 reads the emission spectrum distribution characteristic of the lamp A shown in FIG. 3B from the memory 23a, sets the flag F = 1, and proceeds to step S710A.

In step S709A, the control circuit 9
Reads the emission spectrum distribution characteristic of the lamp A shown in FIG.
Proceed to 10A.

In step S710A, control circuit 9
Stores the data of the color separation / combination characteristics of the optical system 6 in the memory 23a
Read from Then, as described above, for both characteristic data of the emission spectrum distribution characteristic and the color separation / synthesis characteristic,
The two are multiplied by the above equations (1) to (3) for each corresponding wavelength. Then, the calculated R emitted from the projection lens 7 is calculated.
Based on the amounts of light of the respective components of color, G, and B, an amplification factor for each color signal required for color balance and brightness correction is obtained and set in the correction circuit 4. After setting the amplification factor for the correction circuit 4, the control circuit 9 proceeds to step S712A.

At step S712A, the control circuit 9
Causes the timing circuit 10 to start timing. Step S
At 713A, the control circuit 9 determines whether or not the time tx has elapsed from the result of the time measurement by the time measurement circuit 10. If an affirmative determination is made in step S713A, the process proceeds to step S714A, and if a negative determination is made, the determination process of step S713A is repeated again. The time tx is a write cycle time for writing the cumulative lighting time of the illumination lamp in the memory 23a. Time tx is set to, for example, 15 (seconds).

In step S714A, the control circuit 9
Is the lamp voltage VL1 of the illumination lamp via the detection circuit 25.
And the process proceeds to step S714A ′. Step S
At 714A ', the control circuit 9 reads data indicating the relationship between the lamp voltage and the cumulative lighting time for the lamp A from the memory 23a. Then, the cumulative lighting time TA of the lamp A is newly obtained from the data read from the memory 23a and the lamp voltage VL1 fetched in step S714A ′, and T = TA.

In step S715A, the control circuit 9
Determines whether the flag F = 0. Step S715
If the determination is affirmative in A, the process proceeds to step S717A, and if the determination is negative, the process proceeds to step S716A. Step S717
A, the control circuit 9 determines that the cumulative lighting time T is t1A ≦ T
It is determined whether <t2A is satisfied. Step S717
If the determination is affirmative in A, the process proceeds to step S718A, and if the determination is negative, the process proceeds to step S723A.

In step S718A, the control circuit 9
Reads the emission spectrum distribution characteristic of the lamp A shown in FIG. 3B from the memory 23a, sets the flag F = 1, and proceeds to step S719A. In step S719A, the control circuit 9 reads data of the color separation / combination characteristics of the optical system 6 from the memory 23a. Then, as described above, both of the characteristic data of the emission spectrum distribution characteristic and the color separation / synthesis characteristic are multiplied by the above equations (1) to (3) for each corresponding wavelength. Then, based on the calculated light amounts of the R, G, and B components emitted from the projection lens 7, an amplification factor for each color signal necessary for color balance and brightness correction is obtained, and a correction circuit 4 is provided. Set to. When the control circuit 9 sets the amplification factor for the correction circuit 4, the process proceeds to step S723A.

In step S716A, to which the operation proceeds after making a negative determination in step S715A, the control circuit 9
It is determined whether the flag F = 1. If an affirmative determination is made in step S716A, the process proceeds to step S720A, and if a negative determination is made, the process proceeds to step S723A. In step S720A, the control circuit 9 determines whether or not the cumulative lighting time T satisfies T ≧ t2A. If an affirmative determination is made in step S720A, the process proceeds to step S721A, and if a negative determination is made, the process proceeds to step S723A.

In step S721A, the control circuit 9
Reads the emission spectrum distribution characteristic of the lamp A shown in FIG. 3C from the memory 23a, sets the flag F = 2, and proceeds to step S722A. In step S722A, the control circuit 9 reads data of the color separation / combination characteristics of the optical system 6 from the memory 23a. Then, as described above, both of the characteristic data of the emission spectrum distribution characteristic and the color separation / synthesis characteristic are multiplied by the above equations (1) to (3) for each corresponding wavelength. Then, based on the calculated light amounts of the R, G, and B components emitted from the projection lens 7, an amplification factor for each color signal necessary for color balance and brightness correction is obtained, and a correction circuit 4 is provided. Set to. When the control circuit 9 sets the amplification factor for the correction circuit 4, the process proceeds to step S723A.

