Light source module, projector using same and light source control method thereof
阅读说明:本技术 光源模组、应用其的投影机及其光源控制方法 (Light source module, projector using same and light source control method thereof ) 是由 林建宏 徐子桓 于 2019-10-11 设计创作,主要内容包括:本发明提供一种光源模组,该光源模组包括:激光光源;温度感应器,邻近该光源配置且用以感应该激光光源的光源温度;光源驱动器;以及控制器,该控制器用以判断该光源温度是否达到第一温度值;当该光源温度达到该第一温度值,控制该光源驱动器以第一电流驱动该激光光源发光;判断该光源温度是否从该第一温度值变换到第二温度值,该第二温度值与该第一温度值相异;及当该光源温度从该第一温度值变换到该第二温度值,控制该光源驱动器以第二电流驱动该激光光源发光,该第二电流与该第一电流的电流值相异。本发明可依据光源温度分段式地控制驱动电流的高低,从而使其符合多种不同种类的激光光源的不同驱动特性。(The invention provides a light source module, which comprises: a laser light source; a temperature sensor disposed adjacent to the light source and configured to sense a light source temperature of the laser light source; a light source driver; the controller is used for judging whether the temperature of the light source reaches a first temperature value or not; when the temperature of the light source reaches the first temperature value, controlling the light source driver to drive the laser light source to emit light by first current; judging whether the temperature of the light source is converted from the first temperature value to a second temperature value, wherein the second temperature value is different from the first temperature value; and when the temperature of the light source is converted from the first temperature value to the second temperature value, controlling the light source driver to drive the laser light source to emit light by a second current, wherein the current value of the second current is different from that of the first current. The invention can control the drive current according to the temperature of the light source in a sectional mode, thereby enabling the drive current to be in line with different drive characteristics of various laser light sources.)
1. A light source module, comprising:
a laser light source;
a temperature sensor disposed adjacent to the light source and configured to sense a light source temperature of the laser light source;
a light source driver; and
a controller to:
judging whether the temperature of the light source reaches a first temperature value;
when the temperature of the light source reaches the first temperature value, controlling the light source driver to drive the laser light source to emit light by first current;
judging whether the temperature of the light source is converted from the first temperature value to a second temperature value, wherein the second temperature value is different from the first temperature value; and
when the light source temperature is converted from the first temperature value to the second temperature value, the light source driver is controlled to drive the laser light source to emit light by a second current, and the current value of the second current is different from that of the first current.
2. The light source module as claimed in claim 1, wherein the temperature sensor contacts the laser source.
3. The light source module as claimed in claim 1, wherein the second temperature value is greater than the first temperature value; the step of determining whether the light source temperature is transformed from the first temperature value to the second temperature value further includes:
judging whether the second temperature value is lower than a critical temperature value; and
when the second temperature value is lower than the critical temperature value; and driving the laser light source to emit light by the second current which is larger than the first current.
4. The light source module as claimed in claim 1, wherein the second temperature value is greater than the first temperature value; the step of determining whether the light source temperature is transformed from the first temperature value to the second temperature value further includes:
judging whether the second temperature value reaches a critical temperature value; and
when the second temperature value reaches the critical temperature value; and driving the laser light source to emit light by the second current equal to the highest current value.
5. The light source module as claimed in claim 1, wherein the second temperature value is greater than the first temperature value; the step of determining whether the light source temperature is transformed from the first temperature value to the second temperature value further includes:
judging whether the second temperature value is higher than a critical temperature value; and
when the second temperature value is higher than the critical temperature value; and driving the laser light source to emit light by the second current which is equal to or less than the first current.
6. The light source module as claimed in claim 1, wherein the laser source has a threshold temperature, and the first temperature and the second temperature are both lower than the threshold temperature.
7. The light source module as claimed in claim 1, wherein the laser source is a monochromatic laser source.
8. The light source module as claimed in claim 7, wherein the wavelength of the light emitted from the laser source is 620 nm-750 nm.
9. A projector, characterized in that the projector comprises:
a projection module; and
the light source module of any one of claims 1 to 8, wherein the light source module is used for emitting light to the projection module.
10. A light source control method, comprising:
detecting the light source temperature of the laser light source;
judging whether the temperature of the light source reaches a first temperature value;
when the temperature of the light source reaches the first temperature value, controlling a light source driver to drive the laser light source to emit light by first current;
judging whether the temperature of the light source is converted from the first temperature value to a second temperature value, wherein the second temperature value is different from the first temperature value; and
when the light source temperature is converted from the first temperature value to the second temperature value, the light source driver is controlled to drive the laser light source to emit light by a second current, and the current value of the second current is different from that of the first current.
Technical Field
The present invention relates to a light source module, a projector using the same, and a light source control method thereof, and more particularly, to a light source module having a laser light source, a projector using the same, and a light source control method thereof.
Background
The conventional light source has an allowable maximum driving current, and as long as the driving current of the light source during operation is not higher than the allowable maximum driving current, the light source can have normal operation and expected life. Therefore, in general, the driving current is directly set to the maximum allowable driving current during operation of the light source, and the driving current continuously increases until the maximum allowable driving current. However, this approach cannot be applied to all light sources.
