Light source device and projector

Abstract

To reduce the number and cost of parts.SOLUTION: A light source device is provided, comprising a first light source for emitting first light, a first sensor for detecting first measurements corresponding to temperature of the first light source, and a control unit for controlling output of the first light source according to the first measurements.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a light source device and a projector. [Background technology]

[0002] Patent document 1 discloses a projector that includes an external light intensity sensor that measures external illuminance and an internal light intensity sensor that measures the amount of light from a light source that has passed through a light modulation element, and that adjusts at least one of the light intensity of the light source and the brightness of an image based on the measurement values ​​obtained from these two sensors. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-154163 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described conventional technology, two light intensity sensors must be provided in the projector, which increases the number of parts and the part costs. [Means for solving the problem]

[0005] One embodiment of the light source device of the present invention comprises a first light source that emits first light, a first sensor that detects a first measurement value corresponding to the temperature of the first light source, and a control unit that controls the output of the first light source based on the first measurement value.

[0006] A projector according to one aspect of the present invention comprises a light source device according to the above aspect, a light modulation element that modulates light emitted from the light source device, and a projection optical system that projects the light modulated by the light modulation element. [Brief explanation of the drawings]

[0007] [Figure 1]1 is a block diagram schematically illustrating a configuration of a light source device according to a first embodiment. [Figure 2] FIG. 10 is a diagram showing an example of a measurement result of a light source output. [Figure 3] 10 is a flowchart showing a light source control process according to a second embodiment. [Figure 4] FIG. 10 is a block diagram schematically illustrating the configuration of a light source device according to a second embodiment. [Figure 5] 10 is a flowchart showing a light source control process according to a second embodiment. [Figure 6] FIG. 10 is a block diagram schematically showing the configuration of a light source device according to a third embodiment. [Figure 7] 10 is a flowchart showing a light source control process according to a third embodiment. [Figure 8] FIG. 1 is a diagram schematically illustrating a configuration of a projector including a light source device. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In the drawings below, the dimensions of the components may be shown on different scales to make them easier to see.

[0009] [First embodiment of light source device] Fig. 1 is a block diagram schematically showing the configuration of a light source device 10 according to the first embodiment. As shown in Fig. 1, the light source device 10 includes a first light source 11B, a second light source 11G, a third light source 11R, a light combining unit 12, a first light source driver 13B, a second light source driver 13G, a third light source driver 13R, a first sensor 14B, a second sensor 14G, a third sensor 14R, and a control unit 15.

[0010] The first light source 11B emits a first light BL. As an example, the first light source 11B emits blue light as the first light BL. For example, the first light source 11B may include one or more blue laser diodes to emit blue light as the first light BL. A first drive current is supplied to the first light source 11B from a first light source driver 13B. The output of the first light source 11B is controlled by the first drive current.

[0011] The second light source 11G emits the second light GL. As an example, the second light source 11G emits green light as the second light GL. For example, the second light source 11G may include one or more green laser diodes to emit the green light as the second light GL. A second drive current is supplied to the second light source 11G from a second light source driver 13G. The output of the second light source 11G is controlled by the second drive current.

[0012] The third light source 11R emits a third light RL. As an example, the third light source 11R emits red light as the third light RL. For example, the third light source 11R may include one or more red laser diodes to emit the red light as the third light RL. A third drive current is supplied to the third light source 11R from a third light source driver 13R. The output of the third light source 11R is controlled by the third drive current.

[0013] The light combining unit 12 combines the first light BL, the second light GL, and the third light RL. The light combining unit 12 emits white light WL obtained by combining the first light BL, the second light GL, and the third light RL. In other words, the light source device 10 emits white light WL.

[0014] The first light source driver 13B supplies a first driving current to the first light source 11B based on a first control signal output from the control unit 15. The value of the first driving current supplied from the first light source driver 13B to the first light source 11B is controlled by the control unit 15.

[0015] The second light source driver 13G supplies a second drive current to the second light source 11G based on a second control signal output from the control unit 15. The value of the second drive current supplied from the second light source driver 13G to the second light source 11G is controlled by the control unit 15.

[0016] The third light source driver 13R supplies a third driving current to the third light source 11R based on a third control signal output from the control unit 15. The value of the third driving current supplied from the third light source driver 13R to the third light source 11R is controlled by the control unit 15.

[0017] The first sensor 14B detects a first measurement value corresponding to the temperature of the first light source 11B. In this embodiment, the first measurement value is a temperature. The first measurement value is not limited to a temperature, and may be a voltage value applied to the first light source 11B, or the like. The first sensor 14B outputs an electrical signal indicating the first measurement value to the control unit 15.

[0018] The second sensor 14G detects a second measurement value corresponding to the temperature of the second light source 11G. In this embodiment, the second measurement value is a temperature. The second measurement value is not limited to a temperature, and may be a voltage value applied to the second light source 11G, or the like. The second sensor 14G outputs an electrical signal indicating the second measurement value to the control unit 15.

[0019] The third sensor 14R detects a third measurement value corresponding to the temperature of the third light source 11R. In this embodiment, the third measurement value is a temperature. The third measurement value is not limited to a temperature, and may be a voltage value applied to the third light source 11R, or the like. The third sensor 14R outputs an electrical signal indicating the third measurement value to the control unit 15. For example, each of the first sensor 14B, the second sensor 14G, and the third sensor 14R is a thermistor. Generally, a thermistor processes the output from the sensor as a voltage, so when the voltage is used as a measurement value, it can be processed directly as a value.

[0020] The control unit 15 individually controls the output of the first light source 11B, the output of the second light source 11G, and the output of the third light source 11R. As will be described in detail later, the control unit 15 controls the output of the first light source 11B based on a first measurement value detected by the first sensor 14B. The control unit 15 also controls the output of the second light source 11G based on a second measurement value detected by the second sensor 14G. The control unit 15 also controls the output of the third light source 11R based on a third measurement value detected by the third sensor 14R.

[0021] More specifically, the control unit 15 controls the output of the first light source 11B by controlling the first drive current supplied to the first light source 11B based on the first measurement value. The control unit 15 also controls the output of the second light source 11G by controlling the second drive current supplied to the second light source 11G based on the second measurement value. The control unit 15 also controls the output of the third light source 11R by controlling the third drive current supplied to the second light source 11R based on the third measurement value.

[0022] For example, the control unit 15 includes one or more processors and one or more memories. For example, the processor is configured by a CPU (Central Processing Unit). Some or all of the functions of the processor may be configured by circuits such as a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). The processor executes various processes in parallel or sequentially.

[0023] The memory includes nonvolatile memory that stores programs and various setting data required for the processor to execute various processes, and volatile memory that is used as a temporary storage location for data when the processor executes various processes. Examples of nonvolatile memory include EEPROM (Electrically Erasable Programmable Read-Only Memory) and flash memory. Examples of volatile memory include RAM (Random Access Memory).

[0024] Control parameters required to control first light source 11B, second light source 11G, and third light source 11R are stored in advance in the nonvolatile memory of control unit 15. A method for acquiring the control parameters required to control first light source 11B, second light source 11G, and third light source 11R will be described below. The method for acquiring the control parameters includes the following first to fifth steps.

[0025] (Step 1: Setting measurement conditions) In the first step, a plurality of different measurement conditions are set by combining a first measurement value corresponding to the temperature of the first light source 11B and a first drive current supplied to the first light source 11B. In the following description, the value of the first measurement value set as the measurement condition may be referred to as a temperature condition value, and the value of the first drive current set as the measurement condition may be referred to as a current condition value.

[0026] (Step 2: Measuring the light source output) In the second step, when the first light source 11B is driven under each measurement condition, the power of the first light BL emitted from the first light source 11B and the values ​​of the X, Y, and Z components in the CIE XYZ color system are measured. The CIE XYZ color system is an example of a first color system. In the following description, the measured power value may be referred to as a power measurement value, the measured X component value may be referred to as an X component measurement value, the measured Y component value may be referred to as a Y component measurement value, and the measured Z component value may be referred to as a Z component measurement value.

