WO2012017511A1 - 投写型表示装置および光源冷却方法 - Google Patents
投写型表示装置および光源冷却方法 Download PDFInfo
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- WO2012017511A1 WO2012017511A1 PCT/JP2010/063022 JP2010063022W WO2012017511A1 WO 2012017511 A1 WO2012017511 A1 WO 2012017511A1 JP 2010063022 W JP2010063022 W JP 2010063022W WO 2012017511 A1 WO2012017511 A1 WO 2012017511A1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
Definitions
- the present invention relates to a projection display device using an LED (Light Emitting Diode) as a light source and a light source cooling method thereof.
- LED Light Emitting Diode
- a high-pressure mercury lamp has been often used as a light source in the past.
- an LED that has been used instead of a high-pressure mercury lamp has attracted attention.
- LED has the advantage that brightness can be adjusted quickly compared to high-pressure mercury lamps. For this reason, in a projection display device using an LED as a light source, the brightness of the projected image can be adjusted according to the ambient brightness by adjusting the brightness of the LED according to the ambient brightness. . In this case, since it is possible to suppress the LED from being lit at a brightness higher than necessary, the power consumption of the projection display device can be reduced.
- the power conversion efficiency (WPE: Wall Plug Efficiency), which is the ratio of the optical output power to the input power, is as low as 5% to 15%, and much of the input power is converted into heat, and the junction temperature of the LED Tj will rise.
- WPE Wall Plug Efficiency
- a projection display device using an LED as a light source usually has a preset LED junction temperature Tj.
- the LED is cooled so as not to exceed the junction temperature Tj (max).
- a device that can adjust the cooling power according to the input power such as a Peltier element, is often used (see Patent Document 1).
- FIG. 1 is a block diagram showing a configuration of a projection display device that has LED cooling means and changes the brightness of the LED according to the ambient brightness.
- a projection display apparatus 200 includes light source units 204R, 204G, and 204B that emit red light, green light, and blue light, and cooling units 205R, 205G that cool the light source units 204R, 204G, and 204B, respectively.
- 205B and an adjustment unit 201 that adjusts the input power of each light source unit 204R, 204G, and 204B and the input power of each cooling unit 205R, 205G, and 205B.
- Each light source unit 204R, 204G, and 204B includes an LED and an LED case that houses the LED. Moreover, each cooling part 205R, 205G, and 205B is comprised by the Peltier device.
- the adjustment unit 201 adjusts the brightness of each LED by adjusting the light source input power W, which is the input power of each LED, according to the detection result of the optical sensor 202 that detects ambient brightness.
- the adjusting unit 201 detects each of the cooling units 205R, 205G, and 205B according to the detection results of the light source case temperature detection units 210R, 210G, and 210B that detect the case temperature Tc of the LED case of each of the light source units 204R, 204G, and 204B.
- the cooling input power that is the input power of is adjusted.
- Tj If ⁇ Vf ⁇ (1 ⁇ WPE / 100) ⁇ Rj ⁇ c + Tc” holds between the LED junction temperature Tj and the LED case temperature Tc. Yes.
- Vf the forward voltage of the LED
- WPE the power conversion efficiency of the LED
- Rj ⁇ c the thermal resistance between the LED junction and the LED case.
- the product If ⁇ Vf of the forward current If and the forward voltage Vf is the light source input power W of the LED.
- the power conversion efficiency WPE and the thermal resistance Rj-c can be generally regarded as constants determined for each LED.
- the maximum case temperature that is the case temperature Tc when the junction temperature Tj becomes the maximum junction temperature Tj (max) is uniquely determined.
- the cooling input power is adjusted so that the case temperature Tc becomes the maximum case temperature, the junction temperature Tj can be prevented from exceeding the maximum junction temperature Tj (max).
- the adjustment unit 201 sets the maximum when the light source input power W is the upper limit value. The cooling input power is adjusted so that the case temperature is equal to the case temperature Tc.
- the light source input power W since the light source input power W is adjusted according to the ambient brightness, the light source input power W may be lower than the upper limit value.
- the maximum junction temperature at this time is lower than the maximum junction temperature when the light source input power W is the upper limit value. Therefore, by reducing the cooling input power, the junction temperature Tj can be prevented from exceeding the maximum junction temperature Tj (max) even if the cooling power of the Peltier element is reduced.
- the cooling input power is adjusted so that the case temperature Tc is always the maximum case temperature when the light source input power W is the upper limit value. More than that.
