Optical path control device, display device, and optical path control method

Abstract

To provide an optical path control device, a display device and an optical path control method, in which the power consumption of an actuator is reduced and the control of the actuator is simplified.SOLUTION: The optical path control device comprises: a swing unit that includes an optical unit which light enters, a first swing unit for supporting the optical unit, and a second swing unit for swingably supporting the first swing unit; a first actuator for causing the swing unit to swing around a first swing shaft; a second actuator for swinging the swing unit around a second swing shaft that intersects the first swing shaft; and a drive unit for applying a drive signal of current value to the first and second actuators. When applying a drive signal consisting of a prescribed current value the current value of which is preliminarily set to one of the first and second actuators and maintaining the first or second swing unit at a tilt position inclined with respect to a reference position, the drive unit applies a drive signal consisting a zero current value to the other of the first and second actuators so as to maintain the first or second swing unit at the reference position.SELECTED DRAWING: Figure 3

Claims

1. A rocking part having an optical part into which light is incident, a first rocking part that supports the optical part, and a second rocking part that rocks freely and supports the first rocking part, A first actuator that causes the aforementioned oscillating part to oscillate around a first oscillating axis, A second actuator that causes the aforementioned oscillating part to oscillate around a second oscillating axis that intersects the first oscillating axis, A drive unit that applies a drive signal of current value to the first actuator and the second actuator, Equipped with, The aforementioned drive unit is During the period in which a drive signal of a second current value is applied to the first actuator for a first predetermined period, and then a drive signal of a first current value is applied to maintain the first oscillating part in an inclined position relative to the reference position, a drive signal of a third current value is applied to the second actuator for a second predetermined period, and then a drive signal of zero current value is applied to maintain the second oscillating part in the reference position. During the period in which a drive signal of the second current value is applied to the first actuator for a predetermined period of time, followed by a drive signal that sets the current value to 0, the second actuator is subjected to a drive signal of the second current value for a predetermined period of time, followed by a drive signal of the first current value, to maintain the second oscillating part in an inclined position relative to the reference position. The first predetermined period is approximately the same value as half of the natural period, which is the reciprocal of the natural frequency of the first oscillating part, and the second predetermined period is approximately the same value as half of the natural period, which is the reciprocal of the natural frequency of the second oscillating part. Optical path control device.

2. The first and second pivot axes are arranged to be orthogonal to each other and are also positioned at a 45-degree angle with respect to the pixel arrangement direction of the optical unit. The optical path control device according to claim 1.

3. The drive signal of the current value applied by the drive unit to the first actuator and the second actuator has a stepped waveform. The optical path control device according to claim 1 or claim 2.

4. The optical path control device according to claim 1, An illumination device for irradiating the optical part with light, A display device equipped with the following features.

5. An optical path control method for controlling an optical path by applying a drive signal of current value to a first actuator that swings a first oscillating part, which supports an optical part into which light is incident, around a first oscillating axis, and a second actuator that swings a second oscillating part, which pivotably supports the first oscillating part, around a second oscillating axis that intersects the first oscillating axis, wherein the optical path is controlled by applying a drive signal of current value to these two actuators. During the period in which a drive signal of a second current value is applied to the first actuator for a first predetermined period, and then a drive signal of a first current value is applied to maintain the first oscillating part in an inclined position relative to the reference position, a drive signal of a third current value is applied to the second actuator for a second predetermined period, and then a drive signal of zero current value is applied to maintain the second oscillating part in the reference position. During the period in which a drive signal of the second current value is applied to the first actuator for a predetermined period of time, followed by a drive signal that sets the current value to 0, the second actuator is subjected to a drive signal of the second current value for a predetermined period of time, followed by a drive signal of the first current value, to maintain the second oscillating part in an inclined position relative to the reference position. The first predetermined period is approximately the same value as half of the natural period, which is the reciprocal of the natural frequency of the first oscillating part, and the second predetermined period is approximately the same value as half of the natural period, which is the reciprocal of the natural frequency of the second oscillating part. Optical path control method.

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