In step S723A, the control circuit 9
Determines whether an instruction to turn off the illumination lamp has been issued. If a positive determination is made in step S723A, step S
The process proceeds to 725A, and if a negative determination is made, the process proceeds to step S724A. In step S725A, the control circuit 9 outputs a signal to turn off the switch 16, and causes the timer circuit 10 to stop timing, and proceeds to step S726.

In step S724A, to which the operation proceeds after making a negative determination in step S723A, the control circuit 9 determines whether the main switch 27 has been turned off. Step S
If an affirmative determination is made in 724A, the process of FIG. 10 is terminated, and if a negative determination is made in step S724A, the process returns to step S713A.

In step S726, control circuit 9
Determines whether an instruction to turn on the illumination lamp has been issued. If an affirmative determination is made in step S726, the process returns to step S605 of FIG. 9, and if a negative determination is made, the process proceeds to step S727. In step S727, the control circuit 9 determines whether the main switch 27 has been turned off. If an affirmative determination is made in step S727, the process of FIG. 10 is terminated, and if a negative determination is made in step S727, the process returns to step S726.

FIG. 11 is a flowchart for explaining the latter half of the process for lamp B. The flow of the processing in FIG. 11 is the same as the latter half of the processing for the lamp A in FIG. 10 described above, and a detailed description thereof will be omitted. That is, lamp B
In the case of (a), A among the codes indicating the number of steps in the flowchart is represented by B, and the cumulative lighting time TA is represented by TB, and FIGS.
8 (a) to 8 (c), the times t0A, t1A and t2A are respectively set to t0.
B, t1B and t2B may be replaced.

According to the second embodiment described above,
The following operational effects can be obtained. (1) A first predetermined pin and a second predetermined pin are provided on the connector 14 for connecting the projection display device 1a and the lamp unit, the first predetermined pin of the lamp unit 12a having the lamp A is grounded, and the lamp B Lamp unit 1 having
The second predetermined pin 2a was grounded. Therefore, the control circuit 9 detects the voltages of the first and second predetermined pins to thereby control the lamp units 12a and 12'a.
And lamp A and lamp B can be distinguished. Therefore, the operator does not need to set the type of the lamp on the projection display device 1a, so that the operation of the projection display device 1a can be simplified. (2) The projection display device 1a is provided with the memory 23a, and for each of the lamps A and B, data representing the relationship between the lamp voltage and the cumulative lighting time T is tabulated and stored in the memory 23a. Therefore, every time the lighting lamp is turned on, the data of the corresponding lamp can be read from the memory 23a to determine the cumulative lighting time. As a result, even when an old lighting lamp is used, the cumulative lighting time T of the lighting lamp can be known, and it is not necessary to reset the cumulative lighting time T when replacing the lighting lamp with another lighting lamp. Management becomes easier. Further, since it is not necessary to provide a memory for each of the lamp units 12a and 12'a, the cost of the lamp units 12a and 12'a can be reduced. (3) For each of the lamps A and B, the light emission spectrum distribution characteristics of the illumination lamp in the case where the cumulative lighting time is t0A, t1A and t2A are stored in the memory 23a, and according to the obtained cumulative lighting time T of the lighting lamp. , Read out the emission spectrum distribution characteristics from the memory 23a. The emission spectrum distribution characteristic and the color separation / synthesis characteristic of the optical system 6 are multiplied every 10 nm, and the light amount of each color component emitted from the projection lens 7 of the optical system 6 is calculated every 10 nm. The calculated light amount ratios of the R, G, and B color components are set to predetermined ratios, and the color balance is corrected, and the brightness is corrected so that the brightness does not change before and after the color balance correction. Therefore, a high-quality projected image can be obtained.

Steps S714A and S714 described above
At 714A ', the control circuit 9 measures the lamp voltage VL1, and obtains the cumulative lighting time T using the table data read from the memory 23a and the measured lamp voltage VL1. Instead, the cumulative lighting time T may be stored in the memory 23a, and the stored cumulative lighting time T may be read. In this case, the control circuit 9 reads the cumulative lighting time T from the memory 23a, and T = T +
The new cumulative lighting time T calculated as tx is stored in the memory 23.
It is sufficient to overwrite a and proceed to step S715A.

Although the projection type display device 1a has been described so as to selectively use two types of illumination lamps, lamp A and lamp B, three or more types of illumination lamps may be selectively used.

In the projection display devices 1 and 1a described above, the control circuit 9 turns on / off the switch 16 for turning on the illumination lamp 13 depending on the presence or absence of the input of the video signal from the external device 8. Instead of this, an operation switch for turning on / off the illumination lamp 13 may be provided. In this case, when an operation signal from the operation switch for turning on / off the illumination lamp 13 is input to the control circuit 9, the control circuit 9 instructs the switch 16 to be turned on / off according to the operation signal.

