Light source module and lighting control method

Abstract

The invention discloses a light source module and a lighting control method. The light source module comprises a plurality of lighting devices and emits light periodically according to a period. The period includes a plurality of intervals corresponding to the lighting devices respectively. The lighting control method includes the steps: driving each lighting device to emit light under an individual main power in the corresponding interval; driving each lighting device to emit light in other intervals, except the corresponding interval of the period, under corresponding auxiliary powers. The corresponding auxiliary powers are lower than the individual main power of the corresponding lighting device in the certain interval; a quotient obtained by dividing the individual main power of the corresponding lighting device in the certain interval by the corresponding auxiliary powers is not larger than a corresponding limit value.

Description

Technical field [0001] The present invention relates to a light source module and its light emission control method, in particular to a light source module and its light emission control method that can be used in a projector to emit light periodically. Background technique [0002] At present, projectors mostly use light-emitting diodes (LEDs) as light sources, but due to the material properties of LEDs, their luminous brightness will attenuate with increasing use time, causing color variations in the projected image. At this time, the input current to the LED can be increased to compensate for the attenuation of the luminous brightness. However, generally speaking, the higher the input current, the more heat the LED generates during operation, making it difficult to suppress the temperature of the contact point, thereby reducing the service life. Therefore, the aforementioned method of increasing the input current will shorten the service life of the LED and emit light. The ef...

AI Technical Summary

Problems solved by technology

If the input current is to be avoided from increasing excessively, the luminous brightness compensation effect is limited

In addition, if the light source module of the projector uses different LEDs to provide different colors of light, the attenuation of LEDs of different colors is also different, so the degree of current increase required is also different.

Although the brightness compensation method mentioned above can be adjusted independently for each color LED, it is not easy to maintain the adjusted brightness ratio of each color LED, especially to avoid excessive increase of input current, the adjusted brightness of each color LED may not be able to Fully compensated, this will make the brightness ratio of each color LED after adjustment different from the ratio before adjustment, resulting in color distortion of the projected image

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