- An object of the present invention is to provide a projection display device and a light source cooling method capable of solving the above-described problem that when the light source input power is adjusted, the power required for cooling the LEDs becomes larger than necessary. Is to provide.
- a projection display device is a projection display device that projects light from an LED to display an image, a cooling unit that cools the LED, a light detection unit that detects ambient brightness, A voltage detection unit that detects a forward voltage of the LED; a current detection unit that detects a forward current of the LED; a temperature detection unit that detects a case temperature that is a temperature of the LED case; and the ambient brightness And a control unit that adjusts the brightness of the LED based on the brightness and adjusts the cooling power of the cooling unit based on the forward voltage, the forward current, and the case temperature.
- the light source cooling method is an LED cooling method for a projection display device that projects light from an LED to display an image, detects ambient brightness, and detects a forward voltage of the LED. Detecting a forward current of the LED, detecting a case temperature which is a temperature of the LED case, adjusting the brightness of the LED based on the ambient brightness, and detecting the forward voltage and the forward voltage.
- the LED is cooled with a cooling power corresponding to the direction current and the case temperature.
- the power required for cooling the LED can be set to an appropriate value.
- FIG. 2 is a block diagram showing a configuration of a projection display apparatus according to an embodiment of the present invention.
- a projection display apparatus 100 includes an image signal processing unit 101, a spatial light modulation signal generation unit 102, light source units 103R, 103G and 103B, spatial light modulation elements 104R, 104G and 104B, and a cross dichroic prism.
- the image signal is input to the image signal processing unit 101.
- the image signal processing unit 101 performs various image signal processing such as resolution conversion on the input image signal.
- the spatial light modulation signal generation unit 102 generates a spatial light modulation signal for spatially modulating light according to the input image signal subjected to the image signal processing by the image signal processing unit 101, and performs the spatial light modulation The signal is output to each of the spatial light modulation elements 104R, 104G, and 104B.
- Each light source part 103R, 103G, and 103B is comprised with LED301 and LED case 302 which accommodates the LED, as shown in FIG.
- Each light source unit 103R, 103G, and 103B emits light of a light amount corresponding to the light source input power from each light source driving unit 109R, 109G, and 109B. Further, the light emitted from each of the light source units 103R, 103G, and 103B has a different wavelength.
- the light source unit 103R emits red light that is light in the red wavelength band
- the light source unit 103G emits green light that is light in the green wavelength band
- the light source unit 103B is in the blue wavelength band. It is assumed that blue light that is the light of the above is emitted.
- the LED used in the light source unit 103R is referred to as a red LED
- the LED used in the light source unit 103G is referred to as a green LED
- a blue LED used in the light source unit 103B is referred to as a red LED
- the LED used in the light source unit 103G is referred to as a green LED
- Each of the spatial light modulation elements 104R, 104G, and 104B spatially modulates and emits each color light from each of the light source units 103R, 103G, and 103B according to the spatial light modulation signal from the spatial light modulation signal generation unit 102. .
- the cross dichroic prism 105 synthesizes and emits the respective color lights from the spatial light modulation elements 104R, 104G, and 104B.
- the projection lens 106 projects the combined light from the cross dichroic prism 105 onto a screen (not shown) and displays an image on the screen.
- Each of the cooling units 107R, 107G, and 107B is composed of a Peltier element.
- Each cooling unit 107R, 107G, and 107B cools each light source unit 103R, 103G, and 103B with a cooling power corresponding to the cooling power supplied from each cooling drive unit 108R, 108G, and 108B.
- Each cooling drive unit 108R, 108G, and 108B inputs the cooling input power indicated by the cooling control signal from the adjustment unit 117 to each cooling unit 107R, 107G, and 107B, and each light source unit by each cooling unit 107R, 107G, and 107B.
- the cooling power of 103R, 103G and 103B is adjusted.
- the light source driving units 109R, 109G, and 109B turn on the light source units 103R, 103G, and 103B with the brightness indicated by the light source control signal from the adjustment unit 117.
- the light source driving units 109R, 109G, and 109B turn on the light source units 103R, 103G, and 103B by applying pulse power to the light source units 103R, 103G, and 103B as light source input power.
- the brightness of each light source unit 103R, 103G, and 103B changes according to the duty ratio of the pulse power. Therefore, the light source control signal indicates the duty ratio, and each light source drive unit 109R, 109G, and 109B inputs the pulse power of the duty ratio indicated by the light source control signal to each light source unit 103R, 103G, and 103B.