The correspondence between each component in the claims and each component in the embodiment of the invention will be described. The lamp units 12, 12a and 12'a correspond to the illumination unit, and the slot 22 corresponds to the illumination holding means. The liquid crystal panels P1 to P3 serve as image generating elements, the projection lens 7 serves as a projection optical system, the emission spectrum distribution characteristics serve as emission characteristics, the control circuit 9 serves as a judgment means, a lighting time detection means and a data updating means, and the correction circuit 4 serves as a correction circuit. Are the image signal processing means, the memory 23,
23a is storage means, connector 15 is reception means, connectors 14, 14 'are type indication means, detection circuit 25 is illumination type detection means, color balance correction is color balance processing, and brightness correction is brightness level. Each corresponds to an adjustment.

[0089]

According to the present invention as described in detail above, the following effects can be obtained. (1) In the projection type display device according to the first to tenth aspects of the present invention, the light emission characteristics of the illumination unit detachably mounted are determined, and the projection image is formed based on the image signal corrected based on the determination. Generated. Therefore, for example, even when a lighting unit having different light emission characteristics of the R, G, and B color components is mounted, the image signal is corrected by determining the light emission characteristics of the lighting unit. Thus, it is possible to project a high-quality image. (2) In particular, in the invention according to claim 3, the light emission characteristic data of the lighting unit is stored in the storage unit of the lighting unit. As a result, since only the light emission characteristic data of the corresponding lighting unit needs to be stored in the storage unit, the storage capacity of the storage unit can be reduced. (3) In particular, in the invention according to the fourth aspect, the lighting unit is provided with type indicating means so that the type of the lighting unit mounted from the projection display device side can be detected, and the light emission characteristic data of the lighting unit can be detected. Is stored in the storage means in the projection display device. Therefore, the light emission characteristic data corresponding to the type of the detected lighting unit can be read out from the storage means to determine the light emission characteristic.
As a result, the cost can be reduced as compared with the case where the storage means is provided in each of the plurality of lighting units to store the light emission characteristic data. (4) In the invention according to claim 5, in addition to the configuration of (3), the cumulative lighting time of the lighting unit is detected, and the light emission characteristic is determined based on the type of the lighting unit and the cumulative lighting time. I made it. Therefore, even when the light emission characteristics change according to the cumulative lighting time, a high-quality image can be projected regardless of the cumulative lighting time of the lighting unit. (5) In the invention according to claim 6, since the type of the mounted lighting unit is determined, for example,
Even when the light emission characteristics differ depending on the type of lighting unit, a high-quality image can be projected regardless of the light emission characteristics of the lighting unit. (6) In the invention according to claim 7, since the cumulative lighting time of the mounted lighting unit is determined, for example, even if the light emission characteristics differ depending on the cumulative lighting time, the cumulative lighting time of the lighting unit is determined. Regardless, a high-quality image can be projected. (7) According to the ninth aspect of the present invention, since the color balance processing is performed based on the determination of the light emission characteristics of the lighting unit, an image having an appropriate color balance is obtained regardless of the type of the mounted lighting unit. Can be projected. (8) According to the tenth aspect of the present invention, the brightness level is adjusted based on the determination of the light emission characteristics of the lighting unit. It becomes possible to project an image. (9) In the lighting unit according to the present invention, since the storage means for storing the light emission characteristic data is provided, only the light emission characteristic data of the lighting unit needs to be stored in the storage means. The storage capacity of the storage means can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an outline of a projection display device according to a first embodiment.

FIG. 2 is a diagram illustrating an optical system.

FIG. 3 shows (a) emission spectrum distribution characteristics at cumulative lighting time t0A, (b) emission spectrum distribution characteristics at cumulative lighting time t1A, (c) emission spectrum distribution characteristics at cumulative lighting time t2A, and (d) optical system color. It is a figure showing the decomposition | disassembly synthesis characteristic.

FIG. 4 is a flowchart illustrating color balance correction performed based on the cumulative lighting time of the illumination lamp.

FIG. 5 is a flowchart illustrating a life determination of an illumination lamp performed by using a terminal voltage 10 minutes after an instruction to turn on the illumination lamp and a rise rate of the terminal voltage during 5 minutes after the start of lighting of the illumination lamp. It is.

FIG. 6 is a flowchart illustrating a life determination of an illumination lamp performed using a rate of increase with respect to a lamp voltage at the time of last lighting.

FIG. 7 is a block diagram illustrating an outline of a projection display device according to a second embodiment.