[0027] 2 is a diagram showing an example of the measurement result of the light source output. As shown in FIG. 2, for example, the temperature condition value Tc B0 and the current condition value Ic B0 When the first light source 11B is driven under the measurement conditions, the power measurement value Pm B0 , X component measurement value Xm B0 , Y component measurement value Ym B0 , and the Z component measurement value Zm B0 is obtained.

[0028] Also, as shown in FIG. 2, for example, the temperature condition value Tc B1 and the current condition value Ic B1 When the first light source 11B is driven under the measurement conditions, the power measurement value Pm B1 , X component measurement value Xm B1 , Y component measurement value Ym B1 , and the Z component measurement value Zm B1 is obtained.

[0029] Also, as shown in FIG. 2, for example, the temperature condition value Tc Bn and the current condition value Ic Bn When the first light source 11B is driven under the measurement conditions, the power measurement value Pm Bn , X component measurement value Xm Bn , Y component measurement value Ym Bn , and the Z component measurement value Zm Bn is obtained.

[0030] (Step 3: Calculation of constant output coefficient) In the third step, an output constant coefficient is calculated based on the temperature condition value, the current condition value, and the power measurement value. For example, as expressed by the following equation (1), the current condition value Ic B0 is the temperature condition value Tc B0 and the power measurement Pm B0 Similarly, as expressed by the following equation (2), the current condition value Ic Bn is the temperature condition value Tc Bn and the power measurement Pm Bn It can be expressed by a polynomial with variables Ic B1Other current condition values ​​such as can be expressed in a polynomial in the same way. In other words, the same number of polynomials as the number of measurement conditions can be obtained. In equations (1) and (2), the coefficient k B00 ~k Bij is the constant output coefficient.

[0031]

number

[0032] By converting the above polynomial into a determinant, the following equation (3) is obtained. By solving the simultaneous equations based on the following equation (3), the constant output coefficient k B00 ~k Bij Calculate.

[0033]

number

[0034] In the above formulas (1), (2), and (3), the relationship between n, i, and j is expressed by the following formula (4).

[0035]

number

[0036] (4th step: Obtaining standard values ​​for XYZ components) In the fourth step, the standard values ​​of the X, Y, and Z components are obtained. For example, one of the X component measurement values ​​is converted into the standard value X of the X component. B0 Also, one of the Y component measurement values ​​is acquired as the standard value Y B0 Furthermore, one of the Z component measurement values ​​is obtained as the standard value Z B0 Obtain as.

[0037] (5th step: Calculation of wavelength shift correction coefficient) In the fifth step, the wavelength shift correction coefficient is calculated. First, the spectrum of the first light BL emitted from the first light source 11B is measured and normalized so that the sum of the spectra is 1. Then, the value of the X component is calculated from the normalized spectrum. Then, the calculated value of the X component is multiplied by the standard value X of the X component. B0 The ratio of the X component is calculated by dividing by the temperature condition value when the spectrum was measured. The wavelength shift correction coefficient K BX Calculate.

[0038] Next, the Y component value is calculated from the normalized spectrum. The calculated Y component value is then used as the standard Y component value. B0 The ratio of the Y component is calculated by dividing by the temperature condition value when the spectrum was measured. The wavelength shift correction coefficient K BY Calculate.

[0039] Next, the value of the Z component is calculated from the normalized spectrum. The calculated value of the Z component is then used as the standard value Z B0 The ratio of the Z component is calculated by dividing by the temperature condition value when the spectrum was measured. The wavelength shift correction coefficient K BZ Calculate.

[0040] As described above, by carrying out the first to fifth steps for the first light source 11B, the constant output coefficient k B00 ~k Bij and the standard value of the X component, X B0 and the standard value of the Y component, Y B0 and the standard value of the Z component, Z B0 and the wavelength shift correction coefficient K for the X component BX and the wavelength shift correction coefficient K for the Y component BY and the wavelength shift correction coefficient K for the Z component BZ and is obtained.

[0041] Output constant coefficient k B00 ~k Bijis an example of a first coefficient preset in correspondence with the first light source 11B. B0 and the standard value of the Y component, Y B0 and the standard value of the Z component, Z B0 is an example of a first standard value expressed in the first color system and set in advance in correspondence with the first light source 11B. BX and the wavelength shift correction coefficient K for the Y component BY and the wavelength shift correction coefficient K for the Z component BZ is an example of a first correction coefficient that is set in advance in correspondence with the first light source 11B.

[0042] Similarly, by carrying out the above-described first to fifth steps for the second light source 11G, the constant output coefficient k G00 ~k Gij and the standard value of the X component, X G0 and the standard value of the Y component, Y G0 and the standard value of the Z component, Z G0 and the wavelength shift correction coefficient K for the X component GX and the wavelength shift correction coefficient K for the Y component GY and the wavelength shift correction coefficient K for the Z component GZ and is obtained.

[0043] Output constant coefficient k G00 ~k Gij is an example of a second coefficient preset in correspondence with the second light source 11G. G0 and the standard value of the Y component, Y G0 and the standard value of the Z component, Z G0 is an example of a second standard value expressed in the first color system and preset in accordance with the second light source 11G. GX and the wavelength shift correction coefficient K for the Y component GY and the wavelength shift correction coefficient K for the Z component GZ is an example of a second correction coefficient that is set in advance in correspondence with the second light source 11G.

[0044] Similarly, by carrying out the above-described first to fifth steps for the third light source 11R, the output constant coefficient k R00 ~k Rij and the standard value of the X component, X R0 and the standard value of the Y component, Y R0 and the standard value of the Z component, Z R0 and the wavelength shift correction coefficient K for the X component RX and the wavelength shift correction coefficient K for the Y component RY and the wavelength shift correction coefficient K for the Z component RZ and is obtained.

[0045] Output constant coefficient k R00 ~k Rij is an example of a third coefficient preset in correspondence with the third light source 11R. R0 and the standard value of the Y component, Y R0 and the standard value of the Z component, Z R0 is an example of a third standard value expressed in the first color system and preset in accordance with the third light source 11R. RX and the wavelength shift correction coefficient K for the Y component RY and the wavelength shift correction coefficient K for the Z component RZ is an example of a third correction coefficient that is preset in correspondence with the third light source 11R.

[0046] This concludes the description of the method for acquiring control parameters pre-stored in the nonvolatile memory of control unit 15. The light source control process executed by control unit 15 will be described below with reference to Fig. 3. Fig. 3 is a flowchart showing the light source control process executed by control unit 15.

[0047] 3, first, the control unit 15 sets a target value of the Y component and a target value of the color coordinates x and y (step S1). The target value of the Y component and the target value of the color coordinates x and y are examples of target values ​​expressed in the first color system.

[0048] Next, the control unit 15 measures the values ​​that change depending on the temperatures of the first light source 11B, the second light source 11G, and the third light source 11R (step S2). Specifically, the control unit 15 determines the measured value Tm of the first measurement value corresponding to the temperature of the first light source 11B based on the output signal of the first sensor 14B. B Furthermore, the control unit 15 acquires the measurement value Tm of the second measurement value corresponding to the temperature of the second light source 11G based on the output signal of the second sensor 14G. G Furthermore, the control unit 15 acquires the measurement value Tm of the third measurement value corresponding to the temperature of the third light source 11R based on the output signal of the third sensor 14R. R Get.

