White light source device and color temperature adjusting method thereof

Abstract

The invention discloses a white light source device and a color temperature adjusting method thereof. The device comprises a white light source, a first cholesteric phase liquid crystal layer arrangedon the light emitting side of the white light source, a second cholesteric phase liquid crystal layer arranged on one side of the first cholesteric phase liquid crystal layer, facing away from the white light source, a first liquid crystal box arranged on one side of the second cholesteric phase liquid crystal layer, facing away from the first cholesteric phase liquid crystal layer, a second liquid crystal box arranged on one side of the first liquid crystal box, facing away from the second cholesteric phase liquid crystal layer, and a linear polarizer arranged on one side of the second liquid crystal box, facing away from the first liquid crystal box. By using the structure matched by the cholesteric phase liquid crystal layers, the liquid crystal boxes, and the linear polarizer, the polarization states of the emergent light of the two cholesteric phase liquid crystal layers are respectively controlled through the two liquid crystal boxes, the light with different polarization statesproduces the light emission rates with different degrees when the light irritates the linear polarizer, then, the emission rates of the yellow light and blue light are controlled in different degrees, and finally, the control of the color temperature of the emitted light of the white light source device can be achieved.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a white light source device and a method for adjusting its color temperature Background technique [0002] At present, white light sources are widely used in all aspects of life. With the continuous development of organic light emitting diode (Light Emitting Diode, LED) technology, LED light sources have gradually replaced incandescent lamps and halogen lamps as mainstream lighting devices. In recent years, smart lighting equipment has become a hot topic in next-generation lighting technology, and a key point of this technology is real-time spectrum adjustment. The adjustment of the spectrum means the change of the color temperature, so that the adjustable white light is suitable for various external environments. For example, the color temperature can be adjusted adaptively as the weather, temperature, and external light intensity change. It can be widely used in indoo...

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Problems solved by technology

[0003] However, after the current white light source is formed, its color temperature is basically fixed, and it is impossible to adjust the color temperature in a wide range.

For example, after the traditional white LED leaves the factory, its color temperature is basically fixed. If you want to adjust its color temperature, you can only change the color temperature by adding light-emitting chips or driving circuits. Building a complete driving circuit will also reduce the excitation efficiency of fluorescence, and the production cost is high

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