- the optical sensor driving unit 110 inputs sensor power to the optical sensor 111.
- the photosensor 111 is a photodetection unit that is driven by the sensor power from the photosensor drive unit 110 and detects the brightness of the surroundings (outside of the projection display device 100).
- Each light source case temperature detection unit 112R, 112G, and 112B detects a case temperature Tc that is the temperature of the LED case 302 of each light source unit 103R, 103G, and 103B.
- Each light source forward voltage detector 113R, 113G and 113B detects the forward voltage Vf of the LED 301 of each light source 103R, 103G and 103B.
- Each light source forward current detection unit 114R, 114G, and 114B detects the forward current If of the LED 301 of each light source unit 103R, 103G, and 103B.
- the storage unit 115, the ON / Duty calculation unit 116, and the adjustment unit 117 constitute a control unit.
- the control unit obtains the duty ratio of the pulse power input to each of the light source units 103R, 103G, and 103B according to the ambient brightness detected by the optical sensor 111, and supplies a light source control signal indicating the duty ratio to each light source.
- the brightness is output to the units 103R, 103G, and 103B to adjust the brightness of the light source units 103R, 103G, and 103B.
- control unit includes a case temperature Tc detected by each light source case temperature detection unit 112R, 112G, and 112B, a forward voltage Vf detected by each light source forward voltage detection unit 113R, 113G, and 113B, Based on the forward current If detected by each of the light source forward current detectors 114R, 114G, and 114B, the cooling input power to be supplied to each of the cooling units 107R, 107G, and 107 is determined. And a control part outputs the cooling control signal which shows the cooling input electric power to each cooling drive part 108R, 108G, and 108B, and adjusts the cooling power of each cooling part 107R, 107G, and 107.
- the storage unit 115 stores characteristic information indicating the characteristics of the LEDs 301 used in the light source units 103R, 103G, and 103B.
- the characteristic information indicates the maximum junction temperature Tj (max), the power conversion efficiency WPE, and the thermal resistance Rj-c between the LED junction and the LED case as the LED characteristics.
- the ON / Duty calculation unit 116 joins the LED for each LED.
- the ratio of the difference between the maximum junction temperature Tj of the LED and the case temperature Tc with respect to the difference between the temperature Tj and the case temperature Tc is calculated as “ON / Duty” of the LED.
- the adjusting unit 117 outputs a light source control signal indicating a duty ratio according to ambient brightness to each of the light source units 103R, 103G, and 103B, and adjusts the brightness of each of the light source units 103R, 103G, and 103B.
- the adjusting unit 117 outputs a cooling control signal indicating cooling input power corresponding to “ON / Duty” calculated by the ON / Duty calculating unit 116 to each cooling driving unit 108R, 108G, and 108B.
- the cooling power of the cooling units 107R, 107G and 107 is adjusted.
- the adjustment unit 117 sets the cooling input power indicated by the cooling control signal to a predetermined value, and then “ON / Duty” is determined according to the brightness of the LED. If it is larger than the upper limit value of the allowable range, the cooling input power is decreased, and if “ON ⁇ Duty” is smaller than the lower limit value of the allowable range, the cooling input power is increased. Thereby, the adjustment unit 117 reduces the cooling power of each of the cooling units 107R, 107G, and 107 when “ON / Duty” is larger than the upper limit value of the allowable range, and “ON / Duty” is smaller than the lower limit value of the allowable range. In this case, the cooling power of each of the cooling units 107R, 107G, and 107 is increased.
- FIG. 4 to 6 are flowcharts for explaining operations related to the light source control processing of the projection display apparatus 100.
- FIG. since the same operation
- the adjustment unit 117 outputs a cooling control signal indicating a predetermined cooling input power, and causes the cooling drive unit 108R to start the operation of the cooling unit 107R (step S101). ).
- the adjustment unit 117 reads out the characteristic information (maximum junction temperature Tj (max), power conversion efficiency WPE, and thermal resistance Rj-c) of the light source unit 103R from the storage unit 115 (step S102).
- the adjustment unit 117 outputs a drive signal to the optical sensor driving unit 110 to cause the optical sensor driving unit 110 to drive the optical sensor 111.
- the optical sensor 111 detects ambient brightness and outputs the detection result L to the adjustment unit 117 (step S103).