[0049] Next, the control unit 15 executes the wavelength shift correction process for the first light source 11B (step S3). Specifically, the control unit 15 corrects the wavelength shift of the first light source 11B by adjusting the standard value X B0 and the wavelength shift correction coefficient K for the X component BX Then, the control unit 15 reads out the measured value Tm of the first measurement value. B and the wavelength shift correction coefficient K for the X component BX and the standard value of the X component, X B0 Specifically, the control unit 15 corrects the standard value X of the X component. B0 and the wavelength shift correction coefficient K for the X component BX and the measured value Tm of the first measurement value B By substituting the above into the following equation (5), the reference value X of the X component for the first light source 11B is obtained. B1 Calculate.

[0050] Furthermore, the control unit 15 determines the standard value Y of the Y component among the control parameters related to the first light source 11B. B0 and the wavelength shift correction coefficient K for the Y component BY Then, the control unit 15 reads out the measured value Tm of the first measurement value. B and the wavelength shift correction coefficient K for the Y component BY and the standard value of the Y component, Y B0 Specifically, the control unit 15 corrects the standard value Y B0 and the wavelength shift correction coefficient K for the Y componentBY and the measured value Tm of the first measurement value B By substituting the above into the following equation (6), the reference value Y of the Y component for the first light source 11B is obtained. B1 Calculate.

[0051] Furthermore, the control unit 15 determines the standard value Z of the Z component among the control parameters related to the first light source 11B. B0 and the wavelength shift correction coefficient K for the Z component BZ Then, the control unit 15 reads out the measured value Tm of the first measurement value. B and the wavelength shift correction coefficient K for the Z component BZ and the standard value of the Z component Z B0 Specifically, the control unit 15 corrects the standard value Z of the Z component. B0 and the wavelength shift correction coefficient K for the Z component BZ and the measured value Tm of the first measurement value B By substituting the above into the following equation (7), the reference value Z of the Z component for the first light source 11B is obtained. B1 Calculate.

[0052]

number

[0053] Next, the control unit 15 executes the wavelength shift correction process for the second light source 11G (step S4). Specifically, the control unit 15 corrects the wavelength shift of the second light source 11G by adjusting the standard value X G0 and the wavelength shift correction coefficient K for the X component GX Then, the control unit 15 reads out the measured value Tm of the second measurement value. G and the wavelength shift correction coefficient K for the X component GX and the standard value of the X component, X G0 Specifically, the control unit 15 corrects the standard value X of the X component. G0 and the wavelength shift correction coefficient K for the X component GX and the measured value Tm of the second measurement G By substituting the above into the following equation (8), the reference value X of the X component for the second light source 11G is obtained. G1 Calculate.

[0054] Furthermore, the control unit 15 determines the standard value Y of the Y component among the control parameters related to the second light source 11G. G0 and the wavelength shift correction coefficient K for the Y component GY Then, the control unit 15 reads out the measured value Tm of the second measurement value. G and the wavelength shift correction coefficient K for the Y component GY and the standard value of the Y component, Y G0 Specifically, the control unit 15 corrects the standard value Y G0 and the wavelength shift correction coefficient K for the Y component GY and the measured value Tm of the second measurement G By substituting the above into the following equation (9), the reference value Y of the Y component for the second light source 11G is obtained. G1 Calculate.

[0055] Furthermore, the control unit 15 determines the standard value Z of the Z component among the control parameters related to the second light source 11G. G0 and the wavelength shift correction coefficient K for the Z component GZ Then, the control unit 15 reads out the measured value Tm of the second measurement value. G and the wavelength shift correction coefficient K for the Z component GZ and the standard value of the Z component Z G0 Specifically, the control unit 15 corrects the standard value Z of the Z component. G0 and the wavelength shift correction coefficient K for the Z component GZ and the measured value Tm of the second measurement G By substituting the above into the following equation (10), the reference value Z of the Z component for the second light source 11G is obtained. G1 Calculate.

[0056]

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[0057] Subsequently, the control unit 15 executes a wavelength shift correction process for the third light source 11R (step S5). Specifically, the control unit 15 corrects the wavelength shift of the third light source 11R by adjusting the standard value X R0and the wavelength shift correction coefficient K for the X component RX Then, the control unit 15 reads out the third measurement value Tm R and the wavelength shift correction coefficient K for the X component RX and the standard value of the X component, X R0 Specifically, the control unit 15 corrects the standard value X of the X component. R0 and the wavelength shift correction coefficient K for the X component RX and the third measurement value Tm R By substituting the above into the following equation (11), the reference value X of the X component for the third light source 11R is obtained. R1 Calculate.

[0058] Furthermore, the control unit 15 determines the standard value Y of the Y component among the control parameters related to the third light source 11R. R0 and the wavelength shift correction coefficient K for the Y component RY Then, the control unit 15 reads out the third measurement value Tm R and the wavelength shift correction coefficient K for the Y component RY and the standard value of the Y component, Y R0 Specifically, the control unit 15 corrects the standard value Y R0 and the wavelength shift correction coefficient K for the Y component RY and the third measurement value Tm R By substituting the above into the following equation (12), the reference value Y of the Y component for the third light source 11R is obtained. R1 Calculate.

[0059] Furthermore, the control unit 15 determines the standard value Z of the Z component among the control parameters related to the third light source 11R. R0 and the wavelength shift correction coefficient K for the Z component RZ Then, the control unit 15 reads out the third measurement value Tm R and the wavelength shift correction coefficient K for the Z component RZ and the standard value of the Z component Z R0 Specifically, the control unit 15 corrects the standard value Z of the Z component. R0 and the wavelength shift correction coefficient K for the Z component RZ and the third measurement value Tm RBy substituting the above into the following equation (13), the reference value Z of the Z component for the third light source 11R is obtained. R1 Calculate.

[0060]

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[0061] Subsequently, the control unit 15 executes a color matching process (step S6). Specifically, the control unit 15 adjusts the first power setting value Po B and the second power setting value Po G and the third power setting value Po R The target X component value is expressed by the following equation (14): The target Y component value is expressed by the following equation (15): The target Z component value is expressed by the following equation (16):

[0062]

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[0063] When the above equations (14), (15), and (16) are converted into determinants, the following equation (17) is obtained. The control unit 15 solves the simultaneous equations based on the following equation (17) to obtain the first power setting value Po B and the second power setting value Po G and the third power setting value Po R and calculate.

[0064]

number

[0065] Subsequently, the control unit 15 executes constant output processing for the first light source 11B (step S7). Specifically, the control unit 15 executes constant output processing for the first light source 11B by adjusting the constant output coefficient k B00 ~k BijThen, the control unit 15 reads out the constant output coefficient k B00 ~k Bij and the measured value Tm of the first measurement value B and the first power setting value Po B Based on this, the first drive current setting value If B Specifically, the control unit 15 calculates the constant output coefficient k B00 ~k Bij and the measured value Tm of the first measurement value B and the first power setting value Po B By substituting into the following equation (18), the first drive current setting value If B Calculate.

[0066]

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[0067] Next, the control unit 15 executes a constant output process for the second light source 11G (step S8). Specifically, the control unit 15 executes a constant output process for the second light source 11G by adjusting the constant output coefficient k G00 ~k Gij Then, the control unit 15 reads out the constant output coefficient k G00 ~k Gij and the measured value Tm of the second measurement G and the second power setting value Po G Based on this, the second drive current setting value If G Specifically, the control unit 15 calculates the constant output coefficient k G00 ~k Gij and the measured value Tm of the second measurement G and the second power setting value Po G By substituting into the following equation (19), the setting value of the second drive current If G Calculate.

[0068]

number

[0069] Next, the control unit 15 executes a constant output process for the third light source 11R (step S9). Specifically, the control unit 15 executes a constant output process for the third light source 11R by adjusting the constant output coefficient k R00 ~k Rij Then, the control unit 15 reads out the constant output coefficient k R00 ~k Rij and the third measurement value Tm R and the third power setting value Po R Based on this, the third drive current setting value If R Specifically, the control unit 15 calculates the constant output coefficient k R00 ~k Rij and the third measurement value Tm R and the third power setting value Po R By substituting into the following equation (20), the setting value of the third drive current If R Calculate.

