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Driving device, light-emitting device, projection device and control method

A technology of a driving device and a control method, which is applied in the direction of lighting devices, electroluminescent light sources, output power conversion devices, etc., and can solve problems such as the drop in the output voltage value of a DC/DC converter

Active Publication Date: 2015-03-18
CASIO COMPUTER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the technology described in Japanese Patent Application Laid-Open No. 2008-234842, when the blue light-emitting diode or the red light-emitting diode starts to emit light, the output voltage value of the DC / DC converter drops.

Method used

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  • Driving device, light-emitting device, projection device and control method
  • Driving device, light-emitting device, projection device and control method
  • Driving device, light-emitting device, projection device and control method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach 〕

[0022] figure 1 is a block diagram of the drive device 10 for the load 2 .

[0023] The drive device 10 drives the load 2 . The load 2 is a light source (a semiconductor light emitting element (for example, a light emitting diode, a laser diode, an organic light emitting diode, or an organic EL element, etc.), an incandescent lamp or a discharge lamp, etc.), a resistor, a heater, or a motor.

[0024] If the load 2 is a light source, the device including the driving device 10 and the load 2 is a light emitting device.

[0025] In this case, it is also possible to install the light emitting device in a projection device, and use the load 2 as a light source as a light source of the projection device.

[0026] The projection device also has a spatial light modulator (such as a liquid crystal shutter array panel, a digital micromirror device), the light emitted by the load 2 as a light source is irradiated to the spatial light modulator through various optical devices, and the ...

no. 2 Embodiment approach 〕

[0131] The driving device according to the second embodiment has the driving device 10 related to the first embodiment (refer to figure 1 ) The same circuit configuration.

[0132] The driving device of the second embodiment differs from the driving device 10 of the first embodiment in the program 12a and the operation of the arithmetic processing device 11 based on the program 12a.

[0133] Therefore, descriptions of common points between the drive device of the second embodiment and the drive device 10 of the first embodiment will be omitted, and differences will be mainly described below.

[0134] Also, as in the case of the first embodiment, if the load 2 is a light source, the device including the driving device and the load 2 of the second embodiment is a light emitting device, and this light emitting device can be used in a projection device.

[0135] image 3 It is a timing chart showing changes in the levels of the signals Sa, S1, S2, S3, and S4 output from the arit...

no. 3 Embodiment approach 〕

[0179] Figure 4 It is a block diagram of a drive device 10B according to the third embodiment.

[0180] The same reference numerals are assigned to the same components of the driving device 10B of the third embodiment and the driving device 10 of the first embodiment, and the description of the common points between the driving device of the third embodiment and the driving device 10 of the first embodiment will be omitted. , the following mainly explains the differences.

[0181] The drive device 10 of the first embodiment drives one load 2 .

[0182] In contrast, the drive device 10B of the third embodiment drives three loads 2a, 2b, and 2c.

[0183] In addition, the driving device 10 of the first embodiment has an OR gate 14 .

[0184] On the other hand, the driving device 10B of the third embodiment does not include the OR gate 14 .

[0185] Furthermore, the driving device 10 of the first embodiment has one switching element 18 .

[0186] On the other hand, the drivi...

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Abstract

A driving device is provided with: a power circuit in which it is possible to modify an output current value of an output terminal configured to have a load connected thereto; an output capacitor connected between the output terminal of the power circuit and a reference potential node; a switching element connected between the output terminal of the power circuit and the reference potential node; and a control unit that controls the output current value of the power circuit. The control unit turns the switching element ON and OFF and controls the output current value of the power circuit during a period in which the switching element is ON such that the voltage of the output terminal of the power circuit during this period is equal to or lower than the voltage applied to the load during a period when this load is OFF.

Description

technical field [0001] The invention relates to a driving device, a light emitting device, a projection device and a control method. Background technique [0002] Japanese Patent Application Laid-Open No. 2008-234842 discloses a time division system (field sequential system) projection device. [0003] A time-division projection device projects a color image by sequentially and repeatedly irradiating red light, green light, and blue light onto a display element. [0004] In particular, the projection device described in Japanese Patent Application Laid-Open No. 2008-234842 sequentially and repeatedly lights up a red light emitting diode, a green light emitting diode, and a blue light emitting diode through a single DC / DC converter. [0005] Because the red light-emitting diode, green light-emitting diode and blue light-emitting diode have different voltage values ​​when they are lit, and these light-emitting diodes are sequentially illuminated by a DC / DC converter, the outp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH02M1/32H02M3/158H05B33/0815H05B45/375H05B45/38
Inventor 滨中秀雄
Owner CASIO COMPUTER CO LTD