- the adjustment unit 117 determines whether or not the detection result L is equal to or greater than a predetermined first threshold (hereinafter referred to as “100” for convenience) (step S104).
- a predetermined first threshold hereinafter referred to as “100” for convenience
- the light source case temperature detecting unit 112R detects the case temperature Tc of the light source unit 103R and outputs it to the adjusting unit 117, and the light source forward voltage detecting unit 113R is the forward direction of the light source unit 103R.
- the voltage Vf is detected and output to the adjustment unit 117, and the light source forward current detection unit 114R detects and outputs the forward current If of the light source unit 103R (step S106).
- adjustment unit 117 Upon receiving case temperature Tc, forward voltage Vf, and forward current If, adjustment unit 117 turns on the received case temperature Tc, forward voltage Vf, forward current If, and the characteristic information read in step S102. Output to the duty calculation unit 116.
- ON / Duty calculation unit 116 receives characteristic information, case temperature Tc, forward voltage Vf, and forward current If, light source based on the characteristic information, case temperature Tc, forward voltage Vf, and forward current If is used.
- the “ON / Duty” of the unit 103R is calculated (step S107).
- the ON / Duty calculation unit 116 calculates “ON / Duty” of the light source unit 103R using Equation 1.
- Equation 1 the denominator “Vf ⁇ If ⁇ (1 ⁇ WPE / 100) ⁇ Rj ⁇ c” on the right side is the relationship between the LED junction temperature Tj and the case temperature Tc, and the LED junction temperature Tj and the case temperature. A difference Tj ⁇ Tc from Tc is obtained. For this reason, the ON / Duty calculation unit 116 calculates “ON / Duty” of the light source unit 103R based on the LED junction temperature Tj and the case temperature Tc. Further, the ON / Duty calculation unit 116 calculates the ratio of the difference between the maximum junction temperature Tj (max) of the LED and the case temperature Tc to the difference between the LED junction temperature Tj and the case temperature Tc as “ON / Duty”. "
- the ON / Duty calculation unit 116 When the “ON / Duty” of the light source unit 103R is calculated, the ON / Duty calculation unit 116 outputs the “ON / Duty” to the adjustment unit 117. Upon receiving “ON / Duty”, the adjustment unit 117 determines whether or not the “ON / Duty” is included in the first allowable range (e1 ⁇ ON ⁇ Duty ⁇ 100%) (step S108). Note that the lower limit e1 of the first allowable range is a positive value smaller than 100%.
- the adjustment unit 117 ends the light source control process.
- the adjustment unit 117 determines whether “ON ⁇ Duty” is smaller than the lower limit value e1 of the first allowable range (step S109). ).
- the adjusting unit 117 determines that the junction temperature Tj is too high, and outputs a light source control signal indicating the “ON ⁇ Duty” to the light source driving unit 109R. As a result, the adjustment unit 117 changes the duty ratio of the light source unit 103R to “ON / Duty” calculated in step S108. For this reason, the adjustment unit 117 lowers the brightness of the light source unit 103R, and can reduce the heat generation amount of the light source unit 103R (step S110).
- the adjusting unit 117 outputs a cooling control signal indicating a cooling input power larger than the predetermined cooling input power to the cooling drive unit 108R to increase the cooling input power. Thereby, the adjustment part 117 can raise the cooling power of the cooling part 107R (step S111).
- the adjustment unit 117 returns to step S105 and calculates “ON / Duty” of the light source unit 103R again. If the calculated “ON / Duty” is included in the first allowable range in step S108, the light source control process ends.
- Step S109 when it is determined that “ON ⁇ Duty” is larger than the lower limit value e1 of the first allowable range, the adjustment unit 117 sets “ON ⁇ Duty” to the upper limit value “100 of the first allowable range. It is determined that it is larger than “%”, and a cooling control signal indicating a cooling input power smaller than the predetermined cooling input power is output to the cooling drive unit 108R. Thereby, the adjustment unit 117 decreases the cooling input power, and can reduce the cooling power of the cooling unit 107R (step S112).
- step S105 When the cooling input power decreases, the case temperature Tc of the light source unit 103R increases. Therefore, the adjustment unit 117 returns to step S105 to set “ON / Duty” of the light source unit 103R to 100%, and then in step S107, the light source unit 103R. The “ON / Duty” is calculated again. In step S108, if the calculated “ON / Duty” is included in the first allowable range, the light source control process ends.