[0070]

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[0071] Next, the control unit 15 controls the drive current supplied to each light source (step S10). Specifically, the control unit 15 determines whether the value of the first drive current supplied from the first light source driver 13B to the first light source 11B is equal to or greater than the set value If B Furthermore, the control unit 15 controls the first light source driver 13B so that the value of the second drive current supplied from the second light source driver 13G to the second light source 11G is equal to or greater than the set value If G Furthermore, the control unit 15 controls the second light source driver 13G so that the value of the third drive current supplied from the third light source driver 13R to the third light source 11R is equal to or greater than the set value If R The third light source driver 13R is controlled so that:

[0072] After completing the process of step S10, the control unit 15 returns to step S2 and repeatedly executes the processes from step S2 to step S10 at a predetermined cycle.

[0073] (Effects of the first embodiment) As described above, the light source device 10 of the first embodiment includes a first light source 11B that emits a first light BL, a second light source 11G that emits a second light GL, a third light source 11R that emits a third light RL, a first sensor 14B that detects a first measurement value corresponding to the temperature of the first light source 11B, a second sensor 14G that detects a second measurement value corresponding to the temperature of the second light source 11G, a third sensor 14R that detects a third measurement value corresponding to the temperature of the third light source 11R, and a control unit 15. The control unit 15 controls the output of the first light source 11B based on the first measurement value, controls the output of the second light source 11G based on the second measurement value, and controls the output of the third light source 11R based on the third measurement value. According to the light source device 10 described above, the outputs of the first light source 11B, the second light source 11G, and the third light source 11R are controlled using three sensors that are less expensive than the light intensity sensors used in the prior art, thereby reducing component costs. Furthermore, the outputs of the first light source 11B, the second light source 11G, and the third light source 11R are individually controlled based on the temperatures of the first light source 11B, the second light source 11G, and the third light source 11R, respectively, so the white light WL emitted from the light source device 10 can be controlled with high precision.

[0074] In the light source device 10 of the first embodiment, the control unit 15 controls the output of the first light source 11B by controlling the first drive current supplied to the first light source 11B based on the first measurement value. The control unit 15 also controls the output of the second light source 11G by controlling the second drive current supplied to the second light source 11G based on the second measurement value. The control unit 15 also controls the output of the third light source 11R by controlling the third drive current supplied to the third light source 11R based on the third measurement value. According to the light source device 10 described above, the output of the first light source 11B can be easily controlled by controlling the first drive current based on the first measurement value. Also, the output of the second light source 11G can be easily controlled by controlling the second drive current based on the second measurement value. Furthermore, the output of the third light source 11R can be easily controlled by controlling the third drive current based on the third measurement value.

[0075] In the light source device 10 of the first embodiment, the control unit 15 controls a target value (Yxy) expressed in the XYZ color system and a first standard value (X) expressed in the XYZ color system and set in advance corresponding to the first light source 11B. B0 , Y B0 , Z B0 ) and a second standard value (X G0 , Y G0 , Z G0 ) and a third standard value (X R0 , Y R0 , Z R0 ) based on which the first power setting value Po B and the second power setting value Po G and the third power setting value Po R The control unit 15 calculates the first coefficient (k B00 ~k Bij ) and the first power setting Po B Based on this, the first drive current setting value If B The control unit 15 calculates the second coefficient (k G00 ~k Gij ) and the second power setting Po G Based on this, the second drive current setting value If G The control unit 15 calculates the third coefficient (k R00 ~k Rij ) and the third power setting Po RBased on this, the third drive current setting value If R Calculate. According to the light source device 10 described above, it is possible to accurately calculate the set value of each drive current that can achieve the target value in accordance with the temperature change of each light source.

[0076] In the light source device 10 of the first embodiment, the control unit 15 controls the first power setting value Po B , second power setting value Po G and the third power setting value Po R Before calculating the above, the first standard value is corrected based on the first measurement value and a first correction coefficient preset corresponding to the first light source 11B, the second standard value is corrected based on the second measurement value and a second correction coefficient preset corresponding to the second light source 11G, and the third standard value is corrected based on the third measurement value and a third correction coefficient preset corresponding to the third light source 11R. According to the light source device 10 described above, even if a wavelength shift occurs due to a temperature change in each light source, the first standard value, the second standard value, and the third standard value are temperature-corrected, so that the setting value of each drive current can be calculated accurately in accordance with the temperature change of each light source.

[0077] [Second embodiment of light source device] Fig. 4 is a block diagram schematically showing the configuration of a light source device 20 according to the second embodiment. As shown in Fig. 4, the light source device 20 includes a first light source 21, a second light source 22, a phosphor 23, a light combining unit 24, a first light source driver 25, a second light source driver 26, a first sensor 27, a second sensor 28, and a control unit 29.

[0078] The first light source 21 emits a first light BL1. As an example, the first light source 21 emits blue light as the first light BL1. For example, the first light source 21 may include one or more blue laser diodes to emit blue light as the first light BL1. A first drive current is supplied to the first light source 21 from a first light source driver 25. The output of the first light source 21 is controlled by the first drive current.

[0079] The second light source 22 emits a second light BL2. As an example, the second light source 22 emits blue light as the second light BL2. For example, the second light source 22 may include one or more blue laser diodes to emit blue light as the second light BL2. A second drive current is supplied to the second light source 22 from a second light source driver 26. The output of the second light source 22 is controlled by the second drive current.

[0080] The phosphor 23 converts the second light BL2 emitted from the second light source 22 into the fourth light YL, which is yellow light. The light combining unit 24 combines the blue first light BL1 with the yellow fourth light YL. The light combining unit 12 emits white light WL obtained by combining the first light BL1 and the fourth light YL. In other words, the light source device 20 emits white light WL.

[0081] The first light source driver 25 supplies a first drive current to the first light source 21 based on a first control signal output from the control unit 29. The value of the first drive current supplied from the first light source driver 25 to the first light source 21 is controlled by the control unit 29.

[0082] The second light source driver 26 supplies a second drive current to the second light source 22 based on a second control signal output from the control unit 29. The value of the second drive current supplied from the second light source driver 26 to the second light source 22 is controlled by the control unit 29.

[0083] The first sensor 27 detects a first measurement value corresponding to the temperature of the first light source 21. The first sensor 27 outputs an electrical signal indicating the first measurement value to the control unit 29. The second sensor 28 detects a second measurement value corresponding to the temperature of the second light source 22. The second sensor 28 outputs an electrical signal indicating the second measurement value to the control unit 29. For example, each of the first sensor 27 and the second sensor 28 is a thermistor.

[0084] The control unit 29 separately controls the output of the first light source 21 and the output of the second light source 22. As will be described in detail later, the control unit 29 controls the output of the first light source 21 based on a first measurement value detected by the first sensor 27. The control unit 29 also controls the output of the second light source 22 based on a second measurement value detected by the second sensor 28.

[0085] More specifically, the control unit 29 controls the output of the first light source 21 by controlling the first drive current supplied to the first light source 21 based on the first measurement value. Also, the control unit 29 controls the output of the second light source 22 by controlling the second drive current supplied to the second light source 22 based on the second measurement value.

[0086] For example, similar to the control unit 15 of the first embodiment, the control unit 29 includes one or more processors and one or more memories, and the non-volatile memory of the control unit 29 stores in advance control parameters required to control the first light source 21 and the second light source 22. The method of acquiring the control parameters is the same as in the first embodiment, and therefore will not be described repeatedly in the second embodiment.