FIGS. 8A and 8B are diagrams showing (a) emission spectrum distribution characteristics at a cumulative lighting time t0B, (b) emission spectrum distribution characteristics at a cumulative lighting time t1B, and (c) emission spectrum distribution characteristics at a cumulative lighting time t2B.

FIG. 9 is a first half flowchart illustrating color balance correction and brightness correction processing.

FIG. 10 is a flowchart of the latter half of the case of lamp A.

FIG. 11 is a flowchart of the latter half of the case of lamp B.

[Explanation of symbols]

1, 1a: Projection display device, 3: A / D converter, 4: Correction circuit, 5: Drive circuit, 6: Optical system, 7:
Projection lens, 8 external device,
9 control circuit, 10 timing circuit,
11: lighting circuit, 12, 12a, 12'a: lamp unit, 13, 13 ': illumination lamp, 14, 14', 15: connector, 16, 18, switch, 19: power supply circuit, 22: slot, 23, 23
a: memory, 24: fan, 25: detection circuit, 26: LED, 27 ...
Main switch, D1-D4 ... dichroic mirror, M1-M3 ... mirror,
P1: Liquid crystal panel for red, P2: Liquid crystal panel for green, P3: Liquid crystal panel for blue, S: Screen

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 9/31 H04N 9/31 Z (72) Inventor Takuya Shirahata 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Nikon Corporation F term (reference) 2H088 EA12 HA13 HA20 HA24 HA28 MA05 2H091 FA05Z FA10Z FA26X FA41Z LA15 LA30 5C058 AA06 AB03 BA29 BB25 EA00 EA11 EA51 5C060 BC05 DA03 DB01 GA00 HC01 HD01 JA14 JB06

Claims (13)

[Claims] An illumination unit for emitting illumination light; illumination holding means for detachably holding the illumination unit; and an image by modulating and emitting illumination light from the illumination unit based on an image signal. An image generating element for generating an image, a projection optical system for projecting an image of the image generating element, a judging unit for judging a light emission characteristic of the illumination unit, and an image for correcting the image signal based on the judgment of the judging unit. A projection display device, comprising: signal processing means. 2. The projection type display device according to claim 1, further comprising: storage means for storing light emission characteristic data of said lighting unit, wherein said judging means stores the light emission characteristic data of said lighting unit based on said light emission characteristic data. A projection type display device characterized by determining light emission characteristics. 3. The projection type display device according to claim 2, wherein said storage means is arranged in said lighting unit, and further comprises a receiving means for receiving said light emission characteristic data from said lighting unit and outputting to said judging means. A projection display device comprising: 4. The projection type display device according to claim 2, wherein a housing for housing said judging means and said image signal processing means, and a type indicator disposed on said lighting unit and indicating a type of said lighting unit. Means, and illumination type detecting means arranged in the housing and detecting the type of the lighting unit based on the type indicating means, wherein the storage means is housed in the housing, and the determining means Is a projection type display device, wherein the light emitting characteristic of the lighting unit is determined by reading out the light emitting characteristic data corresponding to the type of the lighting unit detected by the lighting type detecting means from the storage means. 5. The projection type display device according to claim 4, further comprising a lighting time detecting means for detecting a cumulative lighting time of said lighting unit, wherein said judging means detects said lighting type detecting means. Based on the type of the lighting unit and the cumulative lighting time detected by the lighting time detecting means, the light emitting characteristic of the lighting unit is determined by reading out the corresponding light emitting characteristic data from the storage means. Projection display device. 6. The projection display device according to claim 1, wherein the light emission characteristics are characteristics relating to a type of the lighting unit. 7. The projection display device according to claim 1, wherein the light emission characteristic is a characteristic relating to a cumulative lighting time of the lighting unit. 8. The projection type display device according to claim 7, wherein: storage means for storing characteristic data relating to the cumulative lighting time; and data for updating characteristic data relating to the cumulative lighting time in accordance with the cumulative lighting time. A projection display device, further comprising: updating means. 9. The projection type display device according to claim 1, wherein said image signal processing means performs color balance processing on said image signal based on the judgment of said judgment means. Display device. 10. The projection type display device according to claim 1, wherein said image signal processing means adjusts a luminance level of said image signal based on a judgment of said judgment means. Type display device. 11. A lighting unit detachable from a projection display device, comprising: a storage unit for storing light emission characteristic data of the lighting unit. 12. The lighting unit according to claim 11, wherein the light emission characteristics are characteristics relating to a type of the lighting unit. 13. The lighting unit according to claim 11, wherein the light emission characteristic is a characteristic relating to a cumulative lighting time of the lighting unit.