- the adjustment unit 117 determines whether the detection result L is larger than a second threshold (hereinafter referred to as “50” for convenience) smaller than the first threshold. It is determined whether or not (step S113).
- L is an arbitrary value included in 50 to 100.
- the light source case temperature detecting unit 112R detects the case temperature Tc of the light source unit 103R and outputs it to the adjusting unit 117, and the light source forward voltage detecting unit 113R is the forward direction of the light source unit 103R.
- the voltage Vf is detected and output to the adjustment unit 117, and the light source forward current detection unit 114R detects and outputs the forward current If of the light source unit 103R (step S115).
- adjustment unit 117 Upon receiving case temperature Tc, forward voltage Vf, and forward current If, adjustment unit 117 turns on the received case temperature Tc, forward voltage Vf, forward current If, and the characteristic information read in step S102. Output to the duty calculation unit 116.
- ON / Duty calculation unit 116 When ON / Duty calculation unit 116 receives characteristic information, case temperature Tc, forward voltage Vf, and forward current If, light source based on the characteristic information, case temperature Tc, forward voltage Vf, and forward current If is used. “ON / Duty” of the unit 103R is calculated (step S116). The calculation method of “ON / Duty” is the same as the calculation method of “ON / Duty” in step S107.
- the ON / Duty calculation unit 116 When the “ON / Duty” of the light source unit 103R is calculated, the ON / Duty calculation unit 116 outputs the “ON / Duty” to the adjustment unit 117. Upon receiving “ON / Duty”, the adjustment unit 117 determines whether or not the “ON / Duty” is included in the second allowable range (e2 ⁇ ON ⁇ Duty ⁇ L%) (step S117).
- the lower limit e2 of the second allowable range is a positive value smaller than L%.
- the adjustment unit 117 ends the light source control process.
- the adjustment unit 117 determines whether “ON ⁇ Duty” is smaller than the lower limit value e2 of the second allowable range (step S118). ).
- the adjusting unit 117 determines that the junction temperature Tj is too high, and outputs a light source control signal indicating the “ON ⁇ Duty” to the light source driving unit 109R. As a result, the adjustment unit 117 changes the duty ratio of the light source unit 103R to “ON / Duty” calculated in step S116 (step S119).
- the adjustment unit 117 outputs a cooling control signal indicating a cooling input power larger than the predetermined cooling input power to the cooling drive unit 108R to increase the cooling input power (step S120).
- step S117 When the cooling input power is increased, the case temperature Tc of the light source unit 103R is decreased. Therefore, the adjustment unit 117 returns to step S114 and calculates “ON / Duty” of the light source unit 103R again. If the calculated “ON / Duty” is included in the second allowable range in step S117, the light source control process ends.
- step S118 If it is determined in step S118 that “ON ⁇ Duty” is larger than the lower limit value e2 of the second allowable range, the adjustment unit 117 sets “ON ⁇ Duty” to the upper limit value “L” of the second allowable range. It is determined that it is larger than “%”, and a cooling control signal indicating a cooling input power smaller than the predetermined cooling input power is output to the cooling drive unit 108R. Thereby, the adjustment unit 117 decreases the cooling input power, and can reduce the cooling power of the cooling unit 107R (step S121).
- step S114 When the cooling input power decreases, the case temperature Tc of the light source unit 103R increases. Therefore, the adjustment unit 117 returns to step S114 to set “ON / Duty” of the light source unit 103R to L%, and then in step S116, the light source unit 103R. The “ON / Duty” is calculated again. In step S117, if the calculated “ON / Duty” is included in the second allowable range, the light source control process ends.
- the light source case temperature detecting unit 112R detects the case temperature Tc of the light source unit 103R and outputs it to the adjusting unit 117, and the light source forward voltage detecting unit 113R is the forward direction of the light source unit 103R.
- the voltage Vf is detected and output to the adjustment unit 117, and the light source forward current detection unit 114R detects and outputs the forward current If of the light source unit 103R (step S123).
- adjustment unit 117 Upon receiving case temperature Tc, forward voltage Vf, and forward current If, adjustment unit 117 turns on the received case temperature Tc, forward voltage Vf, forward current If, and the characteristic information read in step S102. Output to the duty calculation unit 116.
- ON / Duty calculation unit 116 When ON / Duty calculation unit 116 receives characteristic information, case temperature Tc, forward voltage Vf, and forward current If, light source based on the characteristic information, case temperature Tc, forward voltage Vf, and forward current If is used.