[0087] The control parameters required for controlling the first light source 21 are the constant output coefficient k B00 ~k Bij and the standard value of the X component, X B0 and the standard value of the Y component, Y B0 and the standard value of the Z component, Z B0 and the wavelength shift correction coefficient K for the X component BX and the wavelength shift correction coefficient K for the Y component BY and the wavelength shift correction coefficient K for the Z component BZ and are stored in the memory.

[0088] In addition, as a control parameter required for controlling the second light source 22, a constant output coefficient k Y00 ~k Yij and the standard value of the X component, X Y0 and the standard value of the Y component, Y Y0 and the standard value of the Z component, Z Y0 and the wavelength shift correction coefficient K for the X componentYX and the wavelength shift correction coefficient K for the Y component YY and the wavelength shift correction coefficient K for the Z component YZ and are stored in the memory.

[0089] The light source control process executed by the control unit 29 will be described below with reference to Fig. 5. Fig. 5 is a flowchart showing the light source control process executed by the control unit 29.

[0090] 5, first, the control unit 29 sets a target value for the Y component and target values ​​for the color coordinates x and y (step S11). The target value for the Y component and the target values ​​for the color coordinates x and y are examples of target values ​​expressed in the first color system.

[0091] Next, the control unit 29 measures values ​​that change depending on the temperatures of the first light source 21 and the second light source 22 (step S12). Specifically, the control unit 29 determines the measured value Tm of the first measurement value corresponding to the temperature of the first light source 21 based on the output signal of the first sensor 27. B Furthermore, the control unit 29 acquires the measured value Tm of the second measurement value corresponding to the temperature of the second light source 22 based on the output signal of the second sensor 28. Y Get.

[0092] Subsequently, the control unit 29 executes a wavelength shift correction process for the first light source 21 (step S13). Specifically, the control unit 29 corrects the wavelength shift of the first light source 21 by adjusting the standard value X B0 and the wavelength shift correction coefficient K for the X component BX Then, the control unit 29 reads out the measured value Tm of the first measurement value. B and the wavelength shift correction coefficient K for the X component BX and the standard value of the X component, X B0 Specifically, the control unit 29 corrects the standard value X of the X component. B0 and the wavelength shift correction coefficient K for the X component BX and the measured value Tm of the first measurement value B By substituting the above equation (5), the reference value X of the X component for the first light source 21 is obtained. B1 Calculate.

[0093] Furthermore, the control unit 29 determines the standard value Y of the Y component among the control parameters related to the first light source 21. B0 and the wavelength shift correction coefficient K for the Y component BY Then, the control unit 29 reads out the measured value Tm of the first measurement value. B and the wavelength shift correction coefficient K for the Y component BY and the standard value of the Y component, Y B0 Specifically, the control unit 29 corrects the standard value Y B0 and the wavelength shift correction coefficient K for the Y component BY and the measured value Tm of the first measurement value B By substituting the above equation (6), the reference value Y of the Y component for the first light source 21 is obtained. B1 Calculate.

[0094] Furthermore, the control unit 29 determines the standard value Z of the Z component among the control parameters related to the first light source 21. B0 and the wavelength shift correction coefficient K for the Z component BZ Then, the control unit 29 reads out the measured value Tm of the first measurement value. B and the wavelength shift correction coefficient K for the Z component BZ and the standard value of the Z component Z B0 Specifically, the control unit 29 corrects the standard value Z of the Z component. B0 and the wavelength shift correction coefficient K for the Z component BZ and the measured value Tm of the first measurement value B By substituting the above equation (7), the reference value Z of the Z component for the first light source 21 is obtained. B1 Calculate.

[0095] Subsequently, the control unit 29 executes a wavelength shift correction process for the second light source 22 (step S14). Specifically, the control unit 29 corrects the wavelength shift of the second light source 22 by adjusting the standard value X Y0 and the wavelength shift correction coefficient K for the X component YX Then, the control unit 29 reads out the second measurement value Tm Y and the wavelength shift correction coefficient K for the X component YXand the standard value of the X component, X Y0 Specifically, the control unit 29 corrects the standard value X of the X component. Y0 and the wavelength shift correction coefficient K for the X component YX and the measured value Tm of the second measurement Y By substituting the above into the following equation (21), the reference value X of the X component for the second light source 22 is obtained. Y1 Calculate.

[0096] Furthermore, the control unit 29 determines the standard value Y of the Y component among the control parameters related to the second light source 22. Y0 and the wavelength shift correction coefficient K for the Y component YY Then, the control unit 29 reads out the second measurement value Tm Y and the wavelength shift correction coefficient K for the Y component YY and the standard value of the Y component, Y Y0 Specifically, the control unit 29 corrects the standard value Y Y0 and the wavelength shift correction coefficient K for the Y component YY and the measured value Tm of the second measurement Y By substituting the above into the following equation (22), the reference value Y of the Y component for the second light source 22 is obtained. Y1 Calculate.

[0097] Furthermore, the control unit 29 determines the standard value Z of the Z component among the control parameters related to the second light source 22. Y0 and the wavelength shift correction coefficient K for the Z component YZ Then, the control unit 29 reads out the second measurement value Tm Y and the wavelength shift correction coefficient K for the Z component YZ and the standard value of the Z component Z Y0 Specifically, the control unit 29 corrects the standard value Z of the Z component. Y0 and the wavelength shift correction coefficient K for the Z component YZ and the measured value Tm of the second measurement Y By substituting the above into the following equation (23), the reference value Z of the Z component for the second light source 22 is obtained. Y1 Calculate.

[0098]

number

[0099] Subsequently, the control unit 29 executes a color matching process (step S15). Specifically, the control unit 29 adjusts the first power setting value Po B and the second power setting value Po Y The target X component value is expressed by the following equation (24): The target Y component value is expressed by the following equation (25): The target Z component value is expressed by the following equation (26):

[0100]

number

[0101] When the above equations (24), (25), and (26) are converted into determinants, the following equation (27) is obtained. The control unit 29 solves the simultaneous equations based on the following equation (27) to obtain the first power setting value Po B and the second power setting value Po Y and calculate.

[0102]

number

[0103] Next, the control unit 29 executes constant output processing for the first light source 21 (step S16). Specifically, the control unit 29 executes constant output processing for the first light source 21 by adjusting the constant output coefficient k B00 ~k Bij Then, the control unit 29 reads out the constant output coefficient k B00 ~k Bij and the measured value Tm of the first measurement B and the first power setting value Po B Based on this, the first drive current setting value If B Specifically, the control unit 29 calculates the constant output coefficient k B00 ~k Bij and the measured value Tm of the first measurementB and the first power setting value Po B By substituting into the above equation (18), the first drive current setting value If B Calculate.

[0104] Subsequently, the control unit 29 executes a constant output process for the second light source 22 (step S17). Specifically, the control unit 29 performs a constant output process for the second light source 22 by adjusting the constant output coefficient k Y00 ~k Yij Then, the control unit 29 reads out the constant output coefficient k Y00 ~k Yij and the measured value Tm of the second measurement Y and the second power setting value Po Y Based on this, the second drive current setting value If Y Specifically, the control unit 29 calculates the constant output coefficient k Y00 ~k Yij and the measured value Tm of the second measurement Y and the second power setting value Po Y By substituting into the following equation (28), the setting value of the second drive current If Y Calculate.

[0105]

number

[0106] Next, the control unit 29 controls the drive current supplied to each light source (step S18). Specifically, the control unit 29 controls the value of the first drive current supplied from the first light source driver 25 to the first light source 21 to be equal to or greater than the set value If B Furthermore, the control unit 29 controls the first light source driver 25 so that the value of the second drive current supplied from the second light source driver 26 to the second light source 22 is equal to or greater than the set value If Y The second light source driver 26 is controlled so that:

[0107] After completing the process of step S18, the control unit 29 returns to step S12 and repeatedly executes the processes from step S12 to step S18 at a predetermined cycle.