Therefore, it is necessary to design a novel light source module, a projector using the same, and a light source control method thereof to overcome the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to provide a light source module, a projector using the same and a light source control method thereof, which can control the height of a driving current in a sectional mode according to the temperature of a light source.
In order to achieve the above object, the present invention provides a light source module, which includes: a laser light source; a temperature sensor disposed adjacent to the light source and configured to sense a light source temperature of the laser light source; a light source driver; the controller is used for judging whether the temperature of the light source reaches a first temperature value or not; when the temperature of the light source reaches the first temperature value, controlling the light source driver to drive the laser light source to emit light by first current; judging whether the temperature of the light source is converted from the first temperature value to a second temperature value, wherein the second temperature value is different from the first temperature value; and when the temperature of the light source is converted from the first temperature value to the second temperature value, controlling the light source driver to drive the laser light source to emit light by a second current, wherein the current value of the second current is different from that of the first current.
Preferably, the temperature sensor is in contact with the laser light source.
Preferably, the second temperature value is greater than the first temperature value; the step of determining whether the light source temperature is transformed from the first temperature value to the second temperature value further includes: judging whether the second temperature value is lower than a critical temperature value; and when the second temperature value is lower than the critical temperature value; and driving the laser light source to emit light by the second current which is larger than the first current.
Preferably, the second temperature value is greater than the first temperature value; the step of determining whether the light source temperature is transformed from the first temperature value to the second temperature value further includes: judging whether the second temperature value reaches a critical temperature value; and when the second temperature value reaches the critical temperature value; and driving the laser light source to emit light by the second current equal to the highest current value.
Preferably, the second temperature value is greater than the first temperature value; the step of determining whether the light source temperature is transformed from the first temperature value to the second temperature value further includes: judging whether the second temperature value is higher than a critical temperature value; and when the second temperature value is higher than the critical temperature value; and driving the laser light source to emit light by the second current which is equal to or less than the first current.
Preferably, the laser source has a threshold temperature value, and the first temperature value and the second temperature value are both lower than the threshold temperature value.
Preferably, the laser source is a monochromatic laser source.
Preferably, the wavelength of the light emitted by the laser light source is between 620 nm and 750 nm.
Based on the light source module provided by the above embodiment, the present invention further provides a projector, including: the projection module comprises a projection module and the light source module, wherein the light source module is used for emitting light to the projection module.
In addition, the invention also provides a light source control method, which comprises the following steps: detecting the light source temperature of the laser light source; judging whether the temperature of the light source reaches a first temperature value; when the temperature of the light source reaches the first temperature value, controlling a light source driver to drive the laser light source to emit light by first current; judging whether the temperature of the light source is converted from the first temperature value to a second temperature value, wherein the second temperature value is different from the first temperature value; and when the temperature of the light source is converted from the first temperature value to the second temperature value, controlling the light source driver to drive the laser light source to emit light by a second current, wherein the current value of the second current is different from that of the first current.
Compared with the prior art, the light source module, the projector using the light source module and the light source control method thereof can control the height of the driving current in a sectional mode according to the temperature of the light source, so that the light source module can meet different driving characteristics of various laser light sources.
Drawings
Fig. 1 is a functional block diagram of a projector according to an embodiment of the invention;
FIG. 2 is a functional block diagram of the light source module of FIG. 1;
FIG. 3 is a characteristic curve diagram of the driving current and the operating temperature of the laser source of the light source module shown in FIG. 1;
fig. 4 is a flowchart illustrating a light source control method of the light source module shown in fig. 2.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Certain terms are used throughout the description and following claims to refer to particular components. As one of ordinary skill in the art will appreciate, manufacturers may refer to a component by different names. The present specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to.
Referring to fig. 1 and 2, fig. 1 is a functional block diagram of a
The
As shown in fig. 2, the
The
The
The
In an embodiment, the
The light source control method provided by the embodiment of the invention is suitable for laser light sources with different characteristics. The characteristics of the
Referring to fig. 3, fig. 3 is a graph illustrating a driving current versus an operating temperature of the
In addition, as shown in fig. 3, the
Referring to fig. 4, a flowchart of a light source control method of the
In step S110, the
In step S120, the
In step S130, when the light source temperature T reaches the first temperature value T1, the
In step S140, as time goes on or the
In step S141,
As shown in the proportional section TU shown in fig. 3, the driving current increases with an increase in the operating temperature. Therefore, in step S142, when the second temperature value T2 is lower than the critical temperature value TC, the
In step S143,
In step S144, since the second temperature value T2 reaches the critical temperature value TC, the
In step S145,
As shown by the inversely proportional section TD of the characteristic shown in fig. 3, the drive current decreases with increasing operating temperature. Therefore, in step S146, when the second temperature value T2 is higher than the critical temperature value TC, the
In step S146, when the second temperature value T2 reaches the limit temperature value TL, the
In addition, in an embodiment, the limit current IL is smaller than the second current I2 and the first current I1, for example, the limit current IL is the minimum value of the allowable driving currents.
Then, the process repeats the above steps to continuously monitor the operating temperature of the
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
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