- the “ON / Duty” of the unit 103R is calculated (step S124).
- the calculation method of “ON / Duty” is the same as the calculation method in step S107.
- the ON / Duty calculation unit 116 When the “ON / Duty” of the light source unit 103R is calculated, the ON / Duty calculation unit 116 outputs the “ON / Duty” to the adjustment unit 117. Upon receiving “ON / Duty”, the adjustment unit 117 determines whether or not the “ON / Duty” is included in a preset third allowable range (e3 ⁇ ON ⁇ Duty ⁇ 50%) ( Step S125). Note that the lower limit value e3 of the third allowable range is a positive value smaller than 50%.
- the adjustment unit 117 ends the light source control process.
- the adjustment unit 117 determines whether “ON ⁇ Duty” is smaller than the lower limit value e3 of the third allowable range (step S126). ).
- the adjusting unit 117 determines that the junction temperature Tj is too high, and outputs a light source control signal indicating the “ON ⁇ Duty” to the light source driving unit 109R. As a result, the adjustment unit 117 changes the duty ratio of the light source unit 103R to “ON / Duty” calculated in step S124 (step S127).
- the adjustment unit 117 outputs a cooling control signal indicating a cooling input power larger than the predetermined cooling input power to the cooling drive unit 108R to increase the cooling input power (step S128).
- step S125 if the calculated “ON / Duty” is included in the third allowable range, the light source control process ends.
- step S126 If it is determined in step S126 that “ON ⁇ Duty” is greater than the lower limit value e3 of the third allowable range, the adjustment unit 117 sets “ON ⁇ Duty” to the upper limit value “50 of the third allowable range. It is determined that it is larger than “%”, and a cooling control signal indicating a cooling input power smaller than the predetermined cooling input power is output to the cooling drive unit 108R. Thereby, the adjustment unit 117 decreases the cooling input power, and can reduce the cooling power of the cooling unit 107R (step S129).
- step S122 When the cooling input power decreases, the case temperature Tc of the light source unit 103R increases. Therefore, the adjustment unit 117 returns to step S122 to set “ON / Duty” of the light source unit 103R to 50%, and then in step S124, the light source unit 103R. The “ON / Duty” is calculated again. In step S125, if the calculated “ON / Duty” is included in the third allowable range, the light source control process ends.
- the red LED, the green LED, and the blue LED used in each of the light source units 103R, 103G, and 103B have the characteristics (maximum junction temperature Tj (max), power conversion efficiency WPE, and LED) shown in FIG. It is assumed that a thermal resistance Rj-c) between the junction and the LED case is provided.
- the Peltier elements used in 107R, 107G, and 107B in each cooling unit are assumed to have the characteristics shown in FIGS.
- FIG. 8 shows an endothermic characteristic showing the relationship between the current I of the Peltier element and the endothermic amount Qc when the temperature on the heat dissipation side is 50 ° C.
- FIG. 9 shows the Peltier element when the temperature on the heat dissipation side is 50 ° C.
- the current-voltage characteristic showing the relationship between the current I and the voltage V is shown.
- FIG. 10 shows the time change of the junction temperature Tj of the light source unit 103R, the time change of the case temperature Tc of the light source unit 103R, and the cooling unit 107R when the projection display apparatus 100 performs the above processing. It is a figure which shows the time change of cooling input electric power.
- the maximum case temperature which is the case temperature Tc at which the joint temperature Tj becomes the maximum joint temperature Tj (max), is as follows.
- Input power of Peltier element 128W ⁇ 7.5A ⁇ 17V
- the forward voltage Vf of the light source unit 103R is set to 3.5V
- the forward current If of the light source unit 103R is set to 30A.
- the maximum case temperature of the light source unit 103R is as follows.
- Maximum case temperature 65 ° C ⁇ 110 ° C-3.5V x 30A x 0.5 x (1-0.15) x 1
- the input power of the Peltier element necessary for maintaining the case temperature Tc at the maximum case temperature “65 ° C.” is as follows.
- the cooling input power of the projection display device 200 shown in FIG. 1 is evaluated.
- each LED of the projection display apparatus 200 has the characteristics shown in FIG. 7 in the same manner as each LED of the projection display apparatus 100 shown in FIG.