[0108] (Effects of the second embodiment) As described above, the light source device 20 of the second embodiment includes a first light source 21 that emits a first light BL1, a second light source 22 that emits a second light BL2, a first sensor 27 that detects a first measurement value corresponding to the temperature of the first light source 21, a second sensor 28 that detects a second measurement value corresponding to the temperature of the second light source 22, and a control unit 29. The control unit 29 controls the output of the first light source 21 based on the first measurement value, and controls the output of the second light source 22 based on the second measurement value. According to the light source device 20 described above, the outputs of the first light source 21 and the second light source 22 are controlled using two sensors that are less expensive than light intensity sensors used in conventional technology, thereby reducing component costs. Furthermore, the outputs of the first light source 21 and the second light source 22 are individually controlled based on the temperatures of the first light source 21 and the second light source 22, respectively, so the white light WL emitted from the light source device 20 can be controlled with high precision.

[0109] In the light source device 20 of the second embodiment, the control unit 29 controls the output of the first light source 21 by controlling the first drive current supplied to the first light source 21 based on the first measurement value. The control unit 29 also controls the output of the second light source 22 by controlling the second drive current supplied to the second light source 22 based on the second measurement value. According to the light source device 20 described above, the output of the first light source 21 can be easily controlled by controlling the first drive current based on the first measurement value. Also, the output of the second light source 22 can be easily controlled by controlling the second drive current based on the second measurement value.

[0110] In the light source device 20 of the second embodiment, the control unit 29 controls a target value (Yxy) expressed in the XYZ color system and a first standard value (X) expressed in the XYZ color system and set in advance corresponding to the first light source 21. B0 , Y B0, Z B0 ) and a second standard value (X Y0 , Y Y0 , Z Y0 ) based on which the first power setting value Po B and the second power setting value Po Y The control unit 29 calculates the first coefficient (k B00 ~k Bij ) and the first power setting Po B Based on this, the first drive current setting value If B The control unit 29 calculates the second coefficient (k Y00 ~k Yij ) and the second power setting Po Y Based on this, the second drive current setting value If Y Calculate. According to the light source device 20 as described above, it is possible to accurately calculate the set value of each drive current that can achieve the target value in accordance with the temperature change of each light source.

[0111] In the light source device 20 of the second embodiment, the control unit 29 controls the first power setting value Po B and the second power setting value Po Y Before calculating the above, the first standard value is corrected based on the first measurement value and a first correction coefficient that is preset corresponding to the first light source 21, and the second standard value is corrected based on the second measurement value and a second correction coefficient that is preset corresponding to the second light source 22. According to the light source device 20 described above, even if a wavelength shift occurs due to a temperature change in each light source, the first standard value and the second standard value are temperature-corrected, so that the setting value of each drive current can be accurately calculated in accordance with the temperature change of each light source.

[0112] [Third embodiment of light source device] 6 is a block diagram schematically illustrating the configuration of a light source device 30 according to the third embodiment. As shown in FIG. 6, the light source device 30 includes a first light source 31, a beam splitter 32, a phosphor 33, a light combining unit 34, a first light source driver 35, a first sensor 36, and a control unit 37.

[0113] The first light source 31 emits a first light BL. As an example, the first light source 31 emits blue light as the first light BL. For example, the first light source 31 may include one or more blue laser diodes to emit blue light as the first light BL. A first drive current is supplied to the first light source 31 from a first light source driver 35. The output of the first light source 31 is controlled by the first drive current.

[0114] The beam splitter 32 emits the first light BL to the phosphor 33 and the light combining unit 34. The phosphor 33 converts the first light BL incident from the beam splitter 32 into fourth light YL, which is yellow light. The light combining unit 34 combines the blue first light BL incident from the beam splitter 32 with the yellow fourth light YL incident from the phosphor 33. The light combining unit 34 emits white light WL obtained by combining the first light BL and the fourth light YL. In other words, the light source device 30 emits white light WL.

[0115] The first light source driver 35 supplies a first drive current to the first light source 31 based on a first control signal output from the control unit 37. The value of the first drive current supplied from the first light source driver 35 to the first light source 31 is controlled by the control unit 37.

[0116] The first sensor 36 detects a first measurement value corresponding to the temperature of the first light source 31. The first sensor 36 outputs an electrical signal indicating the first measurement value to the control unit 37. For example, the first sensor 36 is a thermistor.

[0117] The control unit 37 controls the output of the first light source 31. As will be described in detail later, the control unit 37 controls the output of the first light source 31 based on a first measurement value detected by the first sensor 36. More specifically, the control unit 37 controls the output of the first light source 31 by controlling a first drive current supplied to the first light source 31 based on the first measurement value.

[0118] For example, similar to the control unit 15 of the first embodiment, the control unit 37 includes one or more processors and one or more memories, and the non-volatile memory of the control unit 37 stores in advance control parameters required to control the first light source 31. The method of acquiring the control parameters is the same as in the first embodiment, and therefore will not be described repeatedly in the third embodiment.

[0119] The control parameters required for controlling the first light source 31 are the constant output coefficient k B00 ~k Bij and the standard value of the X component, X B0 and the standard value of the Y component, Y B0 and the standard value of the Z component, Z B0 and the wavelength shift correction coefficient K for the X component BX and the wavelength shift correction coefficient K for the Y component BY and the wavelength shift correction coefficient K for the Z component BZ and are stored in the memory.

[0120] The light source control process executed by the control unit 37 will be described below with reference to Fig. 7. Fig. 7 is a flowchart showing the light source control process executed by the control unit 37.

[0121] 7, first, the control unit 37 sets a target value for the Y component and target values ​​for the color coordinates x and y (step S21). The target value for the Y component and the target values ​​for the color coordinates x and y are examples of target values ​​expressed in the first color system.

[0122] Next, the control unit 37 measures a value that changes depending on the temperature of the first light source 31 (step S22). Specifically, the control unit 37 calculates the measured value Tm of the first measurement value corresponding to the temperature of the first light source 31 based on the output signal of the first sensor 36. B Get.

[0123] Next, the control unit 37 executes constant output processing for the first light source 31 (step S23). Specifically, the control unit 37 executes constant output processing for the first light source 31 by adjusting the constant output coefficient k B00 ~k Bij Then, the control unit 37 reads out the constant output coefficient k B00 ~k Bij and the measured value Tm of the first measurement B and the first power setting value Po B Based on this, the first drive current setting value If B Specifically, the control unit 37 calculates the constant output coefficient k B00 ~k Bij and the measured value Tm of the first measurement B and the first power setting value Po B By substituting into the above equation (18), the first drive current setting value If B In the case where there is one light source as in the third embodiment, the first power setting value Po B is a fixed value.

[0124] Next, the control unit 37 controls the first drive current supplied to the first light source 31 (step S24). Specifically, the control unit 37 controls the first drive current supplied from the first light source driver 36 to the first light source 31 to be equal to or greater than the set value If B The first light source driver 36 is controlled so that:

[0125] After completing the process of step S24, the control unit 37 returns to step S22 and repeatedly executes the processes from step S22 to step S24 at a predetermined cycle.

[0126] (Effects of the third embodiment) As described above, the light source device 30 of the third embodiment includes a first light source 31 that emits a first light BL, a first sensor 36 that detects a first measurement value corresponding to the temperature of the first light source 31, and a control unit 37 that controls the output of the first light source 31 based on the first measurement value. According to the light source device 30 described above, the output of the first light source 31 is controlled using one sensor that is less expensive than the two light intensity sensors used in the prior art, thereby reducing the number of parts and the cost of parts. Furthermore, since the output of the first light source 21 is controlled individually based on the temperature of the first light source 21, the white light WL emitted from the light source device 30 can be controlled with high precision.