- the Peltier element used in each of the cooling units 205R, 205G, and 205B of the projection display apparatus 200 has the characteristics shown in FIGS. 8 and 9 in the same manner as the Peltier element of the projection display apparatus 100 shown in FIG. Shall have.
- FIG. 11 shows the time change of the junction temperature Tj of the light source unit 204R, the time change of the case temperature Tc of the light source unit 204R, and the cooling unit 205R when the projection display apparatus 200 performs the above processing. It is a figure which shows the time change of cooling input electric power.
- the detection result L of the optical sensor 202 is L> 100.
- the detection result L of the optical sensor 202 is L ⁇ 50, it is larger than that of the projection display apparatus 100 of the present embodiment.
- the cooling unit 107R cools the light source unit 103R.
- the optical sensor 111 detects ambient brightness.
- the light source case temperature detection unit 112R detects a case temperature that is the temperature of the case of the light source unit 103R.
- the light source forward voltage detection unit 113R detects the forward voltage of the light source unit 103R.
- the light source forward current detection unit 114R detects the forward current of the light source unit 103R.
- the adjusting unit 117 adjusts the brightness of the light source unit 103R based on the ambient brightness, and adjusts the cooling power of the cooling unit 107R based on the forward voltage, the forward current, and the case temperature.
- the cooling power is adjusted based on the forward voltage, forward current and case temperature. Since the light source input power W can be grasped from the forward voltage and the forward current, even when the light source input power is adjusted, the power required for cooling the LED can be set to an appropriate value.
- the illustrated configuration is merely an example, and the present invention is not limited to the configuration.
- each of the cooling units 107R, 107G, and 107B is configured by a Peltier element, but can be configured by a cooling element other than the Peltier element as long as the cooling power can be adjusted according to the input power.
- DESCRIPTION OF SYMBOLS 100 Projection type display apparatus 101 Image signal processing part 102 Spatial light modulation signal generation part 103R, 103G, and 103B Light source part 104R, 104G, and 104B Spatial light modulation element 105 Cross dichroic prism 106 Projection lens 107R, 107G, and 107B Cooling part 108R, 108G And 108B Cooling drive unit 109R, 109G and 109B Light source drive unit 110 Optical sensor drive unit 111 Optical sensor 112R, 112G and 112B Light source case temperature detection unit 113R, 113G and 113B Light source forward voltage detection unit 114R, 114G and 114B Light source forward direction Current detection unit 115 Storage unit 116 ON / Duty calculation unit 117 Adjustment unit
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Abstract
Description
赤色LEDの最大ケース温度=20℃≒110℃-300W×0.35×(1-0.15)×1℃/W
緑色LEDの最大ケース温度=40℃≒170℃-300W×0.45×(1-0.05)×1℃/W
青色LEDの最大ケース温度=115℃≒170℃-300W×0.2×(1-0.1)×1℃/W
また、ケース温度Tcを最大ケース温度「20℃」に維持するために必要なペルチェ素子の投入電力は、例えば、赤色LED用のペルチェ素子の場合、以下のようになる。
ペルチェ素子の投入電力=128W≒7.5A×17V
また、調節部117が、光源部103Rをデューティ比=50%のパルス電圧で点灯させた場合、光源部103Rの順方向電圧Vfを3.5Vとし、光源部103Rの順方向電流Ifを30Aと仮定すると、光源部103Rの最大ケース温度は、以下のようになる。