[0127] In the light source device 30 of the third embodiment, the control unit 37 controls the output of the first light source 31 by controlling the first drive current supplied to the first light source 31 based on the first measurement value. According to the light source device 30 as described above, the output of the first light source 31 can be easily controlled by controlling the first drive current based on the first measurement value.

[0128] In the light source device 30 of the third embodiment, the control unit 37 calculates the first measurement value and a first coefficient (k B00 ~k Bij ) and the first power setting Po B Based on this, the first drive current setting value If B Calculate. According to the light source device 30 as described above, the set value If of the first driving current that can achieve the target value in response to the temperature change of the first light source 31 is B Furthermore, according to the light source device 30 described above, the wavelength shift correction process and color matching process described in the first and second embodiments can be omitted, thereby reducing the calculation load on the control unit 37.

[0129] [projector] FIG. 8 is a diagram schematically showing the configuration of a projector 100 in this embodiment. As shown in Fig. 8, the projector 100 is a projection-type image display device that displays an image on a screen SCR. The projector 100 includes the light source device 10 of the first embodiment, a color separation optical system 3, a light modulation element 4R, a light modulation element 4G, a light modulation element 4B, a combining optical system 5, and a projection optical system 6. Note that the projector 100 may include the light source device 20 of the second embodiment or the light source device 30 of the third embodiment instead of the light source device 10 of the first embodiment.

[0130] The light source device 10 emits white light WL toward the color separation optical system 3. The color separation optical system 3 separates the white light WL emitted from the light source device 10 into red light LR, green light LG, and blue light LB. The color separation optical system 3 includes a first dichroic mirror 7a, a second dichroic mirror 7b, a first total reflection mirror 8a, a second total reflection mirror 8b, a third total reflection mirror 8c, a first relay lens 9a, and a second relay lens 9b.

[0131] The first dichroic mirror 7a separates the white light WL from the light source device 10 into red light LR and light containing green light LG and blue light LB. The first dichroic mirror 7a transmits the red light LR and reflects the light containing green light LG and blue light LB. On the other hand, the second dichroic mirror 7b reflects the green light LG and transmits the blue light LB. In this way, the second dichroic mirror 7b separates the light incident from the first dichroic mirror 7a into green light LG and blue light LB.

[0132] The first total reflection mirror 8a is disposed in the optical path of the red light LR and reflects the red light LR that has passed through the first dichroic mirror 7a toward the light modulation element 4R. On the other hand, the second total reflection mirror 8b and the third total reflection mirror 8c are disposed in the optical path of the blue light LB and guide the blue light LB that has passed through the second dichroic mirror 7b toward the light modulation element 4B. The green light LG is reflected from the second dichroic mirror 7b toward the light modulation element 4G.

[0133] The first relay lens 9a and the second relay lens 9b are disposed on the light exit side of the second total reflection mirror 8b in the optical path of the blue light LB. The first relay lens 9a and the second relay lens 9b compensate for the optical loss of the blue light LB caused by the optical path length of the blue light LB being longer than the optical path lengths of the red light LR and the green light LG.

[0134] The light modulation element 4R modulates the red light LR according to image information to form image light corresponding to the red light LR. The light modulation element 4G modulates the green light LG according to image information to form image light corresponding to the green light LG. The light modulation element 4B modulates the blue light LB according to image information to form image light corresponding to the blue light LB.

[0135] For example, a transmissive liquid crystal panel is used for each of the light modulation elements 4R, 4G, and 4B. Polarizing plates (not shown) are arranged on the incident side and the exit side of each liquid crystal panel.

[0136] A field lens 2R is disposed on the incident side of the light modulation element 4R. The field lens 2R collimates the red light LR incident on the light modulation element 4R. A field lens 2G is disposed on the incident side of the light modulation element 4G. The field lens 2G collimates the green light LG incident on the light modulation element 4G. A field lens 2B is disposed on the incident side of the light modulation element 4B. The field lens 2B collimates the blue light LB incident on the light modulation element 4B.

[0137] The image light emitted from the light modulation element 4R, the light modulation element 4G, and the light modulation element 4B is incident on the combining optical system 5. The combining optical system 5 combines the image light corresponding to the red light LR, the green light LG, and the blue light LB, respectively, and emits the combined image light toward the projection optical system 6. The combining optical system 5 uses, for example, a cross dichroic prism.

[0138] The projection optical system 6 has a plurality of projection lenses. The projection optical system 6 enlarges and projects the image light combined by the combining optical system 5 onto the screen SCR. As a result, an enlarged image is displayed on the screen SCR.

[0139] The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure. For example, in the above embodiment, the projector 100 including the optical device 10 is exemplified, but the light source device of the present disclosure can be widely applied as a light source device for electronic devices other than the projector 100.

[0140] Summary of the Disclosure A summary of this disclosure is provided below.

[0141] (Supplementary Note 1) A light source device comprising: a first light source that emits first light; a first sensor that detects a first measurement value corresponding to the temperature of the first light source; and a control unit that controls the output of the first light source based on the first measurement value.

[0142] According to the light source device described in Supplementary Note 1, the output of the first light source is controlled using one sensor that is less expensive than the two light intensity sensors used in the prior art, thereby reducing the number of components and component costs. Furthermore, the output of the first light source is individually controlled based on the temperature of the first light source, allowing for accurate control of the light emitted from the light source device.

[0143] (Supplementary Note 2) The light source device described in Supplementary Note 1, wherein the control unit controls the output of the first light source by controlling a first drive current supplied to the first light source based on the first measurement value.

[0144] According to the light source device described in Supplementary Note 2, the output of the first light source can be easily controlled by controlling the first drive current based on the first measurement value.

[0145] (Appendix 3) The light source device described in Appendix 2, wherein the control unit calculates the setting value of the first driving current based on the first measurement value, a first coefficient preset corresponding to the first light source, and a first power setting value of the first light source.

[0146] According to the light source device described in Supplementary Note 3, it is possible to accurately calculate the set value of the first drive current that can achieve the target value in accordance with the temperature change of the first light source.

[0147] (Appendix 4) The light source device described in Appendix 1 further includes a second light source that emits second light and a second sensor that detects a second measurement value corresponding to the temperature of the second light source, and the control unit controls the output of the second light source based on the second measurement value.

[0148] According to the light source device described in Supplementary Note 4, the outputs of the first light source and the second light source are controlled using two sensors that are less expensive than the light intensity sensors used in conventional technology, thereby reducing component costs. Furthermore, the outputs of the first light source and the second light source are controlled individually based on the temperatures of the first light source and the second light source, respectively, allowing for accurate control of the light emitted from the light source device.

[0149] (Appendix 5) The light source device described in Appendix 4, wherein the control unit controls the output of the first light source by controlling a first drive current supplied to the first light source based on the first measurement value, and controls the output of the second light source by controlling a second drive current supplied to the second light source based on the second measurement value.

[0150] According to the light source device described in Supplementary Note 5, the output of the first light source can be easily controlled by controlling the first drive current based on the first measurement value, and the output of the second light source can be easily controlled by controlling the second drive current based on the second measurement value.

[0151] (Supplementary Note 6) The control unit calculates a first power setting value of the first light source and a second power setting value of the second light source based on a target value expressed in a first color system, a first standard value expressed in the first color system and preset corresponding to the first light source, and a second standard value expressed in the first color system and preset corresponding to the second light source; calculates the setting value of the first drive current based on the first measured value, a first coefficient preset corresponding to the first light source, and the first power setting value; and calculates the setting value of the second drive current based on the second measured value, a second coefficient preset corresponding to the second light source, and the second power setting value.

[0152] According to the light source device described in Supplementary Note 6, it is possible to accurately calculate the set value of each drive current that can achieve the target value in accordance with the temperature change of each light source.

[0153] (Appendix 7) The light source device described in Appendix 6, wherein, before calculating the first power setting value and the second power setting value, the control unit corrects the first standard value based on the first measurement value and a first correction coefficient that is preset corresponding to the first light source, and corrects the second standard value based on the second measurement value and a second correction coefficient that is preset corresponding to the second light source.

[0154] According to the light source device described in Appendix 7, even if a wavelength shift occurs due to a temperature change in each light source, the first standard value and the second standard value are temperature-corrected, so that the setting value of each drive current can be accurately calculated in accordance with the temperature change of each light source.

[0155] (Appendix 8) The light source device described in Appendix 4 further includes a third light source that emits third light and a third sensor that detects a third measurement value corresponding to the temperature of the third light source, and the control unit controls the output of the third light source based on the third measurement value.

[0156] According to the light source device described in Supplementary Note 8, the outputs of the first light source, the second light source, and the third light source are controlled using three sensors that are less expensive than the light intensity sensors used in conventional technology, thereby reducing component costs. Furthermore, the outputs of the first light source, the second light source, and the third light source are individually controlled based on the temperatures of the first light source, the second light source, and the third light source, respectively, thereby enabling precise control of the light emitted from the light source device.

[0157] (Appendix 9) The light source device described in Appendix 8, wherein the control unit controls the output of the first light source by controlling a first drive current supplied to the first light source based on the first measurement value, controls the output of the second light source by controlling a second drive current supplied to the second light source based on the second measurement value, and controls the output of the third light source by controlling a third drive current supplied to the third light source based on the third measurement value.

[0158] According to the light source device described in Supplementary Note 9, the output of the first light source can be easily controlled by controlling the first drive current based on the first measurement value. Also, the output of the second light source can be easily controlled by controlling the second drive current based on the second measurement value. Furthermore, the output of the third light source can be easily controlled by controlling the third drive current based on the third measurement value.

[0159] (Supplementary Note 10) The light source device described in Supplementary Note 9, wherein the control unit calculates a first power setting value of the first light source, a second power setting value of the second light source, and a third power setting value of the third light source based on a target value expressed in a first color system, a first standard value expressed in the first color system and preset for the first light source, a second standard value expressed in the first color system and preset for the second light source, and a third standard value expressed in the first color system and preset for the third light source; calculates the setting value of the first driving current based on the first measured value, a first coefficient preset for the first light source, and the first power setting value; calculates the setting value of the second driving current based on the second measured value, a second coefficient preset for the second light source, and the second power setting value; and calculates the setting value of the third driving current based on the third measured value, a third coefficient preset for the third light source, and the third power setting value.

[0160] According to the light source device described in Supplementary Note 10, it is possible to accurately calculate the set value of each drive current that can achieve the target value in accordance with the temperature change of each light source.

[0161] (Appendix 11) The light source device described in Appendix 10, wherein, before calculating the first power setting value, the second power setting value, and the third power setting value, the control unit corrects the first standard value based on the first measurement value and a first correction coefficient that is preset corresponding to the first light source, corrects the second standard value based on the second measurement value and a second correction coefficient that is preset corresponding to the second light source, and corrects the third standard value based on the third measurement value and a third correction coefficient that is preset corresponding to the third light source.

[0162] According to the light source device described in Appendix 11, even if a wavelength shift occurs due to a temperature change in each light source, the first standard value, the second standard value, and the third standard value are temperature-corrected, so that the setting value of each drive current can be accurately calculated in accordance with the temperature change of each light source.

[0163] (Appendix 12) A projector comprising: a light source device according to any one of Appendices 1 to 11; a light modulation element that modulates light emitted from the light source device; and a projection optical system that projects the light modulated by the light modulation element.

[0164] According to the projector described in Supplementary Note 12, since the projector is provided with a light source device that can reduce the number of parts and the part costs, the number of parts and the part costs of the projector itself can be reduced. [Explanation of symbols]

[0165] 10, 20, 30...light source device, 11B, 21, 31...first light source, 11G, 22...second light source, 11R...third light source, 12, 24, 34...light combining unit, 13B, 25, 35...first light source driver, 13G, 26...second light source driver, 13R...third light source driver, 14B, 27, 36...first sensor, 14G, 28...second sensor, 14R...third sensor, 23, 33...phosphor, 32...beam splitter, 15, 29, 37...control unit, 100...projector

Claims

1. a first light source that emits a first light; a first sensor for detecting a first measurement corresponding to a temperature of the first light source; a control unit that controls an output of the first light source based on the first measurement value; A light source device comprising:

2. The light source device according to claim 1 , wherein the control unit controls an output of the first light source by controlling a first drive current supplied to the first light source based on the first measurement value.

3. 3. The light source device according to claim 2, wherein the control unit calculates the setting value of the first driving current based on the first measurement value, a first coefficient preset corresponding to the first light source, and a first power setting value of the first light source.

4. a second light source that emits second light; a second sensor for detecting a second measurement corresponding to a temperature of the second light source; Furthermore, The light source device according to claim 1 , wherein the control unit controls an output of the second light source based on the second measurement value.

5. The control unit controlling an output of the first light source by controlling a first drive current supplied to the first light source based on the first measurement value; controlling an output of the second light source by controlling a second drive current supplied to the second light source based on the second measurement value; The light source device according to claim 4 .

6. The control unit calculating a first power setting value of the first light source and a second power setting value of the second light source based on a target value expressed in a first color system, a first standard value expressed in the first color system and preset corresponding to the first light source, and a second standard value expressed in the first color system and preset corresponding to the second light source; calculating a setting value of the first drive current based on the first measurement value, a first coefficient preset corresponding to the first light source, and the first power setting value; calculating a set value of the second driving current based on the second measurement value, a second coefficient preset corresponding to the second light source, and the second power set value; The light source device according to claim 5 .

7. Before calculating the first power setting value and the second power setting value, the control unit correcting the first standard value based on the first measurement value and a first correction coefficient that is preset corresponding to the first light source; correcting the second standard value based on the second measurement value and a second correction coefficient that is preset corresponding to the second light source; The light source device according to claim 6 .

8. a third light source that emits third light; a third sensor for detecting a third measurement corresponding to a temperature of the third light source; Furthermore, The light source device according to claim 4 , wherein the control unit controls an output of the third light source based on the third measurement value.

9. The control unit controlling an output of the first light source by controlling a first drive current supplied to the first light source based on the first measurement value; controlling an output of the second light source by controlling a second drive current supplied to the second light source based on the second measurement value; controlling an output of the third light source by controlling a third drive current supplied to the third light source based on the third measurement value; The light source device according to claim 8 .

10. The control unit calculating a first power setting value of the first light source, a second power setting value of the second light source, and a third power setting value of the third light source based on a target value expressed in a first color system, a first standard value expressed in the first color system and preset corresponding to the first light source, a second standard value expressed in the first color system and preset corresponding to the second light source, and a third standard value expressed in the first color system and preset corresponding to the third light source; calculating a setting value of the first drive current based on the first measurement value, a first coefficient preset corresponding to the first light source, and the first power setting value; calculating a setting value of the second driving current based on the second measurement value, a second coefficient preset corresponding to the second light source, and the second power setting value; calculating a set value of the third driving current based on the third measurement value, a third coefficient preset corresponding to the third light source, and the third power set value; The light source device according to claim 9 .

11. Before calculating the first power setting value, the second power setting value, and the third power setting value, the control unit correcting the first standard value based on the first measurement value and a first correction coefficient that is preset corresponding to the first light source; correcting the second standard value based on the second measurement value and a second correction coefficient that is preset in correspondence with the second light source; correcting the third standard value based on the third measurement value and a third correction coefficient that is preset corresponding to the third light source; The light source device according to claim 10.

12. The light source device according to any one of claims 1 to 11; a light modulation element that modulates the light emitted from the light source device; a projection optical system that projects the light modulated by the light modulation element; A projector equipped with

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