最大ケース温度=65℃≒110℃-3.5V×30A×0.5×(1-0.15)×1
また、ケース温度Tcを最大ケース温度「65℃」に維持するために必要なペルチェ素子の投入電力は、例えば、赤色LED用のペルチェ素子の場合、以下のようになる。
ペルチェ素子の投入電力=4.5W=1.5A×3V
次に、図1で示した投写型表示装置200の冷却投入電力を評価する。
ペルチェ素子の投入電力=60W=5A×12V
したがって、図1で示した投写型表示装置200におけるペルチャ素子の投入電力は、光センサ202の検出結果LがL>100の場合には、本実施形態の投写型表示装置100と同様であるが、光センサ202の検出結果LがL<50の場合は、本実施形態の投写型表示装置100よりも大きくなっている。
101 画像信号処理部
102 空間光変調信号生成部
103R、103Gおよび103B 光源部
104R、104Gおよび104B 空間光変調素子
105 クロスダイクロイックプリズム
106 投写レンズ
107R、107Gおよび107B 冷却部
108R、108Gおよび108B 冷却駆動部
109R、109Gおよび109B 光源駆動部
110 光センサ駆動部
111 光センサ
112R、112Gおよび112B 光源ケース温度検出部
113R、113Gおよび113B 光源順方向電圧検出部
114R、114Gおよび114B 光源順方向電流検出部
115 記憶部
116 ON・Duty算出部
117 調節部
Claims (5)
- LEDからの光を投写して画像を表示する投写型表示装置であって、
前記LEDを冷却する冷却部と、
周囲の明るさを検出する光検出部と、
前記LEDの順方向電圧を検出する電圧検出部と、
前記LEDの順方向電流を検出する電流検出部と、
前記LEDのケースの温度であるケース温度を検出する温度検出部と、
前記周囲の明るさに基づいて前記LEDの明るさを調節するとともに、前記順方向電圧、前記順方向電流および前記ケース温度に基づいて前記冷却部の冷却力を調節する制御部と、を有する投写型表示装置。 - 請求項1に記載の投写型表示装置において、
前記制御部は、前記順方向電圧、前記順方向電流および前記温度に基づいて、前記LEDの接合部温度と前記ケース温度との差分に対する、予め定められた最大接合部温度と前記ケース温度との差分の比率を算出し、当該比率に基づいて前記冷却部の冷却力を調節する、投写型表示装置。 - 請求項2に記載の投写型表示装置において、
前記制御部は、前記比率が前記LEDの明るさに応じて定められる許容範囲の上限値より大きい場合、前記冷却力を下げ、前記比率が前記許容範囲の下限値より小さい場合、前記冷却力を上げる、投写型表示装置。 - 請求項3に記載の投写型表示装置において、
前記制御部は、前記比率が前記下限値より小さい場合、当該比率に応じて前記LEDの明るさを調節する、投写型表示装置。 - LEDからの光を投写して画像を表示する投写型表示装置の光源冷却方法であって、
周囲の明るさを検出し、
前記LEDの順方向電圧を検出し、
前記LEDの順方向電流を検出し、
前記LEDのケースの温度であるケース温度を検出し、
前記周囲の明るさに基づいて前記LEDの明るさを調節し、
前記順方向電圧、前記順方向電流および前記ケース温度に応じた冷却力で前記LEDを冷却する、光源冷却方法。
Priority Applications (4)
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PCT/JP2010/063022 WO2012017511A1 (ja) | 2010-08-02 | 2010-08-02 | 投写型表示装置および光源冷却方法 |
CN201080068412.9A CN103052913B (zh) | 2010-08-02 | 2010-08-02 | 投影型显示装置以及冷却光源的方法 |
JP2012527484A JP5495348B2 (ja) | 2010-08-02 | 2010-08-02 | 投写型表示装置および光源冷却方法 |
US13/813,404 US9223193B2 (en) | 2010-08-02 | 2010-08-02 | Projection type display apparatus and method of cooling light source |
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PCT/JP2010/063022 WO2012017511A1 (ja) | 2010-08-02 | 2010-08-02 | 投写型表示装置および光源冷却方法 |
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JP (1) | JP5495348B2 (ja) |
CN (1) | CN103052913B (ja) |
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US9501174B2 (en) * | 2015-04-10 | 2016-11-22 | Apple Inc. | Temperature sensing display assemblies |
EP3655818B1 (en) * | 2017-07-21 | 2021-12-15 | Lumileds LLC | Method of controlling a segmented flash system |
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US7460179B2 (en) * | 2002-01-31 | 2008-12-02 | Hewlett-Packard Development Company, L.P. | Adaptive image display |
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JP4107266B2 (ja) * | 2004-06-11 | 2008-06-25 | セイコーエプソン株式会社 | 表示装置及びその調光方法 |
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2010
- 2010-08-02 US US13/813,404 patent/US9223193B2/en active Active
- 2010-08-02 CN CN201080068412.9A patent/CN103052913B/zh active Active
- 2010-08-02 WO PCT/JP2010/063022 patent/WO2012017511A1/ja active Application Filing
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CN103052913B (zh) | 2015-05-20 |
JPWO2012017511A1 (ja) | 2013-09-19 |
US9223193B2 (en) | 2015-12-29 |
JP5495348B2 (ja) | 2014-05-21 |
CN103052913A (zh) | 2013-04-17 |
US20130128236A1 (en) | 2013-05-23 |
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